Quote:
Originally Posted by tmehanna
Yes, first buzz sounds the same so I guess it is the wastegate or exhaust flap actuator but actuator sounds more like it as it's clearly coming from underneath the car and not the hood. You have a second buzz 12 seconds into the video while the car is moving, does yours buzz on the move as well?
Turbo whine is normal, this is my third forced induction car and they all have it.
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The exhaust flap actuator is not located under the hood. It's located right in front of the exhaust tip. It actually serves no purpose but reduce noise/droning by opening and closing at certain RPMs.
It's really easy for BMW to replace or lubricate the actuator. But whenever I take it into the dealer, they look at me like I'm crazy because it never buzzes when they look at it. I might just remove the actuator altogether and leave the exhaust flap open. See pic below for the mod.