Quote:
Originally Posted by zzyzzx
I found numerous people posting about air going in both directions on numerous new PCV valves, the ones purchased at local auto parts stores (Fram and Purolator branded mostly) did this. The OEM ones did not do this. My Escort runs better with the new Motorcraft one.
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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.