Question about 1993 GMC Sierra K1500

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My 93 gmc pickup has no compression on 2 cylinders side by side

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Squirt some oil in each cylinder and check the compression again. If the reading goes up, your rings are shot. Next hook up a vacuum gauge and see what the manifold vacuum is doing. The booklet that came with the gauge will tell you what each possible reading means (i.e. sticking or burned valves). I would then check the engine coolant for oil, and check the oil for coolant. If you have either, you are looking at a bad head gasket in the best case, and a cracked head or block in the worst case.

Posted on Feb 22, 2009

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