Quote:
Originally Posted by AleroB888
It could be that the PCV valve is designed to allow a little backflow, so it won't have a tendency to stick shut when going from deep vacuum conditions to zero vacuum.
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I had thought about that, but the reports I found on the internet suggests that the aftermarket PCV valves are just crap. It's not just the Motorcraft PCV valves that were doing this, all OEM ones were, irregardless of manufacturer. That and cars tended to idle better (less surging while at a stop light and stuff).