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I recently ordered and replaced the belt, tensioner and idler pulleys (the package seen here from ECS Tuning) on my 2011 135i and I still have a belt squeak at around 1500+ RPM's. I know it's the belt because when I spray water on the v side of the belt while it is running, the noise temporarily goes away. I've re-ordered another tension pulley from ECS thinking the one that they sent was faulty (unlikely) and I've done the OFHG. There is no visible sign of oil on the belt or anywhere around the belt. Any ideas why I'm still getting a squeak?
Also have installed OEM alternator and AC compressor in the last 1k miles that didn't solve the problem.
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