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      08-18-2008, 01:43 PM   #1
fetalsono
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Drives: 2008 535i
Join Date: Aug 2008
Location: San Francisco

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Harmonic humming noise driving me crazy-Help

I have a 2008 535i with 9000 miles. The first 6000 miles were great. At around 6000 miles I had to have the fuel pump replaced (apparently I am not the only one). At around 8000 miles I started to notice a low level alternating humming noise that would continuously go on and off - hard describe in words but like nnnnn pause nnnnnnnnn pause. It didn't relate to my driving fast slow, etc. I brought it in twice to two different dealers and both heard the noise which they agreed was disconcerting but could not find the cause. They said they heard it on similar 535i's they tested. I found a post that talked about the turbo actuator failing around 10,000 miles. I don't know if this is the same thing. That noise in the post is said to be rattling. Anyway I am bringing in the car once again on Thursday to look at it. Maybe this is coincidence, but I have had to add oil 3 times in 9000 miles as the oil light went on and went off once the oil was added.

Anyone with any suggestions
Thanks

Peter
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