Smoke in Valve Cover - JeepForum.com
 
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post #1 of 6 Old 03-28-2012, 02:12 PM Thread Starter
1jovan2
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1987 YJ Wrangler 
 
Join Date: Feb 2012
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Smoke in Valve Cover

I have a 87 yj with a 4.2. I just noticed recently that there is some smoke inside my valve cover after is been running for a few minutes. In the top of the valve cover there is pcv valve that seems to be alright. I cleaned it with carb cleaner and made sure the parts inside of it move. In the back of the valve cover there is a tube that goes under the car and ends at the muffler. The white smoke comes out here. Along with the steady stream of white smoke there is some foamy oil that drips out of the tube.

Does anyone have any idea what might be causing this?

Thank you for your replies.

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post #2 of 6 Old 03-28-2012, 02:55 PM Thread Starter
1jovan2
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I was just looking at possible problems and I stumbled onto this thread http://www.jeepforum.com/forum/f12/smoke-cab-1270208/ . If you look at the picture someone posted in that thread you might be able to help me. I have a carburetor that is almost the same as the one in the picture but my hoses are hooked up completely different. The hose in the back of the valve cover isn't connected to the carb. It just goes under the jeep and doesn't connect to anything. The hose in the front of the valve cover has my pcv valve and it connects to the carb just under where the air filter is at the front left side of the carb.

Does anyone have a link that shows how my carb should be hooked up?
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post #3 of 6 Old 03-30-2012, 11:03 PM
CB10101
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The hose at the back of the valve cover is a fresh air inlet to the crankcase ventilation. Usually attached to the aircleaner housing after the air filter. The pcv valve hose at the front attaches to vacuum so that it sucks the hot oil vapors out of your engine and back into the intake
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post #4 of 6 Old 03-31-2012, 04:16 PM Thread Starter
1jovan2
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Thanks for the replies. The pcv valve was hooked up to the wrong spot on the carb.
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post #5 of 6 Old 04-05-2012, 05:39 AM
91yjman
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What would happen if it were backwards jw
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post #6 of 6 Old 04-08-2012, 11:11 AM Thread Starter
1jovan2
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1987 YJ Wrangler 
 
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I'm not sure what you mean by backwards. The hose from the pcv was hooked up to the wrong spot on the carb. It wasn't getting suction because of that so the crankcase would build up pressure which caused oil to come out of the breather. It was also the cause of the smoke in the valve cover.
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