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)
I just purchased a '92 525i and noticed that the there is some sort of whirring noise coming from the engine. It is constant from the moment the car is started and does not increase in intensity. not particularly loud as it is drowned out when accelerating mostly noticeable when idling or cruising and rpms are low. Occasionally does not make the noise right after starting but will start within a couple minutes. Any idea what it might be?
Are you sure that's not just the alternator charging that battery up after starting the engine?
He said it will stay on. If it was simply the alternator charging up, it would not be a continued noise, unless there was an issue with the alternator, in which there would be a resulting number of other issues.
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