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Question Details Asked:Apr 16, 2010 - 07:55 AMStatus:Closed
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Usually this is a loose exhaust system part. If it does this when idling as you say it will be easy to locate by getting under the car when parked and checking the sytem from the exhaust manifold back to the down pipe, catalytic converter connector pipe and muffler. Most likely it is a loose heat shield over the cat converter or a muffler hanger that has worn out. Not a major problem and easy to fix.
My older Suburban had that kind of noise twice, first time was coming from the catalytic converter which was replaced under warranty, second time was from a loose baffel in the muffler, which I had to pay for.
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