If it is the engine you hear, then it is related to the exhaust. It could be a bad muffler, intermediate pipe, flange between converter and intermediate pipe could be broken or leaking. The best thing to do is place the car on a level spot, in PARK, engine off, and the parking brake engaged. Then, you need to craw under and inspect the exhaust system for rust, broken components.
Do this when the engine is cold so there is no chance of you getting burned on a hot exhaust.
Tuesday, July 7th, 2015 AT 7:55 PM