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Check for a broken exhaust stud
Posted by andym (more from andym) on Mon, 26 Jan 2009 06:50:23
In Reply to: slight knocking...doesn't sound good...ideas?, tonystarks, Thu, 22 Jan 2009 16:24:23
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You may be hearing escaping exhaust due to a broken stud. I had this on my C900 and thought is was a rod knock or piston slap, as it was on a 200,000 mile plus unopened motor. Ends up it was just a snapped stud and leaking exhaust.
I would think that it would be louder when cold, but maybe the exhaust manifold shifts/warps when hot, giving you the noise. The fact that the noise seem to come from behind the heat shield is a clue.
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