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2003 BMW 3-Series 325Ci 2dr Coupe

2003 BMW 3-Series
Trim Info:
Rear Wheel Drive, 2 Door Coupe, Sub-Compact
20 mpg city / 29 mpg hwy
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March 19, 2013, 10:11 pm

Zack F

Question: what is the whistle noise?

I have a 2003 325i and just around 1500 rpms there is a very loud whistle noise.

March 19, 2013, 10:23 pm

Richard W
Expert Mechanic

You have a vacuum leak by the throttle body. Common problem with your car. You need to replace some vacuum lines. The best way to find the leaks is with a smoke machine. It puts smoke in the intake system. Then shows you where the leak is.

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