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      09-22-2010, 03:26 PM   #19
cabro
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Drives: 2011 BMW Z4 SDrive35is
Join Date: Sep 2008
Location: Canada

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Quote:
Originally Posted by andrewn80 View Post
I have the whistle also on my 2004 z4 2.5i. It happens at low load ~2000rpm and goes away at anything higher or lower.

I checked my air intake and noticed it had a hole in the crinkle section. I was so happy to find that hole because I thought that would solve the problem. I fixed it and the noise is still there. Any other suggestions?

Did you guys fix yours?
I had a crack in the same spot and thought I fixed it as well but turns out it didn't. My mechanic seems to know what it is but I forgot the name of the part. All I remember is the part and labour is around $600. Some type of diaphragm part that has a crack in it.

I'll ask when I drop by today.
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