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This is one of the most common Jeep problems. There are two hoses coming off of the valve cover. One goes to the air filter box and the other one goes to the intake manifold. The one that goes to the intake manifold is a vacuum line that breaks or becomes plugged easily. When that happens the air filter fills with oil. Check to see if that line is broken, if it is not then take off the end at the valve cover and take a small pick or nail and stick it into the fitting and clean out the carbon build up.

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โˆ™ 2009-01-17 03:15:29
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Q: What would cause the air filter on your 1994 Wrangler to be full of oil?
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