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Old 12-30-2012, 02:16 PM   #1
Registered User
Join Date: Jan 2012
Location: Milwaukee, Wisconsin
Posts: 15
My Ride: 05 330i ZHP
Bad AA Diverter valve?


I have been trying to track down a possible vacuum leak. I have been getting a "idle speed implausible, air leakage" code. I clear it and it comes back in a day. I did several boost leak tests without finding anything. Today I did a smoke test with a home made smoke machine (glow plug and mineral oil). The only smoke leak I could find was one out of the back of the diverter valve, the port that vents to atmosphere. My understanding is that that is there to allow the diaphragm/spring to move up and down as necessary. If that is the case and I am getting smoke out of it, could the diaphragm be torn??? Any ideas would help.

Engine Code Idle speed implausible, air leakage
High idle - 1000rpm
Idle hangs once clutch is pressed, hangs at 1300 or so for about 2 seconds before seddling down to 1000rpm.

Set up
05 zhp
aa stage 2.5
2005 BMW 330i ZHP
Black on Black
AA stage 2.5
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