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I have 2 running and driving z1s. Both had pcv valve parts in the elbows. I gutted both and I did not notice a change in the performance or idling characteristics. If they have any sort of pcv or check valve it would be the number 2 part by the breather. That contradicts your statement saying the number 2 is open. I investigated several other threads and the confusion spreads from there. I'm goin to look at both my runnin z1s and both that are sitting in my shop. If thr lower one does have a valve in it, ill gut it and run straight vaccum, and if it runs like total poo poo then I'll agree with you and say that the system was intended for a Pcv valve. It's just nobody's really sure where they are always placed.
Dont always trust dealer diagrams, I just got effed over at work by a Subaru parts diagram faxed to me. The diagram contradicted the part I received and the real part i needed was discontinued by Subaru. The parts guy at the Subaru dealer had to call Subaru direct to find out.
You aren't being rude at all. If i am wrong about it I would rather find out and admit it than keep a closed mind. I was just going by those other posts in the past and didn't really look for contradictions.
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Burn lean and prosper \\ //
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