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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)

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Old 04-29-2010, 05:25 PM   #1 (permalink)
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Humming Sound when engine is hot

I've noticed that there is a humming sucking sound coming from the engine after I go for a drive. It is coming from the oil cap. When I remove the cap, the noise goes away, and the idle speeds up some. If I put the cap close to the opening, it is pulled towards the opening. Has this happened to anyone else? I just replaced my oil cap a couple of months ago.
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Old 05-01-2010, 08:06 PM   #2 (permalink)
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Has this happened to anyone out there?
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Old 05-02-2010, 01:51 PM   #3 (permalink)
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There is supposed to be some vacuum pressure at the cap,is it possible the seal at the oil cap is bad and allowing it to pull air into the valve cover?
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