hi, to me it chokes in the moment when a secondary injection pump quits,
I heard a metal tapping noise in that moment,is that what you're concerned about?
Otherwise I hear just a squeaking and Vanos noise.Mine is 4.4i and Vanos sounds the same as yours,no squeaks here though.
The tapping noise like that I heard only once when my e36 318 was overheating.Stuck valve?

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e53 '00 4.4i Oxford Green II Freshly rebuilt tranny(2nd one) and transfer case/front shaft
e70 '08 3.0si Sapphire Black cinnamon leather 7 seats
e61 '06 530XI Sports Touring Silver - SOLD