Truck knocks only when idling??

1994 CHEVROLET S-10
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MRSKGILL06
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  • 1 POST
What can cause a 1994 chevy s10 automatic knock only when it's idling but not when you mash the gas??
Feb 9, 2011 at 9:05 PM
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FIXITMR
  • ✓Experienced Mechanic
  • 9,989 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.
Feb 9, 2011 at 10:13 PM
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FIXITMR
  • ✓Experienced Mechanic
  • 9,989 POSTS
bad harmonic balancers are known to knock at idle also. and dont forget transmission flywheel knock from crack or loose bolt.
Feb 9, 2011 at 10:48 PM
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