I would agree except that I was getting the same code (idle air mechanical fault) with the old IAC valve (the original as far as I know) and the new VEMO replacement. Seems unlikely that a brand new one is failing in the same manner as the 22-year-old version.
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Ok, so provided that the OP has corrected all of the air intake leaks. Essentially, wouldn’t the diaphragm be leaking metered air into the crankcase thus causing a rough idle or possibly even stalling?
I’m wondering if he got a defective ICV? I have personally gone through a few.
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The crankcase doesn't ever pull air into it. Air that gets through the piston rings from combustion causes positive pressure. The point of the CCV is that it sucks that air into the intake manifold, but without exposing the crankcase to the full amount of intake manifold vacuum (which is quite strong vacuum downstream of the throttle body).
I'm still not 100% convinced it's the CCV, but I figure taking the whole darn intake off will be a good troubleshooting step. May just be a goofy broken vacuum fitting. It's either that or pay an indy out the nose to troubleshoot it for me. Since they aren't getting back to me and since the E70 is driving really great I think I'm just gonna park it in the garage for a few more weeks and take it all apart and maybe get lucky.