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      01-11-2016, 07:42 AM   #18
M3Bimmer77
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Drives: 2011.5 M3 E90 Jet Black
Join Date: Feb 2015
Location: West Palm Beach

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I guess yr talking about the "whistle" noise that goes along with the refs, right?

I really don't think it's the engine. Most likely it's something driven by either one of the belts or the belt by itself. One belt is for the alternator and the water pump and the second one is for the AC compressor. Turn off the AC and see if the noise stops. Also each belt have an adjusting pulley. Could be one of them as well.

My bet, according to what I can hear, the problem is on one belt or one pulley. Try spraying some belt conditioner on the belts. One at a time. Also spray some oil on each pulley. Also one at a time then check the noise. Good luck
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