Engine

What Is Fuel Injection and Why Should You Care?

January 3, 2021 by Denver Express Car Care

Just listening to modern-day advertisements for brand new cars can leave you in awe of the technology.

Or maybe a little overwhelmed.

If you’ve tried to read through all of the features, it can leave you feeling like you’re reading a futuristic sci-fi novel, trying to piece together what all of the terms mean.

It sounds impressive, but at the end of the day, you have a car in your garage, and it’s your responsibility to take care of it. That means you need to learn a little about everything, and ensure it’s all well maintained to give you top performance.

Let’s talk fuel injection

Fuel injection isn’t brand new technology. Yet it’s one of those concepts that many drivers take for granted.

Fuel injection has been around almost as long as internal combustion engines. It was initially used in WWI in aircraft engines.

Chevrolet went to market in the 1950s with a mechanical injection V8, but the electronic fuel injection used on today’s modern cars is something different completely.

Carburetors and the mechanical injection first used on the auto production line were a combination of precisely calibrated mechanical parts designed to slowly release fuel into the intake manifold. This allows an air/fuel combination to mix into the combustion chamber.

This was the most efficient fuel delivery system used for decades. They were cheap to manufacture and easy to adapt to the newest engines. They’re simple to work on, and easy to maintain. In fact, a lot of car enthusiasts prefer carburetors because they are easy to troubleshoot.

Yet as many positive features as they brought to our modern day society, they also brought something we didn’t expect: emissions. And as cars multiplied into every level of society, the air we breathe soon became too hard to ignore.

Electronics brought in today’s fuel injection

The more we moved into the technological age, the more it infiltrated our automotive industry as well.

The first electronic fuel injection system was little more than a carburetor designed with a few computer-controlled sensors. But it was a start. This transitional technology allowed manufacturers to see what was possible, and start checking off all kinds of benefits to the automotive industry. Clean up the air? Check. But it also helped with performance issues too. Like helping a car increase gas mileage, and improving the performance of the engine.

https://denverexpresscare.com/how-to-improve-fuel-economy

As with any technology, fuel injection changed gradually over time. Single port fuel injection first showed up in the 1980s. It might have looked similar to a carburetor, but it had one or two fuel injectors in the body, adding fuel to the air mix just before the intake manifold. They improved the mechanical injection process by delivering a more precise fuel delivery. Gas mileage improved, but horsepower and torque waned.

As the single injection system was replaced with multiple ports, engine lifespan also increased. A multi-port fuel injection process uses multiple ports to add fuel to the air mix. With multiple ports, it has better efficiency and performance, with less potential problems as it has more ports to rely on during the process.

A lot has changed since the 1980s. Technology has increased, computers have decreased in size, and they run faster than ever. The number of car sensors has increased, meaning it’s easier than ever for mechanics to diagnose where problems lie. Engineers have fine-tuned every part of the fuel delivery process, making today’s cars the best yet for emissions standards as well as performance.

Common fuel injector problems

If something goes wrong with your fuel injection system, your engine won’t perform the way it was intended. How do you know when something is wrong with fuel injectors?

A rough idle

If the fuel injectors aren’t releasing enough fuel, or are sending an uneven supply into the engine, the RPMs will drop below the optimal level while idling. That means a rough idle while standing still, and if it falls too low, it will actually stall out the car.

Engine vibration

If a fuel injector isn’t spraying correctly, it will cause a misfire in the corresponding cylinder. You’ll notice this as you’re driving, the engine will vibrate as it tries to complete each cycle without the proper level of fuel.

Engine misfire

If the injector is clogged, it won’t be able to spray the correct amount of fuel into the engine, causing a misfire as you drive. You’ll notice your car struggling as you accelerate. You might even notice a pause as you step on the gas pedal. Either way, this is a warning sign that the engine isn’t receiving the proper amount of fuel, and it could be at risk for overheating.

Fuel leak

Sometimes the fuel injector can crack, break, or deteriorate from old age. A small leak will release gasoline where it isn’t supposed to be. That means fuel won’t reach the engine, and it can start the process of damaging the system. You may even notice a fuel odor from the leak.

Engine surge

If the fuel injectors spray too much gas into the engine cylinder, it will cause an engine surge. This will cause your RPMs to change drastically, even when your driving is relatively stable. Your acceleration will be much slower.

Bad fuel economy

All cars originate with a fairly stable fuel economy. You can expect it to stay the same, depending on your driving habits. But if you start noticing your fuel tank draining faster, without a change in driving conditions, it could be your fuel injectors.

Check engine light

Today’s sensors are more sensitive than ever. They are designed to warn you of any potential problem within the system. The check engine light can mean an array of things, one of which could be bad fuel injectors. Never ignore a warning light. Stop in and have it checked to find where the problem lies.

Failed emissions test

Because your engine isn’t running optimally, it can increase emissions, which will be noticeable the next time your car is tested. If your car fails the emissions test, the fuel injectors are one of the first things we’ll check.

Have you noticed your vehicle isn’t running as well as it once did? Is your gas mileage slipping? Does your car have trouble running? Drive in today, and with a diagnostics test, we’ll pinpoint the problem and get you back on the road quickly. We’re here to help you keep your vehicle in tip top shape, and get you where you’re going safely.

EVAP System Leak, Now What?

December 28, 2020 by Denver Express Car Care

When you buy an automobile, you quickly learn how it operates and functions. You adjust to the noises it makes. You become attuned to the way it performs. One tiny change – a noise or a smell – will alert you to a potential problem, and give you ample time to have it fixed before the issue escalates.

