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Originally Posted by Oldsman
if those are your compression number either 1 of 2 things............head gasket is bad or rings are bad.
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Not necessarily. To properly diagnose what is causing the low compression there is at least a few more steps. To rule either in or out the rings you need to add about 3/4 of a teaspoon of oil to each cylinder. It sounds really weird but is ok. After you add the oil, rerun the compression test on each cylinder. If your compression comes up its the rings. It it doesnt come up it could be your gasket or the valves are not sealing properly which could be a result of carbon deposits or worn guides. Hope this helps.