Symptom: CEL for a variety of issues:
Misfire on all 6 cylinders
Lean on bank 1 and 2

Tested:
Fuel pressure tested fine on rail
Search for vacuum leaks...

Spraying cleaner on this part revealed the leak. You can hear the idle increase when I spray near the back of the unit (closer to firewall):

I assume this is unit is not supposed to leak air.

Furthermore, when I removed it, I found the "flap" to be loose on one end. Not sure if this is expected or not.


This part number 11617544805 known as the "adjuster unit", over $200. I assume I need to order a new one.

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2005 X5 3.0 6-spd.