My 2004 Chevrolet truck makes a knocking sound when started. When the truck warms up the knock goes away.
Sunday, January 9th, 2011 AT 7:53 PM
1 Reply
MERLIN2021
MECHANIC
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!