Luckily, with today’s modern vehicles, it’s not just about relying on your sense of smell or hearing to detect a potential problem. Technology is now integrated into every vehicle, being the internal sight and sound that watches over everything that happens every time you start your car. Every system is calibrated to acceptable levels, and if anything moves beyond those measures, it alerts you with a tiny dashboard light.

The check engine light is one that alerts you to a variety of potential problems. Some can involve minor fixes. Some can be massive system failures – especially if you don’t fix the situation quickly.

An EVAP leak is one of those potential problems that impacts your check engine light. What is it and how do you fix it?

What is an EVAP leak?

An EVAP leak is a problem somewhere in the evaporative emission control system (EVAP). The EVAPs purpose is to contain any fumes released from gasoline, and prevent them from seeping out and impacting the environment.

The EVAP system is an important part of your vehicle’s pollution control feature, but it also serves another function: it keeps dangerous fumes from entering the cabin of your car.

How does the EVAP system work?

A vehicle’s EVAP system controls fuel vapors from escaping the fuel tank as your car sits and runs. These vapors are collected and condensed before being returned into the fuel tank. The fuel tank is a sealed system that is vacuum controlled and has purge control solenoids for the process.

As the engine runs, a vacuum is used to draw fumes into a charcoal canister where vapors are collected and condensed. As you turn the key, the engine activates a control valve which releases this vacuum into the system. The purge solenoid moves into operation and helps control the vapors, moving them back into the fuel tank.

The fuel tank has a pressure sensor to monitor this supply cycle and ensure it’s working correctly. It’s a continual process, keeping you safe while you drive, but also ensuring your car remains safe as it sits, unused.

What can go wrong with the EVAP system?

When any part of the EVAP system is compromised, it can cause a problem inside the vehicle. If a problem arises with the vacuum, solenoid, or sensor at any time, it will deliver a code to the main computer memory, alerting it to a problem within the system. It illuminates the check engine light to warn you of a potential problem.

Potential problems can include:

Gas cap failure – this is one of the most popular shortcomings, due to regular usage
Gas cap O ring is damaged
Gas tank filler tube is damaged
Vacuum feed line leaks
Vacuum control valve leaks
Vapor tube from the charcoal canister to the tank is damaged
The charcoal canister is leaking

Is it safe to drive with an EVAP leak?

While it isn’t dangerous to drive with an EVAP leak, there are several reasons why you shouldn’t.

First, it is potentially harmful to the environment. Every time you drive, your car emits exhaust fumes that contribute to the destruction of the ozone. Without the EVAP fully working, you’re emitting various levels of harmful chemicals into the world.

It also impacts your drive. While you might be able to drive your car with EVAP problems for a while, eventually, you’ll have to undergo an emissions test to update your vehicle registration. An EVAP leak will prevent you from passing this test. The longer you wait to fix the problem, the more potential damage may be done.

Finally, while the EVAP is a closed system, and won’t directly impact your health if there’s a leak in the system, it can impact other comforts of driving your car. A leak can impact the pressure in your gas tank, which can affect your mileage. It’s also something to pay attention to if you park in a closed environment.

Can you pass smog with an EVAP leak?

The short answer is: maybe. It depends on the source of the problem.

In some cases, this may be the first sign you have a problem. A negative test alerts you to the fact your car isn’t working properly.

If you do notice a check engine light before an emissions test, scheduling a maintenance visit to ensure every system on your vehicle is fully operational will help keep your car in good working condition all throughout the year.

Does EVAP system affect performance?

The EVAP charcoal canister valve – the purge solenoid – acts as a switch to move vapor into the engine. If this fails, one of the first symptoms you may notice is a rough ride. You will notice your car running inconsistently when you come to a stop, or while you’re driving at low speeds. If it sticks open, it can create a vacuum leak that impacts your idle speed. If damage to the solenoid continues, it can also lead to your engine stalling out completely.

The EVAP controls vapor. A leak within the system can impact how well your vehicle starts and stays running. Any issue with interrupted internal combustion may cause your engine to stall or refuse to start altogether.

How do you fix evaporative emission system leak detected?

One of the easiest fixes is simply to replace the gas cap. Since broken seals and a loose fit can impact how much emissions are escaping, Inspect the O ring. Because the gas cap is removed continuously when you fill up, it can stretch and loosen over time.

It may also be the vacuum feed line. This line feeds from the engine intake manifold to the EVAP system control valve. Engine heat and vibration can loosen connections or even deteriorate the rubber over time.

The main component is the charcoal canister. While it’s not something that deteriorates with regularity, it can need replacing if you’re having emissions problems.

Every system on your vehicle works to keep your car running smoothly.

Whether you have a check engine light that won’t turn off, or are noticing your car is running rougher than before, don’t wait for bigger problems to arise.

Drive in today and let us have a look.

It can be the difference between a minor repair and a major overhaul.

We’ll get you back on the road in no time.

Timing Chain or Timing Belt – How Your Car Works

December 8, 2020 by Denver Express Car Care

The heart of your vehicle is the engine. Without an engine, your car simply won’t go.

Since the very first car, the engine has been vitally important to keeping your vehicle running. Over the years, the engine has been upgraded for precision to give you the smoothest ride possible in the most efficient way. To ensure this process, it requires timing, which uses a timing chain or timing belt to work with the camshaft and crankshaft to provide motion to the pistons and valves to produce synchronicity.

Both the timing chain and timing belt are used to produce the same result. Yet they are slightly different from one another.

What is timing?

Within the engine, you have a camshaft and a crankshaft. The camshaft controls the valves that let fuel and air in and out of the engine. The crankshaft moves the pistons up and down. This process involves mechanical timing, with the synchronicity of these two movements being imperative to the engine functioning. If the timing is off, it can damage any part within the two processes – the pistons, valves, or other components of the engine.

