what causes low engine pressure

Asked by Jan 23, 2017 at 07:46 AM about the 2003 Chevrolet Avalanche 1500 4WD

Question type: General

1 Answer

124,545

Your piston rings are worn (allowing air/fuel to leak past the piston during compression). The intake or exhaust valves are not sealing properly, again allowing a leak during compression. There is a hole in the cylinder.

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