Compression test not so good
12-27-2014, 11:44 AM
#1
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Compression test not so good
From back to front I got 170 170 155 120 90 140. This was done with the engine cold and the gas pedal to the floor. 
Last edited by scatgo; 12-27-2014 at 12:15 PM.
12-27-2014, 12:05 PM
#2
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Join Date: Aug 2010
Location: Canton, MI
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Year: 1999
Model: Cherokee
Engine: 4.0
Add a teaspoon of motor oil in the cylinder with 90 psi and try it again. If it comes up the rings are bad.
If it doesn't come up by adding a bit of oil, there may be an issue with a cracked valve, a chunk of crap stuck in the valve seat, or part of the piston ring lands blown out.
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