Quote:
Originally Posted by blykins
Most of your "elevated" crankcase pressure is going to be at WOT. At that setting, your PCV is not creating negative pressure.
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Exactly- Which is why a PCV system will always have a vent line on the other valve cover going to the air filter, or through a filtered breather.
PCV only opens the valve and pulls the vapors out when engine vacuum is high.
When engine vacuum is low (WOT) the positive crankcase pressure is venting out the non-pcv fitting(s) in your system.