Oil in airbox and coming out the fill cap
12-11-2021, 10:21 PM
#16
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
What do the plugs look like?
12-11-2021, 10:48 PM
#17
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Year: 2001
Model: Cherokee (XJ)
Engine: 4.0L
Have you run the engine with the oil cap off to see what it does ? because if it looks like a old time train puffing smoke then I would say you have a ring problem .
12-12-2021, 03:45 AM
#18
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12-12-2021, 03:51 AM
#19
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What specifically was your testing procedure? All plugs out, engine warm, throttle open, # of cranks. Throw some oil in the cylinders and see what happens.
What brand of compression tester?
That's way out of specs but IMO this needs some thought re: next step.
What brand of compression tester?
That's way out of specs but IMO this needs some thought re: next step.
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12-12-2021, 02:59 PM
#22
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I did the test with a kit I got at oreillys for $45 so I'm sure it's not perfect. I had all the plugs out. Engine at operating temp and throttle opened. I did them all a few times to test for accuracy same numbers whether I did 4 rotations or 8. The plugs looked old the electrodes were white. And no problem with coolant no bubbling. No blow by when I take the oil cap off. I took the valve cover off and cut and drilled the flute tubes. I'll put some miles on it and see if I still get an abundance of oil on the filter. Also I'll make sure I keep the radio turned up 
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12-12-2021, 06:17 PM
#24
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Year: 1990
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