I am not expert enough to say what might be causing this (several things come to mind but I won't speculate), but that noise is not normal. I'd shut it down and have it trailered to a shop for a professional opinion. At this point, you want to avoid a catastrophic failure that could damage a lot of engine components.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
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Last edited by thstone; 12-22-2012 at 04:27 PM.
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