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I'm pretty sure it's closed at idle, otherwise it would act like a big vacuum leak.

That is real easy to check, start your motor up, pull the PCV out and put your finger over the hole in the bottom of the PCV and let us know if your motor speeds up or slows down blocking the PCV Let us know your results



Of course it's going to speed up. It's a vacuum leak at idle. Most of them have an orfice to leak at idle regardless of vacuum.

Pull the pcv from cover, hook up a vacuum gauge to another port and observe what the gauge does when the pcv is attached, attached and covered and completely unplugged. Those observations should get you in the area of how it works and whether it's closed or open at high/idle vacuum situations.