BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i) - View Single Post - Weird humming/"mooing" sound from exhaust side of engine? Got a video.

Dackelone · 12-19-2012, 03:50 PM

Might be your wastegate vacum actuator(s) ? The DME adjusts the duty cycle at these actuators to control boost and spool up response.

I would go consult with your dealer, since you have this video to show them.

12-19-2012, 03:50 PM	#3
Dackelone Moderator Drives: 135i Silber mit/Rot 6MT N54 Join Date: Feb 2010 Location: Bayern, Germany Posts: 13,025 iTrader: (0)	Might be your wastegate vacum actuator(s) ? The DME adjusts the duty cycle at these actuators to control boost and spool up response. I would go consult with your dealer, since you have this video to show them. __________________ Dackel's European Delivery Museum Guide 1addicts at Stelv1oPass