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Exhaust systems are just one of the many components that make the modern car a pleasure to drive. While we all want our exhaust system to sound good, a noticeable difference exists between a good, throaty exhaust note and something out of a junkyard.
From a loose exhaust clamp to a rusty mid pipe or a missing muffler, the signs are evident if you know what to listen and look for. The best thing to do is to get the problem resolved at once. As with most issues, it's only going to get worse if left alone.
When That Check Engine Light Goes On
Picture this. You're driving along and over the last few days, you may have noticed a slight smell and your exhaust getting louder. No big deal, right? But this time, it's different. That pesky Check Engine Light comes on.
You may have heard others saying it's alright to drive with a CEL light on. It’s probably some sensor that doesn’t do much anyway. But remember, sensors do serve a purpose. That goes for the same for sensors found in the exhaust system.
The most likely culprit of a Check Engine Light on the exhaust system is the oxygen sensor. Most vehicles have upstream and downstream oxygen sensors to measure the unburned oxygen in the exhaust. The ECU can adjust the air-fuel mixture for the best performance and fuel economy.
An OBDII code reader will be your best friend when determining which sensor is acting up. Another good question to ask yourself is why it failed in the first place. Was it at the end of its duty cycle, or did faulty exhaust components set it off?
When You Hear Loud Acceleration Noises
There are two ways to get your car's exhaust to sound louder. The professional way is installing a custom exhaust system and then there’s the “I'll take care of that later” way. An aftermarket exhaust will turn heads for all the right reasons, whereas the second option will get you noticed, but not in the way you’d hoped.
When your exhaust system has had enough, whether it be through use or damage, it's going to sound bad. Getting to the bottom of it is easy. A simple visual inspection of all its components, including exhaust headers, catalytic converter(s), and muffler(s) for damage, will likely point you in the right direction.
Don't forget that hangers and couplings can also cause loud noises while accelerating. A loud “thunk” or vibration can indicate a worn-out exhaust hanger bushing or loose exhaust shield. Be thorough with your examination, and don’t leave anything up to chance. As usual, make sure the engine is off, and the exhaust system is cool to prevent injury or burns.
Funny Smells and Poor Fuel Economy
Of course, driving past a garbage truck or next to a treatment plant will give off unpleasant smells. However, if your eyes and throat start stinging while driving like you’ve eaten a hot pepper for some internet challenge, the problem might be the exhaust.
Another telltale sign is a constant rotten egg smell. A catalytic converter is designed to reduce emissions by neutralizing toxic gasses from your vehicle's engine. When it's clogged up, the first thing you’ll notice is a sulfur smell, reduced performance, and black smoke.
With that ungodly smell comes poor fuel economy, too. Does your gas tank need gas more than it used to? A clogged catalytic or defective exhaust system might be the cause. The engine must work that much harder to produce the same amount of power. In turn, you step on the gas pedal harder in hopes of getting the same acceleration.
Engines need an unobstructed path that allows air to go in and out. Something as simple as a clogged air filter or exhaust blockage will affect gas mileage. Investigating the cause can save you money at the pump.
Other Signs That Your Exhaust Is Failing
Mentioned above are just some of the most common warning signs of exhaust failure. Unfortunately, vehicles are complex pieces of engineering and there are plenty of other signs to keep an eye out for.
- Hesitation. Not getting off the line as fast as you remember? Does your car seem to sputter and fall on its face as soon as you hit the gas? These can be indications of a clogged catalytic converter or exhaust system problem.
- Backfiring or Popping Noise. In recent years, crackle and pop tuning has become a must-have mod for car enthusiasts. In fact, some manufacturers have integrated their vehicles from the factory. If your vehicle has started backfiring recently, it hasn't been tuned by the car gods overnight. Rather, your exhaust system has some serious exhaust kinks that need to be worked out.
- Whistling or Hissing Sound. Even the smallest pinhole or loose clamp will cause a leak. At the beginning, a faint whistling or hissing sound will be present. Leave it for longer and it will develop into something that makes everyone around give you unwanted looks. Rust is most likely the cause of this. Get the part in question replaced as soon as possible.
- High Engine Temperatures. Rising engine temperature or cabin temperature may be a sign of exhaust issues. If the spent gas has nowhere to go, it will cause temperatures to eventually heat up your cab faster than a mid-summer day in the Arizona desert. Leave it alone for long enough and it can cause irreversible engine damage.
Final Words
The exhaust system plays a crucial role in the overall function of your car. This post was designed to help you get a better understanding of the warning signs of an exhaust failure and what to do when that happens. JEGS is all about providing high-quality parts that make your ride sound and drive better, and we are dedicated auto enthusiasts just like you. Our team of experts is ready to answer any questions you might have.
Ready to take the next step and improve your exhaust system? Check out JEGS’ lineup of exhaust components. From headers to mufflers and everything in between, JEGS has you covered.
