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Originally Posted by stepjam
Would a faulty EGR valve cause this?
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No. The PCV system is not a dead-end system. there is suction at one side, where the PCV valve is, and a vent on the other side, to allow air in. Otherwise, it would create a vacuum in the crankcase like you are seeing. The idea is to create an air flow through the crankcase, and pull vapors out to be recycled through the intake.
Need to find the vent, an unblock it. I believe it comes into the duct between the MAF and the throttle plate..
I'll go look at mine.