Chances are the heat shield on the catylatic converter or other section of the exhaust is loose and vibrating. Take a rubber mallot and tap in the exhaust system to locate where the sound is coming from. If there is nothing you can see that is loose, tap on the catylatic converter to make sure the insides didn't come loose.
Let me know what you find.
Friday, July 24th, 2009 AT 11:32 PM