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Old 12-06-2010, 07:46 AM   #1
Join Date: Nov 2010
Posts: 27
Oil coming out of valve cover

I have been working on my brother's 88 Wrangler 2.5 for the past few weeks. I noticed that it has been leaking/spraying oil out of the valve cover and oil filler cap. The valve cover and cap are relatively new, so I checked the pcv valve (also relatively new). I sprayed the pcv valve clean and before I reinstalled it, I tried to run a piece of weedeater string through the hard pcv line into the intake. What I found was a tube that was completely clogged. I used a piece of wire and brake cleaner to clean the tube out.

Hopefully I fixed the problem now. I also think that he has a sticky idle air control valve. How do you guys remove these things? I tried an adjustable wrench, but I couldn't get it loose. Do you guys use an oxygen sensor socket or something similar?

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Old 12-06-2010, 02:26 PM   #2
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Join Date: Oct 2010
Location: Washington State
Posts: 57
My 93 does the same thing. I'll lift up the hood after a trail run, or even just after driving and the top of the tank has a residue on it. Either the cap of the tank is loose or the rubber has erroded, or the tubing is loose. Did you found out what was wrong with yours?

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Old 12-06-2010, 02:57 PM   #3
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Location: Midwest
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Same here. On top of everything the cover nuts were loose enough I could take a few off with bare hands. I made sure they're nicely tight up, just have to finish cleaning now.
95 YJ Rio Grande 2.5L 5-speed (We're at point "A". Where is point "B"? Who gives a sh..!? )
02 Triumph Sprint RS 955i (speed junky)
04 Honda Odyssey EX (parent-mobile)
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Old 12-07-2010, 06:57 AM   #4
Join Date: Nov 2010
Posts: 27
I'll check the valve cover bolts tonight. I think the problem was mainly caused by a clogged pcv tube. I also opened the hard line that connects into the round filter that sits on the back of the valve cover.
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