1998 GMC Jimmy engine knocking

1998 GMC JIMMY
195,888 MILES • 4.6L • 4 CYL • 4WD • AUTOMATIC
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HUSKERGUY36
  • MEMBER
  • 1 POST
When I start the Jimmy a knocking noise is present when u Rev up the engine it gets louder and faster when at idle it stays the same knocking pace gets faster as you Rev up the engine could u help me to know what this is please and thank you
Jul 16, 2015 at 10:21 PM
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HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
it may be a rod knock have a local pro listen but from your description that is what it sounds like. if you pull plug wire one at a time and knocking stops then that is the cylinder that is the problem.
Jul 16, 2015 at 10:58 PM
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