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Rough engine vibration sound while idling

(1999 Ford Explorer)
in Rogers, AR on September 28, 2011
This issue has been happening since i purchased the vehicle new 12 years ago and has never been fixed. Now that I drive the vehicle (wife got a new car), it's really annoying. While idling, the engine makes a loud vibration sound. It sounds like it's coming from the exhaust pipe from the engine or catalytic converter. A slight tap on the accelerator to up the RPMs and the vibration goes away.
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Popular Answer
of Greg Solow's Engine Room on September 28, 2011
It could be many things, unfortunately and without hearing the noise first hand or being able to do some basic diagnostic tests or be able to drive the car, its hard to say what the source of the noise may be.My guess is it may be as simple as a bad exhaust heat shield that may be as easy as a tack of weld or putting a large hose clamp around the heat shield to eliminate the noise.
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