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2004 Cadillac CTS Question: the engine intermittently makes a rattling noise when it is hot at idle.

 

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bandita, Orange Park, FL, January 10, 2013, 15:12
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the engine intermittently makes a rattling noise when it is hot at idle, usually after getting off the highway. It does not do this all the time but it IS getting worse. Anyone know what it could be and how much it might cost to repair?

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