I Smell Rotten Eggs in My Car’s Exhaust

January 1, 2022

If you smell rotten eggs in your car’s exhaust, your catalytic converter is dying. This crucial exhaust system part treats the harmful emissions so they can be safely released into the environment. Pit Shop Auto Repair can test your catalytic converter and replace it if necessary. If you drive a vehicle that is 10 years old, this is the average lifespan of the catalytic converter. Aside from smelling rotten eggs, you may also experience the following if your catalytic converter is going bad.

Acceleration Lag

One common problem with older catalytic converters is that they get clogged. They are clogged by carbon deposits resulting from your vehicle’s exhaust. Once the catalytic converter gets clogged, the exhaust is unable to flow through the exhaust system and out the tailpipe. Unfortunately, this clogs the combustion chamber. A clogged combustion chamber cannot produce engine combustion effectively, and, consequently, your vehicle’s acceleration will suffer.

Performance Lag

The acceleration isn’t the only thing that will lag. Your engine’s performance will also lag if the combustion chamber is filled with vehicle exhaust. The combustion chamber needs to be cleared so fresh air and fuel can be burned. If this isn’t happening, you will notice that your engine will sputter and struggle to run at high speeds. In severe cases, your engine will also sputter and struggle to run when you are driving slowly. You will also experience rough idling.

Dark Exhaust Smoke

Another sign that your catalytic converter is going out is dark exhaust smoke flowing out of the tailpipe. This is an indication that there is too much fuel in the combustion chamber. It can also suggest that the vehicle’s exhaust is not being treated by the catalytic converter as it flows through it. Unfortunately, you are releasing dangerous toxins into the environment. In addition, if you live in a state your emissions testing is required, your vehicle will fail the emissions test.

Excessive Heat

Finally, your catalytic converter will produce excessive heat if it is clogged or malfunctioning. This heat will be primarily underneath your automobile, as this is where the catalytic converter is located. Because heat rises, however, your engine will begin to run too hot, as well. In fact, if your catalytic converter is going bad, your engine may overheat every time you drive your automobile.

Call Pit Shop Auto Repair in Libertyville, IL, today if you suspect that your catalytic converter is going bad. We will inspect the converter and replacement if necessary.

6 Warning Lights You Should Never Ignore in European Cars | Pit Shop Auto Repair
September 26, 2025
Pit Shop Auto Repair in Libertyville, IL, highlights six dashboard warning lights European car drivers should never ignore.
Transmission | Pit Shop Auto Repair - Libertyville
July 3, 2025
European cars are known for their performance, engineering, and smooth ride—but even the most finely tuned vehicle can run into problems, especially with one of its most critical systems: the transmission. At Pit Shop European, we specialize in servicing European makes and models, and we know that transmission issues can sneak up on you if...
Auto Repair | Pit Shop Auto Repair - Libertyville
July 3, 2025
When your check engine light comes on, your brakes start squeaking, or your car just doesn’t sound right, the last thing you want to deal with is an overpriced repair or pushy upsell. At Pit Shop Auto Repair in Libertyville, we believe car care should be straightforward, honest, and fairly priced—every single time. As your […]
Diesel Repair | Pit Shop Auto Repair - Libertyville
July 2, 2025
Top 5 Signs Your Diesel Engine Needs Immediate Attention Diesel engines are known for their power, durability, and longevity, but even the toughest trucks can break down if small problems go unchecked. Whether you’re hauling heavy loads or just depend on your diesel vehicle for day-to-day tasks, knowing the signs of engine trouble can save...
Diesel Truck | Pit Shop Auto Repair - Libertyville
June 4, 2025
How to Keep Your Diesel Truck Cool and Running Strong This Summer Summer is hard on vehicles—especially diesel trucks. Between the scorching heat, longer drives, and heavier loads, your engine works overtime. Without the right maintenance, it’s easy for problems like overheating, coolant leaks, or decreased performance to sneak up on you. At Pit Shop...
Vehicle on the road | Pit Shop Auto Repair - Libertyville
June 4, 2025
As temperatures rise, so do the demands on your vehicle. For owners of European luxury cars like BMW, Audi, and Mercedes-Benz, warm weather can bring out a unique set of maintenance concerns. While these vehicles are known for performance and engineering excellence, their precision systems can be more sensitive to heat-related stress than other makes....
A person is driving a car | Pit Shop Auto Repair - Libertyville
June 4, 2025
As the temperatures rise in Libertyville, so do the chances of vehicle issues if your car isn’t properly maintained. Summer heat, increased road travel, and unpredictable weather all take a toll on your vehicle. That’s why it’s important to run through a summer car maintenance checklist before hitting the road for vacations, commutes, or weekend […]
White car on the road | Pit Shop Auto Repair - Libertyville
May 7, 2025
As Illinois heads into the warmer months, many drivers start thinking about summer road trips, weekend adventures, and enjoying the open road. But rising temperatures can also mean added stress for your vehicle. Heat affects everything from your engine to your tires, which is why it’s important to give your car a little extra care […]
Car headlight | Pit Shop Auto Repair - Libertyville
May 7, 2025
Owning a European luxury vehicle isn’t just about driving—it’s about experiencing precision engineering, high performance, and exceptional comfort. Brands like BMW, Audi, Mercedes-Benz, and Porsche are built to last, but like any fine-tuned machine, they need proper care to stay at their best. At Pit Shop European, we specialize in servicing European vehicles and helping...
A/C Repair | Pit Shop Auto Repair - Libertyville
May 7, 2025
The Importance of Cooling System Checks in Diesel Engines Your diesel engine works hard—hauling heavy loads, powering work vehicles, and handling long drives in all kinds of weather. But as the temperatures rise, one system becomes more critical than ever: the cooling system. At Pit Shop Diesel Repair, we know how essential a well-maintained cooling...