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Discussion Starter · #1 ·
When the engine gets up to temp and only at idle. I hear a knocking noise. but the strange part is, it sounds like it is coming from the exhaust cam gear or the back metal part of the timing cover. I pulled the plastic timing cover off and used a stethoscope to listen to the engine all over i do not here it in the water pump, block, head, or valve cover. but when I put it on the metal timing cover its loudest. I made sure that the cam gear bolt is tight and they are. I have no idea were the noise could be coming from. Has anybody experienced this before or have any other ideas what it could be?

cracked exhaust cam?

when the engine idles cold i do not hear it and any rpm over 1200 I do not hear it either hot or cold.

Only at hot idle??????
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