Quote:
Originally Posted by ObsessedM3C
just had her whistle on me until rpms dropped, whistle/squeal persisted for a few more seconds after that. I’ll try to get it on video next time but its happened about 4 times so far this winter.
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I reached back out to my local BMW as it has been doing it pretty often lately. They are doing some research before having me bring the car back out.
January 2023, BMW engineering told them to remove the belt and start the car to verify it is coming from a pulley, which it did eliminate the sound. They replaced my belt and belt tensioner then but that did not fix it. I am thinking it’s the lower idler pulley as I have read elsewhere on a X3M/X4M that it seemed to fix it. It’s down towards the bottom if you look at an S58 engine diagram.
If/when I bring it in this time, I am hoping they can get clearance to replace the idler pulley. It’s almost like trial and error hanging parts at this point! I will report back any update