If your car running poorly, and you just can't figure out why, or if the check engine light on or there is a tick or rumble when you start the car, you may need to have your car examined. These are all symptoms of an exhaust leak on your car. Even if you don't smell a leak, you should find and address the leak before more serious problems occur.
Keep the car cool while you search for the leak. As the car heats up, metal expands, which can close small leaks.
2
Ask a friend to cover the tailpipe to force the exhaust through any leaks. Feel for leaks by running your hand near the exhaust system, without touching it. You don't want to burn yourself on these extremely hot parts.
3
Isolate the engine noise from the sound of the leak using a mechanic's stethoscope. Listen for the rush of escaping exhaust. You may need to replace the solid probe portion with tubing to maneuver in the area better and hear the exhaust noises.
4
Inspect the exhaust pipe where it bends over the rear axle, as this is a common area for cracks and leaks. Leaks tend to occur more often on pipes that are bent or exposed.
5
Start your hunt at the engine and follow the exhaust system all the way to the end of the tail pipe. Thoroughly check all connectors along the way, as these areas commonly have leaks.
6
Inspect the exhaust manifold for cracking. This may require removing parts of the exhaust system and engine. Cracking and warping of the manifold is quite common, especially with older cars.
7
Check the gaskets. This tends to be the most common cause of leaks. If you have an older car, your gasket connecting the manifold to the cylinder head may have cracked during normal use.
8
Touch rusty areas on pipes and mufflers to see whether the rust is surface or goes all the way through the part. Areas weakened by rust often cause leaks.
Tips & Warnings
If all else fails, take your car to an exhaust shop or specialized mechanic. Most will run the exhaust tests free of charge and let you know if there is a leak.
