Although many drivers take it for granted, the exhaust system plays a vital role in the overall health and performance of your car. The exhaust system is a complex network of interconnected parts, including the exhaust manifold, oxygen sensors, catalytic converter, tailpipe, muffler and, in some models, a resonator. Each part plays a vital role. They must all operate together harmoniously to effectively manage exhaust gases; when any part malfunctions, it compromises the entire system.
What Does the Exhaust System Do?
When your car’s engine ignites the fuel-air mixture inside the combustion chamber, it creates a powerful explosion that propels your vehicle forward. However, this process also produces a mix of harmful gases that are dangerous if inhaled for too long. This is where the exhaust system comes into play.
As the engine pumps out these gases, the exhaust manifold collects them from each cylinder and directs them into a single pipe. From there, the gases flow through the catalytic converter, which contains special catalysts that help convert harmful emissions into less toxic substances. Next, the gases pass through the resonator, which helps reduce engine noise and vibrations. Finally, the gases enter the muffler, where they’re dispersed and expelled through the tailpipe.
The exhaust system helps keep you safe by redirecting those gases away from the passenger cabin; it also reduces engine noises and controls emissions that can harm the environment. So, it’s essential to keep an eye (and ear and nose!) out for any signs of exhaust system issues.
If your exhaust system has a leak or any faulty components, you don’t want to ignore it. Not only can it be harmful to your health, but a properly working exhaust system is important for the sake of your vehicle’s performance. Neglecting repairs can lead to serious (and expensive!) engine damage, as well as performance issues and a drop in fuel efficiency.
Common Signs of Exhaust System Issues
Here are some of the most common signs your exhaust system needs attention:
Poor Fuel Efficiency
If you find yourself needing to refuel more often than usual, you may have an exhaust leak. Exhaust leaks can cause the oxygen sensor to produce an inaccurate reading, which can lead to the engine consuming more fuel—and a decrease in your mileage.
More importantly, an exhaust leak means that harmful gases aren’t being properly expelled from your car’s exhaust system. This can cause higher engine temperatures, which can lead to higher fuel consumption. In some cases, the exhaust gases may also infiltrate the cabin, so if you notice a decline in your gas mileage without an obvious cause, it’s crucial to have your vehicle inspected as soon as possible.
Excessive Vibrations
If you notice unusual or excessive vibrations on the steering wheel, gas pedal, or seat, it’s likely due to a problem with your exhaust system. A common culprit is a rusty exhaust pipe—something that’s commonly seen in vehicles that are mainly used for short trips. When you take short trips, the muffler and tailpipe don’t get hot enough to evaporate the moisture that collects in the system. The condensation will sit in the system and can eventually cause corrosion. Another common reason for excessive vibrations is exhaust leaks. In either case, it’s important to have your system inspected and repaired promptly to avoid more expensive repairs or safety issues.
Engine noise
When it comes to engine noise, there are several potential causes, but one common culprit is often a leak in the exhaust system. If you hear a loud rumbling sound from the engine that rises and falls with your vehicle’s RPMs, this is a clear indication of an exhaust leak—likely in the exhaust manifold or at one of the joints along the exhaust system. Again, it’s important to address exhaust leaks promptly to prevent health risks to you and your passengers.
Rattling Noises
Any unusual noises coming from your vehicle are cause for concern. If you hear a constant rattling sound near the rear of your vehicle, it’s a clear indication of a problem; you could have a loose or faulty catalytic converter or a loose exhaust pipe. If one of the parts is loose, it’s a serious safety concern—you don’t want one of these to come off while you’re driving! By addressing the problem swiftly, you can ensure your safety and potentially avoid more costly repairs down the road.
Hissing or Popping Noises
Another kind of noise that can indicate exhaust issues is a hissing or popping noise while the engine is running. These sounds can indicate a blockage in the exhaust system, which causes abnormally high back pressure. If you hear hissing or popping noises, it’s important to pay attention to other signs of trouble, such as discolored burned spark plug wires or boots or burned paint near the exhaust ports on the cylinder head.
Burning Smells
A burning smell is never a good sign when it comes to your vehicle. Although it could be due to a number of issues, like electrical problems, worn brake pads, or an overheated AC compressor, it could be due to a failed gasket. When a gasket in the exhaust system fails and begins to leak, the heat generated by the escaping gas can cause nearby components to burn—especially if the failed gasket is near the engine wiring. As a result, you’ll notice a burning smell in the cabin. If the leak is severe, you may also notice smoke.
Whether or not you see smoke, it’s best to turn off your engine and exit your car while it cools down. Once you’ve safely dealt with the situation, it’s essential to avoid driving and have your exhaust system thoroughly inspected. It’s always best to err on the side of caution rather than risk your safety or further complications.
Gas Smells
Another odor that indicates an exhaust system issue is the smell of gas inside your car. When one of the exhaust pipes becomes damaged and develops a leak, gas fumes, along with other exhaust gases, will escape from the opening. These noxious fumes can then make their way inside the cabin, where they can be breathed in by you and your passengers. Because of the safety hazards, gas smells should never be ignored; schedule an appointment to have the issue addressed right away.
Performance Issues
When there’s a problem with the exhaust system, you’ll likely notice an impact on your vehicle’s performance. One of the most common culprits for performance issues is a problem with the catalytic converter, which can cause difficulties during startup and a decrease in accelerating power. Exhaust leaks can also contribute to performance issues because they disrupt the proper flow of exhaust gas, affecting the engine’s overall efficiency and performance.
The Check Engine Light
An issue with the exhaust system could cause the check engine light to come on. Most drivers know the check engine light is never good news, but what many don’t realize is that the check engine light can let you know how severe a problem is. For example, if the onboard computer detects a minor issue, the light will be steady; if a more serious issue is detected, the light will blink. A blinking light should never be ignored because the issue could lead to irreversible engine damage. If the check engine light is blinking, avoid driving your vehicle and schedule an appointment for diagnostics.
Visible Rust, Holes, or Other Damage
If you notice visual damage on your exhaust system, such as a heavily rusted tailpipe or loose or detached components, it’s time to bring your vehicle to a repair shop. Ignoring these issues can only lead to more expensive problems in the future!
For Exhaust Inspections, Repair & Maintenance, Visit Express Auto/RV Care Center!
Paying attention to the signs of exhaust system issues is crucial for maintaining the performance, efficiency, and safety of your vehicle. By being vigilant and addressing minor issues proactively, you can potentially save money on more extensive repairs.
If you’ve noticed any of the above signs, don’t wait! Schedule an appointment at Express Auto/RV Care Center. We offer complete care for your exhaust system, including inspections, repair, and maintenance. Our skilled technicians are equipped to diagnose and repair issues with your exhaust system and ensure your vehicle is operating at peak efficiency. Contact us today at (928) 305-0767 or request an appointment online!
Want more great advice on saving money on car repairs? Order Russell McCloud’s book Knowledge is Power by clicking here.