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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > N54 belt squealing



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      09-26-2013, 09:28 PM   #1
white08135i
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N54 drive belt

Hey dudes. So I replaced my drive belt. Now when engine warms up it squeals when accelerating. In neutral or in d. The more I press the accelerator the louder it squeals. Pulleys seem to be fine so my guess would be the tensioner is not holding up well?
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      09-27-2013, 01:10 AM   #2
uaizaz
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Facing the same problem looking forward to a response. Mine does so when the engine is colder.
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      09-27-2013, 08:52 AM   #3
Chriztofor
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Replace the tension pulley and idler pulley. Search, there is a DIY on here. Note: If there is not enough tension on the belt it will slip and squeak.
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If no codes are being thrown use Chevron Techron fuel injector cleaner (concentrate). It solves rpm fluctuating upon cold start-up. Also, for most BMW problems start off by scanning your car with the Peake Research Tool. It contains the actual BMW codes. If you want to register a newly installed battery for free (just buy a $10 cable) and google/download BMWLogger
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      09-27-2013, 08:55 AM   #4
white08135i
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Quote:
Originally Posted by Chriztofor
Replace the tension pulley and idler pulley. Search, there is a DIY on here. Note: If there is not enough tension on the belt it will slip and squeak.
So it's a possibility that within time plastic pulleys wear out? Could it be the spring on the tensioner? I noticed when the car is cold it doesn't squeal, but 2-3 minutes into driving it starts to make the noise. I'm thinking when tensioner gets to a certain temp it fails to hold ?
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