Question about 1993 GMC Suburban
The cylinder fires but low compression in hole 5.
There are a few things it could be. compression rings around the piston, bent exhaust valve, or bad exhaust valve or seat, or bad head gasket. I would start with cylinder leak down test, that will rule out a couple of those. Depending on mileage, the more common seen on high mileage chev are worn rings.
Posted on Oct 09, 2009
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Posted on Jan 02, 2017
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