M5 Expert (>4000)
Join Date: Oct 2010
Location: Cobourg Ont
Thanked 1,968 Times in 1,652 Posts
Raising the RPM will pass a car with loose chains, one that has a worn vanos hydraulic pump, and some others sorry don't remember. Those are the important ones, loose chains is common, but the second shows why you may not want to raise that rpm.
Vanos diagnosis most often comes down to inspection. I have run that test, but I really don't like the BMW programs, they are not intuitive and I never feel confident using them. As a result I don't run that test much, only when I absolutely need extra info.
If you don't have any codes or symptoms, stop running the test! If you have a reason to run the test the simple thing to do is test switch boards side for side and test again. A lot of lodgic can be applied to that simple step of switching boards.