Hi there,
If your mechanic is sure that the exhaust is "gas tight" there is one place that it might be coming in. Is your exhaust tail pipe under the body or external, where it should be. If it is tucked under the body the low pressure zone of the body can suck in fumes. Also if your car is a station wagon, make sure that the tail gate seals are in good condition as the same thing can happen.
Mark (mhpautos)
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Wednesday, December 19th, 2007 AT 2:48 AM