5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
are you sure someone didn't stick a supercharger on your engine overnight? pop the hood and take a look..
You are sure its not coming from the radio, like an alternator whine? It sounds like it is from the engine bay? Have you opened the hood and had someone step on the gas while you listened to the engine? (you can also do this by yourself by pulling the accelerator cable to open the throttle body)
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