makes a whistling noise when I first start it up?

1998 BMW 328
105,300 MILES • 6 CYL • 2WD • AUTOMATIC
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EVELYN328IS
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  • 1 POST
I have a '98 328is BMW that makes a whistling noise when I first start it up, then continues this for a couple miles. What could be causing this noise? Thank you for your time.
Dec 16, 2007 at 1:52 PM
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DOCHAGERTY
  • ✓Experienced Mechanic
  • 9,606 POSTS
The deflection pulley is notorius for doing what you describe, it is the pulley that is on the bolt for the alternator
Dec 18, 2007 at 3:40 PM
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STRAILER
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  • 55,691 POSTS
This can be the idle control valve hose leaking which will make a whistle noise as the valve opens when the engine is cold. Here is the location so you can check it out. Check out the images (below). Let us know how it goes
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Nov 22, 2024 at 8:16 AM
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