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post #1 of 4 Old 05-03-2010, 09:26 PM Thread Starter
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1981 CJ7 
Join Date: Oct 2009
Location: Round Rock
Posts: 516
Need Help Please

I have oil coming through the breather on the oil cap and into my air filter. Have always had a little over time on the filter but never actual oil in the intake. Getting enough that it leaked out the bottom of the air intake and onto the manifold. What could be causing this?

Round Rock, Texas
1981 CJ7 AMC304
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post #2 of 4 Old 05-03-2010, 09:59 PM
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1984 CJ7 
Join Date: Mar 2010
Location: wylie
Posts: 227
I think there was a post earlier from another jeeper with the same prob. I would first check the pcv valve. Although you would think it is working well if oil is passing through it, I have seen them stuck open (as well as closed). I would also look to see how much blow by is present by either taking the pcv valve off or oil cap while the engine is running. An excessive amount of blow by could mean bad rings, or an engine has not broken in yet ( if it has been rebuilt recently). I would start there first. While you have it out... it probably wouldn't hurt to go ahead and replace the pcv is only a few bucks. Hope any of this helps.

PCV valve - Wikipedia, the free encyclopedia
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post #3 of 4 Old 05-04-2010, 07:40 AM Thread Starter
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1981 CJ7 
Join Date: Oct 2009
Location: Round Rock
Posts: 516
I replaced the PCV valve about two months ago so it is new. Will look at engine running with oil cap off and see if I am getting any blow by. Anyone else have a thought?

Round Rock, Texas
1981 CJ7 AMC304
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post #4 of 4 Old 05-04-2010, 09:36 AM
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1988 YJ Wrangler 
Join Date: May 2007
Location: Moscow , Maine
Posts: 67
I would remove the rubber hose connecting the PCV to carb or cannister and make sure it is clean, most times it is plugged.
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