Question about 1997 Jeep Grand Cherokee

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If jeep has pvc valve - 1997 Jeep Grand Cherokee

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The 4.0 liter has a pcv orfice it is the one in the rear of the valve cover and grey still dealer only and should be changed 30,000 miles with the spark plugs. the 5.2/5.9 also has one it is in the right (thats passenger side) valve cover and needs 30,000 service also again with the plugs

Posted on Aug 22, 2010

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I have oil leaking into my air filter, when i got my oil change the guys there said that i needed to get a new pvc valve but when i called chrystler to pick one up they told be that that wouldn't do...


I would replace the PVC valve, a worn / defective unit could cause the problem you are seeing.

Do make sure the oil is not over filled, consider a heavier weight, but unfortunately, due to the age, this is also likely a high-mileage engine, so you are more likely producing much more back pressure from worn rings etc. into the valve cover causing the problem.

Older cars simply had vents on the valve covers, newer ones direct that back into the intake to reduce smog emissions.

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