Quote:
Originally Posted by Bdc101
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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You’d be surprised at the numerous times brand new parts arrived DOA over the many years of my automobile ownership. LoL..
Quote:
Originally Posted by Bdc101
IThe 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).
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I’m not suggesting the crankcase pulls in air. I’m trying to convey that a failing CCV can over pressurize the crankcase.
Quote:
Originally Posted by Bdc101
II'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.
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A smoke test would be most effective in finding a stubborn leak. But since you’re going to go through everything again, you may have a decent chance at solving the problem. Since vacuum seems to be the topic here, I’ve got a link that may help.
https://signalwires.com/bmw-m54-vacuum-diagram
I hope it all works out for you. I never like to see a fellow member in distress.
E53 RiPPeR
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ReVELaTiON 22:21