The purpose of the timing chain or timing belt is to make this process fluid. Either of these components is used to create harmonization at a precise rate.

Timing chain or timing belt – what’s the difference?

The timing chain and timing belt function in the same way. The difference between the two is the material they are created from, and their location in the engine compartment.

Timing chains were introduced first in the production line. A timing chain is constructed of metal, and is housed within the engine compartment. It receives lubrication from engine oil, and with proper maintenance, can last for a lifetime.

Timing belts were introduced in the 1960s as we became more sophisticated with the materials we produced. Belts are made from a reinforced rubber, and are quieter and less expensive to produce. But because they are made from a softer, more flexible material, they do wear down over time, with manufacturers suggesting they be replaced every 60,000 to 100,000 miles.

Of course, modern technology keeps making improvements to the way we produce various components of a vehicle. Some manufacturers have returned to a timing chain because of the strength in metal, albeit more quiet and efficient than was used decades before.

There are strengths and weaknesses to both, so manufacturers select their final products based on the overall design of the vehicle.

The symptoms of a bad timing chain or timing belt

While a timing chain can last the lifetime of a vehicle, and a timing belt can last as long as 100,000 miles, it isn’t impossible for either component to fail. Before either completely fails, it will show warning signs along the way.

Engine misfire and poor performance

Over time, either the timing chain or timing belt can stretch, meaning it won’t be able to perform at its optimal level. As it tries to do its job, it can skip a gear on the camshaft or crankshaft as it moves as you drive. This causes the engine to fall out of calibration, and often results in an engine that misfire. You may also notice the engine jumps and runs poorly, or a lack of acceleration as you move forward down the road.

Ticking noise in the engine

The timing belt is attached by a series of pulleys that connect it to the camshaft and crankshaft. These pulleys are what help the camshaft and crankshaft function within the engine itself. As the timing belt wears down, it can produce a ticking noise in the motor due to the individual parts not being able to perform as designed.

An engine that won’t turn over

If the timing belt snaps, is broken, or no longer works, it also means your engine won’t have the neccesary power to turn over and run. When you turn the key or press the button, you’ll hear a clicking noise as the motor tries to engage. But since the timing belt is responsible for the operation of the camshaft and crankshaft, the engine won’t have a way to fully ignite.

An engine that suddenly fails

Over time, the timing belt can loosen to the point it becomes a risk underneath the hood. If it brakes while you’re driving, it snaps and begins to flail around. That’s when it has the potential for doing a lot of damage. The rubber can snap back and forth, damaging other parts such as the cylinder head hardware, including pushrods and valves. You’ll have no choice but to bring your car to a stop and have it towed into the shop.

You’ll notice metal shavings in the oil

If you’re performing regular maintenance on your vehicle, you’ll change out your motor oil every 3,000 to 5,000 miles. Oil begins to separate over time as it continually heats up and cools, and is exposed to the solvents found in today’s gasoline. If the timing chain is wearing down, flecks of metal can break away and find their way into the oil pan. A mechanic watches for these signs as he changes the oil, and alerts you to the beginning of any potential problems.

You’ll notice an oil leak

Another common sign of a problem with a timing belt is an oil leak. Pay attention to any changes in and around your vehicle, even under the hood. If an oil stain starts appearing around the engine, it might be a timing belt issue. The timing belt cover is secured by nuts and bolts, which can work their way loose over time. This can allow oil to pool out and become noticeable around the engine compartment.

The check engine light is illuminated

The check engine light can illuminate for a variety of reasons, one of which can be a problem with the timing chain or timing belt. Because the check engine light can signal a variety of issues, it’s important to have a mechanic check it out as quickly as possible to prevent further stress to your vehicle.

Whether you suspect an issue with your timing chain or timing belt, or are just in need of a reputable mechanic who will change your oil regularly, we’re here for you. Give us a call today.

All Signs Point To A Bad Alternator

November 3, 2020 by Denver Express Car Care

Today’s modern vehicle is designed with thousands of parts working together to keep you on the road. While most of us know how a few of the systems work, other parts aren’t as clear.

Tires connect to the road, keeping you comfortable and safe. A battery keeps the car running. Or does it?

A car battery is used to provide electricity to the electric starter motor designed to turn your vehicle on. But once the car is running, the power moves to the alternator, which generates energy to continually feed the electrical system while in operation.

Think of your alternator as a generator. When your vehicle is started, the engine spins wheels underneath the hood. One of those wheels is connected to the alternator, which generates energy. That energy is what keeps your electrical system running.

How do you know where the problem is with your vehicle? What are the signs of a bad alternator?

Bright or dim lights

When your electrical system isn’t getting enough current, it impacts the various accessories on your vehicle, including your lights. When you drive in the dark, is it harder to see? Does it appear your lights have dimmed? Or do they seem to be shining too brightly?

When an alternator begins to fail, it provides inconsistent voltage to the various systems in your vehicle. And that often translates to either underperforming or overperforming equipment. It’s usually most noticeable in headlights that appear either too dim or too bright. You may also experience flickering lights as you drive through the night.

Trouble starting

When you turn the key, you expect your vehicle to jump into action. If your alternator is starting to fail, that might not occur with regularity. You may have to turn the key a time or two, trying to get the engine to stay running.

For most car owners, the thought immediately turns to the battery. And while it might be the case, it’s important to consider all of the possibilities. How old is your battery? When was the last time you changed it out? Watch for other clues to determine where the problem lies.

Stalling

You may find the reverse happening too. As you drive your vehicle, stopping for lights and stop signs, you may find your car frequently stalls out.

If this happens regularly, it’s not your battery failing. Instead, it’s a sign that your vehicle’s spark plugs aren’t retaining enough power to keep your car operational. Without the flow of energy, your car simply can’t keep going.

