A wet compression test is used to indicate if low cylinder pressures are caused by worn piston rings only. The test is done exactly the same as the “dry” test, however a small amount of engine oil (about 1-2 teaspoons) is added into the cylinder to create temporarily seal (to prevent possible blow-by). If compression rises significantly afterwords, then worn piston rings are the culprit.
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Jason Montague New MemberLifetime Supporter
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You warmed up the motor prior to this test?
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Minidave Well-Known MemberLifetime Supporter
Nothing wrong with that compression - the important thing is that it's fairly even across the board and well within spec. #3 is a little low, but not horribly so.....could just be a tight valve that needs adjusting. (Or are those hydraulic in 2004?)
I say drive her another 100K and check it again! -