makes a whistling noise when I first start it up?

1998 BMW 328
105,300 MILES • 6 CYL • 2WD • AUTOMATIC
Avatar
EVELYN328IS
  • MEMBER
  • 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 9:52 PM
Advertisement
Avatar
DOCHAGERTY
  • ✓ASE Certified Mechanic
  • 9,606 POSTS
  • ASE Certified Mechanic
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 11:40 PM
Avatar
STRAILER
  • ✓ASE Certified Mechanic
  • 54,837 POSTS
  • ASE Certified Mechanic
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
Images (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Nov 22, 2024 at 4:16 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.