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Old 11 Mar 2012, 09:47 pm
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Default 1992 Honda civic, low compression in adjacent cylinders?

So I'm moving fairly soon and trying to get this little honda running for my mom. I did a compression test and cylinders 2 and 3 kicked out under 20psi. Naturally I assumed a head gasket and replaced it, the compression has not changed. I checked the head, it was not warped or cracked. All the valves were in good shape, I even adjusted them. So I currently have a bit of transmission fluid soaking in the cylinders thinking perhaps the rings are stuck. Anyone have any other ideas?
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Old 11 Mar 2012, 10:17 pm
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You covered the main points - good work.

20 psi is shockingly low. I patched up a 1993 engine that my daughter's husband ran out of oil on the freeway, seizing the engine, and even after that abuse it still had compression ranging between 65 and 90.

The major question is whether the leak is from the cylinders to the crankcase, one of the manifolds (although your valve checks make that unlikely) or - shudder - the other cylinder. The easy way to get a feel for that if you don't have equipment for a leak-down test is to do a wet compression test with motor honey, STP, or other really thick oil additive. If the compression comes up significantly the leak must be past the rings. If not there must be a crack between the cylinders.
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