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.
aa stage 2.5
2005 BMW 330i ZHP
Black on Black
AA stage 2.5