Truck knocks only when idling?

MRSKGILL06

MEMBER
1994 CHEVROLET S-10

What can cause a 1994 chevy s10 automatic knock only when it's idling but not when you mash the gas?

Thursday, February 10th, 2011 AT 5:05 AM

2 Replies

FIXITMR

MECHANIC
9,990 POSTS

Could be a piston knocking. Or maybe cam? Or maybe your bearings are worn and oil pump is weak at idle? Chevys never did have great oil pressure to begin with.

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Truck knocks only when idling?

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