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Old 03-25-2012, 10:10 AM   #1
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Oil! Rear Breather Tube!! Help!!!

Okay, I have replaced the rear "breather tube" on the valve cover on my 2.5L 97 wrangler. When I bought the jeep, it had a cold air intake on it, that the fella put on it before he sold it to me. Well, about 5 months into owning it, I noticed that it was starting to run kinda weird, so I started investigating. Ended up finding oil in the Cold air intake coming from the hose that ran from the breather tube at the rear of the valve cover. So I unhooked the hose from the breather tube and just let it go off the side of the engine, I dont have alot of oil coming out but some is being pushed out. At first I thought the Cold Air Intake was pulling air so hard that it was pulling oil through, but there is still some oil coming out. I have taken the valve cover off and tried cleaning everything out and spraying cleaner into the front "valve looking thing" at the valve cover that has a hose running into the intake under the throttle body. I am staring to believe I need to replace that piece, but I have NO IDEA what it is even called. When I cleaned it out, it was a little clogged, so I might be able to clean it a little more. Anyone have ANY SUGGESTIONS, I know this cant only be a problem I am having! I really do appreciate everything you guys have already helped me with!

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Old 03-26-2012, 09:01 AM   #2
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Any help at all? Figured someone would know what's gong on

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Old 03-27-2012, 12:44 AM   #3
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cant believe no one at all has chimed in with an opinion or answer...surely I am not the only one with this problem
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Old 03-27-2012, 01:06 AM   #4
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Have you checked the oil level in the diff? It should be just to the bottom of the stock fill hole. If you have an aftermarket diff cover, the hole will be higher but don't fill it that high, because it could leak. I would make sure your diff oil is at a proper amount, because too much could cause overflow
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Old 03-27-2012, 02:44 PM   #5
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The tube on the back of the valve cover is the intake for the positive crankcase ventilator. air should be going into it. the fact that you are getting oil from it tells me the positive crankcase ventilator ( thats the other tube on the front ) is not working. It takes fumes from inside the engine and routes them to the intake manifold. sounds like the small orifice that screws into the valve cover is plugged or maybe so is the hose . good luck
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Old 04-07-2012, 11:16 AM   #6
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Quote:
Originally Posted by dmjacobs
The tube on the back of the valve cover is the intake for the positive crankcase ventilator. air should be going into it. the fact that you are getting oil from it tells me the positive crankcase ventilator ( thats the other tube on the front ) is not working. It takes fumes from inside the engine and routes them to the intake manifold. sounds like the small orifice that screws into the valve cover is plugged or maybe so is the hose . good luck
Thanks bud, I actually took the valve cover off and thoroughly cleaned everything! Replaced and everything seems to be going good so fingers crossed! Tired of dealing with the engine problems, I need to start fixing front wheel bearings!
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Old 04-07-2012, 12:23 PM   #7
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From the amount of oil and air flow you're getting through that tube, it sounds like there might be some blow-by from the engine which is caused by bad piston rings.

And there is no more air flowing through that CAI than there is through the stock OE air filter system. The engine pulls the same amount of air no matter what air intake is on... no air intake can force more air to flow than the engine is asking for.
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Old 04-07-2012, 12:58 PM   #8
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Originally Posted by jeepwayoflife View Post
Have you checked the oil level in the diff? It should be just to the bottom of the stock fill hole. If you have an aftermarket diff cover, the hole will be higher but don't fill it that high, because it could leak. I would make sure your diff oil is at a proper amount, because too much could cause overflow
Huh?!?
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Old 04-07-2012, 01:17 PM   #9
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Huh?!?
Hahaha yeah, not worded the best just listen to Jerry
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Old 04-07-2012, 03:47 PM   #10
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Quote:
Originally Posted by DevilDogDoc

Huh?!?
Thanks fellas, hopefully my degreasing and cleaning the entire valve cover and ports on the valve cover, I think I've got it tamed lol. So far so good there.
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Old 04-07-2012, 05:43 PM   #11
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Nope, don't stop yet...Check to see if you have bigger problem sneaking up on you.

Remover air cleaner tube, and hoses on top of valve cover while engine still warm...start engine and rev it...observe if you get lotsa smokey gases belching from hose connections on valve cover......If you do, you are getting lots of blowby at the rings and that puts a load on PCV system...Your rings are very worn and compression gasses and venting into crankcase and traveling up to valve cover where they carry lots of oil vapors with them. From there they get sucked into intake and burned inside engine.

Even new engines produce some gas and oil vapor, but PCV is designed to deal with it until it gets to be too much and stuff starts getting clogged. When really worn, the oil vapors collect in intake and condense into puddles of oil.

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