Engine noise

2005 CHEVROLET SUBURBAN
135,000 MILES
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JPGREER23
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  • 1 POST
My engine started to make a knocking noise. I removed the serpentine belt and the noise is still there. Any ideas?
Apr 29, 2013 at 10:54 AM
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CARADIODOC
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
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.
Apr 29, 2013 at 11:26 AM
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