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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 08-20-2010, 12:32 PM   #1 (permalink)
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whistling noise coming from engine

Hello

today when i was driving i heard whistling noise coming from engine. It usually start's when RMP get's over 2. Sound's like it coming from alternator. What could it be? it's 2001 bmw 325i.

Last edited by Nfsplayer; 08-20-2010 at 12:37 PM.
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Old 08-21-2010, 01:04 AM   #2 (permalink)
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Do you have a cold air intake by any chance? I have a Dinan CAI and mine squeals around 1900 rpm.
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Old 08-21-2010, 01:43 AM   #3 (permalink)
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Check vacuum lines, the snugness of your air filter box (does it seal) and also check the bearings in your belts tensioner.

That is what made the noise in my 330. Replaced both tensioners and no more noise.
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