Quote:
Originally Posted by 335dwanted
Big thanks to DWR for this, been using it for a while.
Interesting thing I noted the last couple of days; I actually see a vacuum reported of about 4.5 psi at very slight partial throttle but only when the car is cold. Diesels don't usually pull vacuum since there is typically no throttle, but the M57 does have an electronic throttle valve. My guess is that it is only actuated when cold, but for what purpose I cannot imagine.
Anyone else see this behavior?
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You still have a functional EGR system? If so, that's normal. The system will close the throttle to help pull exhaust gases through the EGR path and vacuum conditions can occur in some operating conditions.