The more I listen to this, the more it sound like it's engine bay. Have you had someone turn the key while you examine the engine bay, perhaps near the throttle, at the same time this sound is heard?
I got a cd stuck in my drive ones, it sort of sounded like that, but it popped out, doesn't sound like you have that issue though.
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02 E39M5 | TiAg/Schwartz | Tubi Rumore | Ultimate Ti Pedals | E60 SSK | Jim Blanton 3.45 40/100% | Coby Alcantara | StrongStrut STB
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