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Unread 04-09-2014, 10:10 PM   #1
csamanie
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Oil passing through PVC valve over to air filter

Came home today and saw oil under neath the "94 Wrangler with a 4.0L H.O.. The oil was coming from the air filter box and the filter was covered with oil. Would this indicate a bad PVC valve, or something else a bit more drastic. Along with the PVC valve on the valve cover, there is another valve similar to the PVC valve, but located further back towards the fire wall. Is this some type of vacuum valve? Any advise on what to look for as being the problem would be greatly appreciated.

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Unread 04-10-2014, 01:38 AM   #2
Wyogunman
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I've never had oil make it to the ground but oil on your air filter is normal. I just changed mine today and it was soaked.
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Unread 04-10-2014, 02:40 AM   #3
jsawduste
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Quote:
Originally Posted by Wyogunman View Post
I've never had oil make it to the ground but oil on your air filter is normal. I just changed mine today and it was soaked.
NO that is not normal.

I am sure you will get someone with more patience to answer your question. I`ve done it too many times to do it again.
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Unread 04-10-2014, 07:33 AM   #4
gotswap
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Time for a compression and leak down test.......
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Unread 04-10-2014, 08:02 AM   #5
jaycal3
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Quote:
Originally Posted by Wyogunman View Post
I've never had oil make it to the ground but oil on your air filter is normal. I just changed mine today and it was soaked.
Normal??? No, its not normal. You say the oil on the ground is coming from the air cleaner box?? Are you sure? Check your valve cover - there are baffles on the inside that get gummed up and doesnt allow it to breath... also check your PCV to make sure its not stuck or gummed up as well. I would be concerned if I saw oil from the air box dripping onto the ground. Many people have a bit of oil staining on their air cleaner but either way you are not supposed to. It would be helpful(always is) to add a picture of what it is you are seeing as well.
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Unread 04-10-2014, 08:50 AM   #6
Old4X
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There is no "valve" in the 4.0, just a metered orifice in one of the lines.

Both lines must be free and open, the vacuum fitting must be clear, and the baffle in the valve cover must be free and clear. If these aren't all correct, you get oil in your air filter
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Unread 04-11-2014, 07:43 AM   #7
92yjwoolf
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Had the same problem, was getting a lot of blow by, tore engine apart and 2 pistons had broken rings!
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Unread 04-11-2014, 09:31 AM   #8
Sagerist
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Yup, i had that same issue. Cleaned out the vacuum lines going from the PCV to the carb. Also cleaned out the CCV lines going from the back of the engine to the air filter box, which is where you oil should be coming from.
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Unread 04-11-2014, 03:04 PM   #9
csamanie
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First off thanks to all who took the time to reply to my question of the oil staining my air filter to the point of oil dripping onto the ground. I removed all the air and vacuum hoses and cleaned them making sure they were not plugged. I then blew air through each hose to make sure they were clear. I purchased a new "PVC" valve from the Jeep Dealer, which I was told it is not really a PVC valve but a valve with a small orifice. The baffles underneath the valve cover were a little cruddy and so I vacuumed as much crude as possible with a vacuum pump. The only thing I can think of now is that the old metered valve was somewhat plugged and did not allow a flow of air and vacuum through the whole system. I will continue to check the air filter regularly and see if the oil reappears again.
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Unread 04-11-2014, 03:15 PM   #10
jaycal3
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Honestly, I would remove the valve cover and completely clean those baffles before reinstalling... I'm not sure that the vacuum pump was able to get them the way they need to be cleaned... But good luck!

Sent from my iPhone using JeepForum... So excuse the typos, my iPhone is challenged.
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Unread 04-11-2014, 03:49 PM   #11
Sagerist
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^^^ This. Mine was completely blocked from years of crude from the PO and the only way to get it out was taking the valve cover off and getting in there. There are spots you can't even get to with the cover on.
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