Dead battery

There may be other times where you try to start your car and the battery is dead. You turn the key and nothing happens.

It could be just that – a dead battery. Maybe you left your light on overnight, and it drained the power from the battery. But if you’ve noticed other signs of potential problems, you might also determine it’s a sign your alternator is failing.

A bad alternator won’t charge the battery while the engine is running. That means the energy dissipates from the system quicker, preventing it from turning over when you go to start it.

A great way to test to see if it’s your battery or the alternator is to jumpstart the car. If it stays running, it’s your battery. If it dies shortly after the jump, it might be that your alternator isn’t supplying enough power to the battery.

Accessory problems

The electrical system supplies energy to many different parts of your car. It includes your power windows, your radio, your seat warmers, your windshield wipers and more. If you notice your windows take longer to move into place, it might be a sign the electrical system isn’t working at its best.

Thanks to today’s technology, there’s a hierarchy to where energy flows in the event of a problem. Your car is programmed to keep your car running, keeping you safe from potential problems. It’s programmed to stop supplying energy to things lower on the list – your radio or seat warmers – before turning off more vital systems – your headlights.

That’s why it’s important to pay attention to all warning signs as they occur. If you notice your radio fading in and out, there might be a reason for that.

If it keeps occurring and you notice other problems, it’s time to get your vehicle tested and the problem solved.

Noises

Cars make a variety of noises. From the moment you drove it off the lot, you’ve become attuned to the noises your car makes. Pay attention to any noises that change over time.

Do you hear a growling sound? Or a whining noise coming from under the hood? Whether something changes, gets louder, or worsens over time, your best course of action is to have a mechanic check things out.

Odor

Another warning sign that may occur is a strange odor coming from underneath the hood. A burning rubber smell could indicate parts are starting to wear out. The alternator’s drive belt is under constant tension and pressure. And because it’s near the engine, it can easily emit a burning smell as it comes closer to the engine compartment.

A burning odor can also occur as your alternator ages. If it has frayed or the wires are damaged, it’ll be reminiscent of an electrical fire.

Battery warning light

Your vehicle’s monitoring system is designed to warn you of any potential problems. When the battery warning light pops up on the dashboard, it can be from various problems. Many drivers assume it’s a problem with the battery. However, it’s also designed to illuminate any issues with the electrical system, including the alternator.

The alternator is designed to work at a specific voltage. When it falls outside of the recommended levels – usually 13 to 14.5 volts – it’s a sign that it’s failing. And when that happens, the battery dashboard light will illuminate.

Depending on how the electrical load is impacting your car, it can also cause the battery light to flicker on and off. If power isn’t getting to your headlight or wipers, for example, the battery may flicker as it attempts to do its job. If you notice this frequently, it’s worth further investigation.

Whether you’ve just started noticing a problem with your electrical system, or your car simply won’t start, we’re here to help you with all of your vehicle’s issues.

Give us a call today. We offer quality service at a reasonable price.

Diagnosing a Failing Alternator

April 17, 2020 by Denver Express Car Care

How do you know if you have a failing alternator?

Let’s start at the beginning and define what an alternator actually does.

The job of an alternator

Why do the lights stay on in your car? What controls the radio? What gives the starter the ability to start your engine running?

Nope, it’s not the battery. It’s the alternator.

The battery provides a sudden surge of electricity to the motor to start the car. Once this occurs, it’s the alternator that provides the energy to feed the electrical system, and to provide a charge back to the battery.

Think of the alternator as a generator. As the engine runs, the alternator provides electrical power throughout the system to keep everything running. It’s bolted to the engine, and is operated by a serpentine belt.

In most cases, your alternator is a maintenance-free component on your vehicle. You don’t have to add new fluids, or rotate parts out on a regular cycle. For some cars, the alternator can easily last ten, fifteen years or more without creating a problem within the system.

If an alternator does fail, it defaults back to the battery, relying on it for the short term to keep things running. But as the battery charge depletes, the engine will stall.

Because the alternator is a vital component of your car, it’s important to learn the warning signs and know how a problem will impact the ride. Here are some of the warning signs that may materialize.

Warning light

Thanks to technology, your dashboard lighting system will warn you of almost any problem your vehicle faces. When a light appears, it’s your job to recognize it and find a solution as quickly as possible. This is the best way to avoid bigger, more costly problems down the road.

On most vehicles, a problem with your alternator will show up as a small battery light. Some will light up “ALT” or “GEN” for alternator or generator. Because people see the battery light, it’s easy to slip into a mild comfort, making plans to have the battery checked at a later date. But in this case, this isn’t why the light turns on.

The battery light covers a whole host of different systems within the car. It also monitors the voltage output of the alternator, and when it goes below a predetermined limit, the light comes on. It will remain lit until action is taken.

Sometimes the light flickers, or comes on when more energy is needed. For example, if you have the windshield wipers on during a rainstorm, and your lights turn on too. In this case, small amounts of energy does not trigger a problem. But when multiple systems are used, it drains the alternator. If the battery light pops on then, it’s the alternator warning you it’s not working at its full potential.

Dim lights

Because the alternator provides power for the electrical accessories in your vehicle, if you notice a problem with any of them, it could be a sign of a weak alternator.

One of the most used accessories is your lights, both inside your car and the headlamps on the outside. If you find yourself thinking it’s darker inside your car when you flip on the lights, or you see very little difference between the standard lights and the brights, it could be a sign your alternator has an issue.

Likewise, if you notice them flickering, it could also be a sign the alternator isn’t generating enough power to keep the accessories fully charged. To be able to help a mechanic out and pinpoint the problem, watch for patterns. Can you determine when the problem happens the most? That will help narrow down where the trigger points lie.

