Oil in my air filter!!? - JeepForum.com
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post #1 of 6 Old 09-24-2008, 11:28 AM Thread Starter
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1998 XJ Cherokee 
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Oil in my air filter!!?

There is oil in my air filter. I was told it could be a bad pcv system. I havnt tried that yet but is there any other thing that it could be?

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post #2 of 6 Old 09-24-2008, 11:30 AM
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Try cleaning the CCV suction line. When it gets clogged, crankcase vapors exit through the fresh air intake line and into the air cleaner.
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post #3 of 6 Old 09-25-2008, 09:46 AM
It's the crank sensor!
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1999 XJ Cherokee 
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Jeep 4.0 has a CCV system, not a PCV system. You are probably experiencing some BLOWBY, a relatively common problem, especially on your vintage XJ. I had it on my 88 Comanche but it is really pretty easy to manage and it doesn't necessarily mean your engine is on its last leg. Use the SEARCH function for information on BLOWBY; no need to reinvent the wheel here. Good Luck!

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post #4 of 6 Old 09-25-2008, 10:36 AM
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Check out this article. I have an 88 that does the same thing. I just ordered these parts a few days ago which will hopefully fix the problem.


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post #5 of 6 Old 09-25-2008, 10:54 AM
Ed Rico
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Along with the updated CCV parts, you could also switch to a late 4.0L valve cover. It has some revised baffling to help keep oil out of the CCV lines.

-Ed Rico
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post #6 of 6 Old 09-25-2008, 11:08 AM
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Originally Posted by Ed Rico View Post
Along with the updated CCV parts, you could also switch to a late 4.0L valve cover. It has some revised baffling to help keep oil out of the CCV lines.

-Ed Rico
x2 If your lines are clogged, you will deff. get oil in the air filter. and it's not really blowby. I had an oil soaked air filter last year, bought new lines and elbows from the factory (around 30 bucks). and havent had any oil in there since.

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