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I have the exact problem on my 2003 z4 3.0i. I have tested this while driving to see what conditions cause it and it seems that only while the engine is in gear under light (and usually very light) load. you can hear it coming from the engine bay. It can also be produced by feathering the gas lightly at any speed.
Just thought I would throw in my 2 cents to see if anyone else is experiencing the exact same problem or slightly different.
Anyone know what this might be? power seems unaffected by it.
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