Dead battery

Batteries are only designed to last several years. Keep that in mind, especially if you start noticing problems with the power in your car.

Diagnosing a problem with the alternator instead of a dead battery is easy. Use jumper cables to jumpstart your car. Remove them as quickly as possible. If the battery cranks over, and the alternator fails to charge, the car will die shortly after removal.

Use caution when jumping to conclusions about what’s wrong with your car, especially if it’s an older vehicle. A good mechanic can help you pinpoint the problem, and give you viable options for different ways to handle every situation.

Difficulty starting

Sometimes you turn the key expecting it to start and the car won’t engage. This can be a symptom of a problem with the alternator. However, because so much is attached to the electrical system, and controlled by the connection between the battery and the alternator, it’s important to evaluate all pieces before making a final call.

Strange smell

If the alternator isn’t working correctly, it might be producing too much heat somewhere in the system.

Have you ever smelled burning from an electrical fire? That can occur if your alternator overheats.

Have you smelled burning rubber? It might smell a little like that too. The belt that keeps the alternator moving, doing its job, is made out of rubber. So if the system overheats, it might produce the smell of burning rubber.

Strange sounds

When certain parts wear down, they start impacting other parts near them. And as this happens, it can create strange sounds. A failing alternator is often described as having a “whining” sound.

The alternator is driven by a serpentine belt, which works in conjunction with a crankshaft pulley to produce power. This belt spins faster than the pulley system, and if it’s not supported properly on the shaft it sits on, it can create friction resulting in a whining sound.

Of course, if you ignore the problem and the alternator continues to wear, it can cause further damage. The whine can move to other sounds, possibly clanking or rattles if belts brake, bolts fail, and parts disappear.

Your course of action matters

Bringing your vehicle in may not be on your list of to do’s. But the sooner you bring it in, the quicker action we can take when we figure out what’s wrong.

A failing alternator can require less repair work if you catch the problem early.

If you have a question about anything not working correctly on your vehicle, bring it in. We’ll diagnose it and give you your options, and help you make the best decision for your situation.

Blowing a Head Gasket – What Does It Mean?

February 14, 2020 by Denver Express Car Care

You’re driving along, and suddenly, your check engine light comes on. The power may decrease. You may lose power altogether. You might see smoke. Or none of the above. Still, the engine light is worrisome. What could it be?

While blowing a head gasket isn’t a common, everyday occurrence, for some makes and models, it’s more commonplace than others.

What is a head gasket?

First of all, let’s talk about what a head gasket is. It’s a simple mechanical seal that separates your engine block and your cylinder head. Every car has one, but they do change shape and size based on manufacturers’ design.

The head gasket has two primary purposes:

1. It seals the combustion chamber, ensuring you have a properly functioning engine

2. It also separates the different liquids flowing into the engine block. Fuel, oil, and coolant all serve a purpose, but it’s important to keep them separate to function properly.

Sounds like a tough job, right? It is. That’s why you could argue that the head gasket is one of the most important parts of your engine block.

Because a head gasket is part of the combustion process, it must be tough. A lot of pressure occurs as your car burns fuel and releases energy. It can’t melt, change, or weaken under pressure. That’s why most head gaskets today are made from a variety of composite materials, steel, or even copper with high-performance vehicles.

Why head gaskets blow

A head gasket’s job is to create a seal between the engine block and the cylinder head. Because it comes in contact with extremely hot, high pressure combustion, as well as varying temperatures from the coolant, it has to perform well under extremes. This can create a lot of tension over time. Eventually, the head gasket can develop a leak. It doesn’t matter the make or model of your car, or how well you care for it. The pressure can eventually build.

What’s more, it’s not a part you can easily see, which means it could very well have a problem and continue operating that way for a long time. Until it eventually blows.

Since you can’t readily see it, it’s important to understand the warning signals so you can accurately diagnose the problem before it turns into something significant.

Things to watch for that signal a blown head gasket

Because a head gasket’s job is critical, it’s crucial to replace it at the first sign something is wrong. Watch for these signs, and see your mechanic right away.

An overheating engine – If you watch the temperature gauge on your vehicle, you might start to see temperatures moving up. That’s because the coolant is no longer doing its job. If the coolant leaks or burns away, there isn’t enough left in the engine to cool it properly. Eventually, the engine overheats. Hopefully, the warning light on the dashboard lights and gives you enough time to turn off your vehicle and fix your car before further damage can occur.

A poorly operating engine – Because head gaskets don’t always go from working to broken overnight, you’ll often see engine performance declining first. Watch for things like decreased power or a rough idle. This can signal fuel is reaching the combustion chamber and isn’t firing correctly.

Low coolant – A part of your maintenance routine should be to check your fluid levels. If your coolant starts to lower without any visible signs of a leak, it could be a problem with your head gasket.

White, milky oil – Remember, your head gasket separates the different fluids as they enter the engine block. Even a small leak can allow these fluids to intermix. If your oil starts to look white or milky, it’s been compromised. Coolant is leaking in and making the lubricating process less effective.

White smoke – As the vehicle runs, you might start to notice white smoke flowing from the tailpipe. Leaking coolant produces steam. It’s water and burned glycol flowing from the combustion chamber. Keep in mind that other than seeing the white smoke, your car may appear to operate normally until the coolant is all gone.

Leaking coolant – If the coolant begins leaking below the exhaust manifold, you’ll see a small puddle forming on the ground. This is the easiest way to diagnose a problem with your head gasket. Always look at the ground of your regular parking spaces to keep an eye out for potential problems.

