Quote:
Originally Posted by BMWM.D.
The vacuum pump is what supplies the vacuum needed to operate the wastegate actuators. If the pump isn't putting out what it should (25-30 in. hg), then the wategates might not close as they should.
I've personally never seen an N54 vacuum pump fail, but I guess anything is possible. Testing the vacuum control system is very easy if you know how the system works and what readings to look for.
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Thank you for the knowledge on this. I have zero mechanical skills I am going to have to rely on the dealer on this one.
But kind of like you said this is a first I have heard anything like this, and if it has come up on the forums before I have never seen it.
Just hoping it is on the up and up from the dealer and they did not botch a turbo install and say they need to replace something to get there money for labor needed to work on the turbos again.