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      12-04-2012, 06:14 PM   #9
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Drives: '18 F80 M3 ZCP
Join Date: Jan 2012
Location: Dallas, TX

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Originally Posted by michaeldch View Post
In my case, the pace of chirping was determined by engine speed, so increasing engine speed caused the pace to increase. I think its also possible that if one of the smaller pulleys (such as the alternator) is the one causing the squeak, the pace will sound faster, even given the same engine speed (because the pulley is turning faster).
In the video, my car is running at warm-idle speeds - ~600rpms IIRC.

Lastly, it seems silly that the dealer is replacing components of the accessory belt drive system apparently one at a time. My thinking is that wear in one component indicates the likelihood that a related part is faulty - this is why I chose to replace all the routine maintenance parts at the same time.
So was your similar to the sound I posted above? Mine would increase in sound to about 1200 rpm then it would go away. No issues on WOT or any loss of power, just the noise slightly at idle and increasing to about 1200.
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