Bubbles in the radiator or overflow tank – If the head gasket between the coolant line and the combustion chamber is compromised, it can allow air to push into the system. While bubbles might not seem like a bad thing, if allowed to continue, they eventually can form a large pocket of air and stop the coolant from flowing. This can stop your car in its tracks.

Spark plug problems – If coolant flows into the combustion chamber, it can cause problems with the spark plugs. If you notice your car misfiring, this could be one of the reasons.

Is it okay to drive with a blown head gasket?

As you can tell from the above symptoms, it can be quite tricky at times to determine if you do have a blown head gasket. Therefore, you might drive with it for quite a while.

The key is in watching for the symptoms and fix problems before they are allowed to fester and grow. It’s easier and cheaper to fix minor issues than it is to do a complete system overhaul.

Pay attention to how your car operates. You can even keep a log as your car ages.

If there are problems with the head gasket, hot gases and liquids, and cold coolant are moving through the mechanics and can quickly erode or warp the metal of the engine block. The longer it goes unnoticed, the more damage can occur. That leaves you with costly repair bills when you do finally bring your car in for servicing.

Are there ways to prevent a head gasket from blowing?

One of the simplest ways to prevent the head gasket from blowing is to ensure your engine doesn’t overheat. Frequent maintenance can help with that. Regular oil changes will ensure your system always has fresh oil and is properly topped off. Checking your coolant levels will ensure it’s properly filled as well. Watch for evidence of leaks as well.

Try to keep from pushing your car on a regular basis. Avoid aggressive driving. This increases RPMs and increases stress on your engine. Likewise, if your car has a turbocharger or supercharger, keep the combustion pressures as low as possible. More stress means more heat, which can push the deterioration process of different parts.

Have you ever experienced a blown head gasket?

How To Improve Fuel Economy

January 26, 2020 by Denver Express Car Care

Imagine living without a car. It’s something few of us can imagine. Families don’t just have one or even two in the driveway; instead, they’ve become mandatory for every driver in the household.

Here in Denver, it’s almost impossible to exist without a car. Some choose downtown living to be close to everything. But mass transit will only get you so far. We’re not set up like other cities. Your car is your key to freedom. It gets you into the hills for a day of skiing, around town for a day of errands, and out late at night when you’re ready to hang with friends.

But all that running around means burning more fuel. And even though fuel has somewhat steadied in price over the years, it still can take a lot to fill your tank up every week. It’s quite the line item in your monthly budget. Is there a way to improve fuel economy to save money? If the manufacturer gives you a fuel efficiency range, is there a way to always be in the upper range?

Turns out, there is. You don’t have to invest in an electric car, or make radical changes to your existing car to see the benefits.

What causes poor gas mileage?

Bad gas mileage is caused by a number of things. Ultimately, they can be lumped into two categories: problems with your car, or problems with your driving habits.

Poor gas mileage means that your car isn’t operating as efficiently as it possibly can. It also means you’re losing money every time you pull into the pumps because you’re having to do so more frequently than necessary.

Let’s start with your car. The best reason to keep it in good working condition is for performance. If it’s running correctly, it will perform at its best. And that means you’ll see the best fuel economy possible for your make and model.

Poor fuel economy can come from:

Bad oxygen sensors or air filters. The oxygen sensor helps keep the proper mixture of air and fuel in your car. If this is out of balance, your car will be inefficient. The air filter grows dirtier the longer it’s in place. They need to be cleaned and replaced on a regular basis to ensure your car is working as it should.

Incorrect tire pressure. Proper tire pressure means your car is handling as designed. Tire pressure is easy to check, and should be checked and filled regularly. You’ll find manufacturer’s recommended pressure levels either on the driver’s side doorplate, or in your owner’s manual. Over inflating is equally as bad as underinflated tires; keep them in the range suggested by the manufacturer.

Spark plug problems. Spark plugs are designed to spark combustion and start your engine. If they misfire, or are working poorly, they reduce the efficiency of the fuel supply.

Bad fuel injectors. The fuel injectors are responsible for moving fuel into the engine. If the system has a leak, the proper amount of fuel isn’t making it where it’s supposed to be.

The wrong motor oil. Different cars use different types of motor oil. You can’t expect to put in the cheapest form and expect it to run at high performance levels. Think of it as the difference between living on cheap processed food versus a whole grain, fruit and vegetable diet. Both will keep you alive, but one will make you more efficient at everything you do. Check your owner’s manual for guidance on the right motor oil, or ask one of our mechanics which is the right for your vehicle.

How can I improve my fuel economy?

Once your car is in the best shape possible, it’s up to you to turn your driving habits around in order to avoid poor fuel economy.

Avoid the “pedal to the metal.” When was the last time you left late for work, or for a meeting? Did you push how fast you drove by a few miles? Did you ride closer to the person in front of you, zipping in and out of traffic trying to make up the time? While you might save a minute or two, you’re also cutting back on your engine’s efficiency. To push your car harder, faster, it takes more fuel to get there.

The same holds true when you slam on the brakes. Sudden acceleration away from stoplights or stop signs, combined with pounding on the brakes as you get too close to the person in front of you kills fuel economy. It also wears down other parts of your vehicle like the braking system. Not only will you spend more money at the pump, but you’ll also spend more time and money in the repair shop too.

Pay attention to fuel grade. Do you know what grade of fuel your vehicle’s make and model are supposed to have? It’s easy to think that if you put a higher performance fuel into your car, it will run better. But that isn’t always the case. When your car was designed, it had certain specifications in mind. They built it, tested it, and tested it some more. Then they created recommendations to ensure it runs at optimal performance levels so long as you abide by their guidelines. Likewise, if you have a high performance car, putting higher octane fuel isn’t just important, it’s also a requirement to ensure it works its best. Check with the guidelines and pay attention at the pump.

