blowing oil
#2
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Join Date: Feb 2010
Location: gloucester va
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Year: 1990
Model: Cherokee
Engine: 4.0
its called blow by and its usually cause by needing to clean the rear pcc valve line going from the rear of the valve cover to the intake. the nipple that's threaded into the intake needs to be cleaned out also. if that doesn't stop it. make a catch can to put in the line going from the pcc valve on the front of the valve cover going to the breather box.
#3
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Join Date: May 2010
Location: Mesa, AZ
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Year: 1987
Model: Cherokee
Engine: 4.0
I had this problem and just replaced all the vacuum hoses in the area...
NAPA part numbers
BK 7151367
BK 7151366
BK 7151365
BK 7151364
BK 7151363
The bold ones have the parts that I think helped the most.
Also, if my 87 has a PCV valve, I'll be damned if I can find it. I have been told that it is integral inside the valve cover... I don't know for sure.
NAPA part numbers
BK 7151367
BK 7151366
BK 7151365
BK 7151364
BK 7151363
The bold ones have the parts that I think helped the most.
Also, if my 87 has a PCV valve, I'll be damned if I can find it. I have been told that it is integral inside the valve cover... I don't know for sure.
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#8
Member
Have you tried replacing the front valve on the valve cover, the CCV valve that connects to the air filter box. Not sure if it would be the same as my 98
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