My 2004 Chevrolet truck makes a knocking sound when started. When the truck warms up the knock goes away.
Jan 9, 2011 at 7:53 PM
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MERLIN2021
CAR REPAIR CONTRIBUTOR
17,250 POSTS
Usually it's either the crankshaft journal or bearing, or a connecting rod/wrist pin on one or more cylinders. After the oil pressure build sufficiently the knock diminishes, but if a stethocope is used, the knock is still present!