What is the inside of the pcv valve look like and is there any type of movement with the inside piece.
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pcv valve
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Not to be picky but it's a PCV valve (Positive Crankcase Ventilation).
All the ones I've seen are basically just a metal "slug" inside a casing. The slug acts as a valve. When engine vacuume is high enough it pulls the slug against the inside of the valve and blocks flow.
Sludge can build up in them and prevent it from working properly, and I imagine over time the mating surfaces could wear reducing it's ability to seal.
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