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Old 01-19-2009, 02:06 PM   #1
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Oil blow back 1995 wrangelr yj

I'm getting oil spraying out by the dip stick on my 4 cylinder yj. 135K miles. My K& N air filter has lots of oil on it. I tried to pull the pcv valve (some call it a ccv valve) out and it cracked. I will put a new one in tonight when I get home from work. There was even a little bit of oil in the hose coming out of the valve on top of the valve cover. Anyone have any ideas. Can a bad pcv cause this problem or is it engine trouble.

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Old 01-19-2009, 05:25 PM   #2
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there's no pcv valve, and that thing you pulled out can be a pain to put in sometimes. but the pcv passages get clogged with carbon and sludged up oil, remove and replace or clean them. also k&n filters cause more problems on jeeps than anything. jeeps air intake is not very restrictive compared to cars and such, really not worth it. i'd switch it back.

oh, and welcome to the forum.

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Old 01-21-2009, 06:33 PM   #3
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Thanks for replying back. I replaced the ccv from the top of the valve cover. (It was difficult to get back in). There was some oil in the hose going back to the air filter. I went to the car wash and sprayed the area of the motor that had oil on it. Is it very good to run the vehicle much with the dirty K& N filter? I hate to put a new air filter on and then have more oil on the filter if I've got more problems. Any suggestions?
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Old 01-22-2009, 05:07 AM   #4
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Quote:
Originally Posted by jpdocdave View Post
there's no pcv valve, and that thing you pulled out can be a pain to put in sometimes. but the pcv passages get clogged with carbon and sludged up oil, remove and replace or clean them. also k&n filters cause more problems on jeeps than anything. jeeps air intake is not very restrictive compared to cars and such, really not worth it. i'd switch it back.

oh, and welcome to the forum.

Can you please explain the problems with Jeeps with K&N air filters because I have not heard of them. I could see a over oiled k&N filter causing problems on a engine with a Mass Airflow Sensor buy Jeep YJ's don't have them.
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Old 01-22-2009, 07:17 AM   #5
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i'm only goin on what everyone says on here. i'd never use one cuz its not worth it. most of the complaints are with the lack of particulate filtering. oil gets contaminated quicker and so on.
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Old 01-23-2009, 01:38 PM   #6
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I have never heard of that before either. Better air flow is not going to cause problems.A dirty K&N will flow better than a clean oem. I run a wastewater treatment plant and I use the same type of filters on almost 50 different types of equipment mostly blowers and there is a drastic improvement on air flow. This equals better operating equipment and better volumetric efficienty

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