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Answered 2005-10-09 22:21:09

On many engines the engineers use redirected exhaust gases to quickly warm-up the engine. The valve that redirects the exhaust gas is controlled by a bi-metal spring and the valve assembly can wear out over the years and begin to rattle. It's usually on one of the exhaust manifolds. If you can find it, see if you can rattle it and if it makes a similar sound to what you're hearng.

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