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Old 11-01-2011, 10:58 AM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
Originally Posted by 540indiana View Post
I believe I have found the culprit to the 171/174 issue. The vacuum jet pump behind the motor.
Originally Posted by edjack View Post
Don't know what a "vacuum jet pump" is.
Originally Posted by 540indiana View Post
It is called a "Sucking Jet Pump" (Part #1)
Here is the diagram of my sucking jet pump:
Engine => Vacuum control => Vacuum control - engine

And, here's a picture of mine:

It has three hoses. One is shown removed here on my M54 which goes from the F connector to the sucking jet pump.

If you have a simple layperson's explanation for how the sucking jet pump works, I'd be interested in the story.

PS: To the OP: What exactly was the problem you identified?

Last edited by bluebee; 11-01-2011 at 11:00 AM.
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