View Single Post
      01-29-2013, 10:48 PM   #4
Sindarin
Enlisted Member
 
Drives: 135i
Join Date: Jul 2012
Location: USA

Posts: 46
iTrader: (0)

This?

http://www.1addicts.com/forums/showthread.php?t=796343

I've run into this on a E90 335i with N55. The damn vacuum line to the exhaust valve vacuum actuator is corrugated. If there is a leak (vacuum actuator defective or line is disconnected from actuator without plugging) it creates a high pitched whistle/beep noise. Note this vacuum line runs through the interior on its way back to the left rear of the vehicle causing the noise inside of the car.
Sindarin is offline  
0
Reply With Quote