93 YJ Help. Oil in air filter - JeepForum.com

 
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post #1 of 7 Old 02-04-2013, 07:06 PM Thread Starter
JackNCoke
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93 YJ Help. Oil in air filter

Hey everyone I'm new to the jeep world. I recently bought a 93 YJ with the 4.0L. I went to change the air filter out, and I noticed the air filter housing was completely soaked with oil. And I mean SOAKED. So I cleaned it all out and replaced the air filter. I realized that all of the oil had come from the breather hose that leads to the valve cover. So I disconnected the hose and put a seperate filter on top of the valve cover. Then I took the jeep for a spin, and I smelled burning oil. I popped the hood and there was oil everywhere. It was coming out of the breather filter on the valve cover. Will someone please tell me why my jeep is doing this?

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post #2 of 7 Old 02-04-2013, 09:47 PM
americanjeeper
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Now was it coming out of the hole closest to the radiator? or the CCV?
I'd check the PCV make sure it is there mine was just an open chamber check to see if you're having a vacuum leak off the intake manifold check everywhere
Could be blown rings

Was the oil the front middle or the back of the air filter?
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post #3 of 7 Old 02-05-2013, 06:58 AM
Siva283
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DO the easy cheap stuff first. Take the valve cover off and clean the baffles for the CCV system in there. When they get clogged it will spit oil into the air filter. Also check to make sure you have vacuum at the line going into the valve cover. If I remember correctly it should be the one going into the valve cover closest to the fire wall. You can also do a compression test to check your rings. Someone else will have to give you instructions on the compression test though as I am currently learning that one myself.

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post #4 of 7 Old 02-05-2013, 09:13 AM
jaycal3
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I have a 93 as well and was experiencing mild blow-by, so I removed and cleaned the valve cover and baffles, resealed it and also cleaned the tubes to the breather and CCV... problem solved... sounds like your is building some serious pressure though...

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post #5 of 7 Old 02-05-2013, 10:07 AM
pasinbuy
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Jaycal and siva are right on. FYI - There is no pcv on your Yj.

Most likely the po was not oil change friendly and you have sludge in the valve cover. Clean the valve cover out. Then check.
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post #6 of 7 Old 02-05-2013, 10:28 AM
pasinbuy
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FYI No need for two threads on the same subject.
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post #7 of 7 Old 02-05-2013, 11:53 AM Thread Starter
JackNCoke
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Thanks for the replies. Yes sorry about posting 2 threads on the same subject. I'm new to the forum and didn't realize what I was doing.
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