How to Test for Exhaust Leaks
A vehicle's exhaust system has a two-fold purpose -- it quiets engine noise while pushing toxic fumes away from the car's interior. Leaks in the exhaust system could allow the gases to waft into the passenger compartment, injuring or even killing riders with enough exposure. Mufflers and exhaust pipes break down with age. Winter weather, especially regularly driving on salted roads, exacerbates the decay. Always check your exhaust system for leaks if you hear noise from the area, or feel dizzy or nauseous while driving -- these could be symptoms of carbon monoxide in the passenger cabin.
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Instructions
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Park your vehicle on a flat, paved surface and wait for it to cool completely before testing it. Put on protective eye wear, such as safety goggles, then slide under the car so you have a good view of the exhaust system.
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Shine a flashlight on the exhaust system, starting at the tail pipe and working back toward the manifold. Check for a white powdery substance on connections between the exhaust system components. This indicates a leak in the manifold region.
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Apply even pressure with pliers at several points along the exhaust system pipes. Stop immediately if any pipe gives under the pressure. Yielding pipes are signs of decay and indicate a leak is likely at that point.
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Tap a wrench firmly along the exhaust system components, listening for a ringing sound that indicates the parts are not leaking. Thuds, on the other hand, signal corrosion and possible leaks. Do not tap the catalytic converter -- it will damage the part.
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Slide out from underneath the car and kneel by the car's side so you have a good view of the exhaust system. Ask an assistant to start the car and stare at the exhaust area. Check for puffs or steady streams of smoke that come out of anywhere except the tail pipe. Errant smoke release is a sure sign of exhaust leaks.
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Tips & Warnings
Most cars feature a single exhaust system; but if your vehicle has a double system, perform the same tests on each side.
Drive with the windows down, if you suspect an exhaust leak, until the problem is fixed.
References
Resources
- Photo Credit double exhaust pipe image by green308 from Fotolia.com
