Engine noise

Tiny
JPGREER23
  • MEMBER
  • 2005 CHEVROLET SUBURBAN
  • 135,000 MILES
My engine started to make a knocking noise. I removed the serpentine belt and the noise is still there. Any ideas?
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Monday, April 29th, 2013 AT 10:54 AM

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Tiny
CARADIODOC
  • EXPERT
With no other details to go on the logical guess would be a spun connecting rod bearing. By momentarily grounding a spark plug wire you may be able to figure out which cylinder has the problem. If it's a double-knock each crankshaft revolution and it goes away when the cylinder is disabled, suspect the rod bearing. If it's a single clunk that doesn't go away, (on a V-type engine), it's likely a main bearing.
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Monday, April 29th, 2013 AT 11:26 AM

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