Brian:
I need you to do something so I know where to start. Something tells me the catylatic converter may have come loose internally. As a result, you heat it rattle and if it is blocking the exhaust, it could make a whisteling sound.
Take a rubber mallot and craw under the vehicle and tap on the exhaust system. See if you can tell where the ratteling is coming from. Pay special attention to heat shields, the cat, and the muffler.
Let me know what you find.
Joe
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Thursday, December 10th, 2009 AT 8:06 AM