Watch weight. Today’s vehicles are bigger than ever before. We love our SUVs and crossovers to be able to bring everything we need with us. But does your vehicle look like you’re going on vacation when all you’re doing is driving to work? The more stuff you carry in your car, the more it weighs. And a heavier vehicle has to work harder to get from point A to point B.

Stop idling. Did you know it takes up to a gallon of fuel to leave your car idling for an hour? That means the time you spend sitting in carpool lane, waiting for your spouse to run into the grocery store, or even turning your car on in the morning to let it warm up has an impact on your fuel economy. Turning your car off in each of these situations will actually help you be more efficient overall.

What steps have you taken to improve your vehicle’s fuel economy?

Driving With The Check Engine Light On – What You Need To Know

January 17, 2020 by Denver Express Car Care

We’ve all experienced it from time to time. You’re driving along, and the check engine turns on. What should you do? Do you keep driving? Or should you pull over immediately?

It depends on what your car is doing.

Step one – Diagnose the situation

You know your car best. What has your car been doing up until this point?

Have you heard funny noises? Has your car been operating differently the past few days? Have you smelled strange odors? Have you been having other issues with your driving experience? Your car rarely has an immediate effect without leaving a telltale sign.

If the check engine light turns on and is steady, not flashing, you can keep driving as long as your vehicle isn’t performing out of the ordinary. A steady light is your car’s way of telling you your car is in need of service. (We’ll get into that more in a minute.)

If the check engine light flashes, it’s a more pressing matter. The check engine light is usually yellow or sometimes a red engine-shaped icon located somewhere on your dashboard. All lights might blink on when you first start the car. This is a more serious situation when it blinks and continues to flash after your vehicle is on.

Step two – Heed the warning signs

The check engine light is usually a small icon in the middle of your dashboard, yellow or red in color. All lights may turn on for a few seconds as you start the car. This is your vehicle’s way of testing the system and sending energy to all parts of the car. This is normal.

What isn’t normal is if your check engine continually illuminates as you drive your car. Does the warning light blink for over 6 seconds? Does it continue to blink as you move down the road? This may be an emergency situation. Your car is telling you there is a serious problem with the engine.

Slow down. Pull over as soon as possible. Stop the car and turn off the engine. Otherwise, you risk damaging various parts of your car. Driving with the engine light on at this point will continue to wreak havoc with your car.

Today’s vehicles have all sorts of computerized sensors. It’s designed to take the guesswork out of car maintenance. Instead of having to watch and listen for the signs, your car has a built in system designed to provide you with a warning system to alert you to potential dangers. At the first sign of trouble, it alerts you with a warning light.

The first stage is a steady light. This indicates there is a minor problem somewhere in the system. This gives you a chance to get to where you’re going, schedule a maintenance visit, and fix the problem before it grows.

The second stage is a flashing light. This is an indication there is a severe fault somewhere in the system. It’s your vehicle’s way of telling you something is wrong. Pull over, stop the car, and get service immediately.

While this little blinking light is your car’s way of talking to you, there’s actually more going on behind the scenes. When you bring your vehicle in for service, the engine control unit also stores a fault code related to the malfunction. This can be read and interpreted by your mechanic using a diagnostic tool. After reading the fault codes and diagnosing the full complexity of the situation, a mechanic will then recommend the necessary repairs.

Keep in mind, that the check engine can come on for anything that might be wrong with the system. It might be a small problem or a very large repair. Until its diagnosed, you simply don’t know.

What are the most common causes for the check engine light to come on?

A faulty oxygen sensor – this sensor is designed to monitor the unburned oxygen within the car’s fuel system. It then communicates with the car’s computer to adjust the mixture of air and fuel to ensure your car is getting what it needs to run properly. If the sensor is faulty, your car will burn more fuel, and won’t run as efficiently, releasing more emissions into the air.

A faulty gas cap – when the gas cap is firmly in place on your car, it creates a vapor lock to keep the gas inside the system. If it’s loose, cracked, or faulty, it can cause a leak. Some leaks are more serious than others; a vapor leak might be easily fixed by creating a tighter seal, whereas a crack could be releasing gas into the upper portion of the fuel system, damaging equipment.

A faulty catalytic converter – the catalytic converter controls emissions in your vehicle’s exhaust system. It converts carbon monoxide and other potentially harmful gases into byproducts that aren’t as harmful. If a catalytic converter is faulty, your car can’t perform at optimal levels, and the performance of your vehicle will be impacted.

A faulty mass airflow sensor – the mass airflow sensor, also known as the MAF sensor, helps your car determine how much fuel to be added to the system based on how much air supply is getting to the motor. The most common reason for this sensor failure is due to a dirty air filter, or one that hasn’t been installed correctly. A failure will mean a decrease in fuel economy and poorer performance for your car.

A faulty spark plug – when was the last time you replaced your spark plugs? It’s important to do so according to your car’s manufacturers’ guidelines. The spark plugs and wires work together to ignite the air/fuel mixture and transfer the spark to the ignition coils and plugs. If the spark doesn’t work properly, it reduces fuel efficiency and engine performance.

Can you safely drive with the check engine light on?

Don’t let this little light make you panic. It isn’t always telling you a dire emergency is in place.

If you pay attention to your car, you will understand more about what it’s trying to tell you. You’ll know what to do in every situation.

A check engine light that is flashing is telling you to stop the car as soon as you reach safety. Call in a tow and bring it into one of our mechanics to diagnose the problem.
A check engine light that is solid is a gentle reminder to bring your car in at your earliest convenience. It’s your car’s way of saying it needs a little maintenance.

Schedule your appointment today.

