This engine still uses the throttle body for throttle unlike the N52 which simply opens and then uses the Valvetronic, so wondering if this is not what you are hearing since it is happening when opening and closing the throttle. Also the DISA flaps could be part of this problem, but I think mainly the throttle body is worth looking at. With this being direct injection (and have heard that they tend to be noisy) not sure how this plays into the noises being heard. Sounds like a bag of marbles rattling around in the intake!
Is this heard while driving too?
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BMW E90 330i (M) '05 (His) | (Hers) BMW E46 320i f/l (M) '03
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