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Old 11-17-2007, 03:32 PM   #1
Join Date: Jul 2007
Location: San Diego
Posts: 24
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PCV help!!!!

I have a 1990 Wrangler, I6 258 and I live in California so it has a million vacuum lines on it !!! Anywho...I am getting oil leaking out of the oil filler cap on the valve cover. I've removed the PCV solenoid (since it was supposed to be removed in 1994 as per a vehicle recall) and I've replaced the PCV valve. According to my Chilton's manual, if I take off the PCV valve and put my finger over it, should be good suction and there is. Next step says to remove crank case intake air cleaner and cover the opening in the rocker cover with a stiff piece of paper and it should be sucked down with considerable force. This is not happening, in fact the opposite is happening and oil is getting in my breather assembly. Then it tells me to remove the carburetor and run a hand drill through the passages to dislodge any debris. I did this and after putting it all back together, still does the same thing. Anyone have any suggestions?? I also noticed when I had the carb off, down in the intake manifold there is a round piece of metal with a bunch of little pieces of metal sticking up off of it (can't think of any other way to describe it...accept maybe a steel porcupine?? LOL). Anyway, about six or seven of those little metal rods have broken off and are nowhere in sight. Any help on that one?? Thanks!!

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Old 11-17-2007, 04:26 PM   #2
Join Date: Sep 2007
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i talked to a jeep tech and he said that the pcv valves on these HAVE to be the plastic ones that came from the factory and the metal ones wont work....wont solve your prob. but u can check ur pcv valve

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Old 11-17-2007, 06:05 PM   #3
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I don't think the PCV valve is the problem. It has good suction like it's supposed to. How does the air get "sucked" into the valve cover from the breather assembly? I know it goes through the air filter and the small filter inside the breather assembly but mine isn't doing that.
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Old 11-19-2007, 03:59 PM   #4
Join Date: Oct 2007
Location: san antonio tx
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I hope some one helps you as i have the same problem with my 90 6-258
I have changed the pcv no help, checked routing of vac lines.
Timed the engine, it seems there is blow by, but it does not smoke.I am going to do a compression ck after dec. 05-2007. that is when the work is finished for the year. It runs good at 70 mph no problem, it has me baffeled. Good luck.
P S the carb. and head is overhauled, as like new
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Old 11-19-2007, 09:13 PM   #5
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Someone told me to check the baffles inside of the valve cover. He said if they are all gunked up, it will cause this problem. Since there is no positive ventilation, pressure builds inside the crankcase and causes the gaskets to expand, as well as oil to be forced out of the oil fill cap. He is actually doing some carb work for me and as soon as he is done, I'm pulling the valve cover and cleaning it out really good. Hope this helps you.
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