Car Maintenance 101: What To Do When Your Engine Overheats

December 17, 2019 by Denver Express Car Care

Food for thought: even one instance of your car’s engine overheating can permanently damage your engine. And that can be a very expensive venture.

While you might not think Colorado is the epicenter of car engine’s overheating, it does happen. Those 100 degree days can take their toll, especially if you climb up into the mountains, or tow your boat to your favorite reservoir.

Why do engines overheat?

Engines overheat for a variety of reasons. In most cases, it’s because the cooling system isn’t operating the way it should, so heat isn’t able to escape the engine compartment. It could be from a leak in the cooling system, a radiator fan gone bad, a broken water pump, or a bad coolant hose. The moment you notice a problem, quick action should be taken. If not, your engine might sustain permanent damage.

What are the signs of an engine overheating?

Like every part in your car, you’ll likely have a few warning signs before your car’s engine hits a critical point and overheats. Act quickly, and you can reduce the risk of irreversible damage. Watch for:

Steam – if you notice steam escaping around the edges of your car’s hood, seek assistance
High temperature gauge – those dashboard warning gauges are there for a reason. If you notice the gauge quickly escalating to “H” or red, you have a problem.
Smell – any unusual smell that comes from your car engine area should be checked out. Leaking coolant will have a sweet smell, while an oil leak may have more of a burnt smell.

If you notice any of these happening to your vehicle, your quick action will make the difference between a simple repair job or complete replacement.

What to do when your engine overheats?

Engines overheat mostly in the summer for a reason. High temperatures put stress on your car, and you increase that stress by cranking up the air conditioner as high as it will go. At the first sign of overheating, turn off the air conditioner to reduce the stress. Then turn on the heat to maximum levels to help pull heat away from the engine. Pull over as soon as possible.

Once you’re safely off the road, shut off the car. Your engine will need at least 15 minutes to cool down. While you wait, watch the temperature gauge; does it move back into the normal range? You can also take note of what’s happening to share with your auto mechanic. Then start creating a plan.

You’ll need a tow truck to bring your vehicle in to be serviced. This isn’t the time to trust the local garage right off the highway. Instead, bringing your vehicle into us here at Express Car Care ensures you have a mechanic you can trust to give you the real scoop on what’s happening with your vehicle.

You can also check your coolant levels and see if they are running low. This may be a sign you have a leak in the coolant system, a broken radiator fan, or trouble with the water pump. If you do have extra coolant with you, topping it off can further help protect your engine.

While towing is your best course of action, if it’s not an option, carefully start your car after it’s cooled completely. Drive it into our shop, keeping a careful eye on the temperature gauge as you drive. Turn the car off quickly if any further signs of overheating show up.

What shouldn’t you do when your engine overheats?

We’ve all seen cars off to the side of the road, hood up, smoke billowing out all around it. In reality, opening your hood immediately isn’t good advice. Instead, wait until your engine cools before popping the hood. Opening the hood immediately puts you at greater risk of burns or injury as smoke and steam flow out. Wait until the engine temperature gauge returns to normal range before opening your hood.

Don’t ignore the problem, thinking that if the temperature gauge returned to normal, the problem no longer exists. It does. This was a warning sign of things to come. It will get worse if you don’t address the situation soon. We can help you get to the root of the problem, requiring far less repair work now than if you wait until the situation becomes worse.

You should also stop driving as soon as possible. This doesn’t mean find the nearest exit and drive to a service station. It means pulling over to the side of the road as soon as you can. For every mile you continue to drive your car, further damage occurs to your engine, and greater risk of permanently damaging it increases.

Is there a way to prevent an engine from overheating?

The easiest way to prevent engine overheating is to maintain your vehicle properly. That means scheduling regular maintenance visits to allow one of our mechanics to evaluate your car’s system fully, and repair and maintain each system as needed.

You already know how important changing out motor oil is. Your vehicle’s other systems require regular maintenance too. Your engine’s coolant should be flushed and refilled as needed. Radiator should be up to date according to manufacturer’s guidelines. Routine maintenance can also stay on top of leaks, cracks, and wearing hoses and belts, giving you increased opportunities for catching problems before they occur.

While engine overheating can occur in all vehicles, it’s more problematic the older a car gets. Older vehicles will need more maintenance over time. As long as you replace parts, add fluids, and regularly check to ensure systems are operating the way they should, you’ll have a car you can depend on.

It’s difficult to predict when a problem is going to occur with your engine. But if you stay ahead of potential problems by regularly maintaining your vehicle, and know the warning signs and what to do in the event your engine overheats, you’ll be more likely to lessen the risk.

We’re here to help you with all of your car repair needs.

Fuel System Cleaning

September 2, 2019 by Denver Express Car Care

Fuel, whether gasoline or diesel, is delivered to your engine to be burned in order to generate the power needed to keep you moving. This fuel leaves a residue as it moves through your fuel system. This may not seem like much, but it can cause big problems. Gum and varnish build up inside fuel lines, the throttle body and injectors. It’s like plaque build-up in your arteries – it restricts the free flow of fuel and can even clog your fuel injectors.

In addition, carbon from combustion starts to accumulate on the valves, inside the combustion chamber and on your pistons. This interferes with proper mixing of fuel and air and can prevent your valves from sealing properly. This means you will have less power, a rough running engine and wasted fuel – and could even lead to expensive damage over time.

A fuel system cleaning clears out the gum and varnish from your fuel system and gets your injectors working properly, restoring power and fuel efficiency. Carbon deposits are dissolved, and your engine starts running like new again.

If your engine seems sluggish and less responsive than it used to be, it might mean that you are in need of a fuel system cleaning. Ask your service adviser if a fuel system cleaning is the right thing for you.

Give us a call or come in and see us, we’re here to help.

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