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      09-02-2022, 10:50 PM   #7
Scrippy
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Drives: 2011 M3 Coupe
Join Date: Jan 2012
Location: LA,Ca

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Quote:
Originally Posted by uk215m3 View Post
So pulled the AC belt and the noise & vibration is virtually gone. Reconnected and its comes back.
Also fitted the new style low fuel pressure sensor. Engine did seem a lot smoother. Though didn't fully warm up or rev it past 2000 as was only at 60c

AC pulley has about 1-1.5mm of play in it. Same as the tension pulley, also about the same amount of play. To be honest though i am not sure if this is bad or normal for both parts.

But typically snapped the upper hose overflow pipe putting fan back in... doh
That overflow pipe is an asshole! If the AC belt was your issue just replace both belts tensioners and pulleys and be happy knowing you're good on those guys for a while now. Super easy job and good knowledge for water pump, oil filter housing gasket or whatever else is in the front of the motor down the road.
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