2009 128i making rubbing/grinding sounds at idle

mitchellbrown98 · 05-29-2019, 09:35 PM

After the car warms up, I've recently noticed this grinding/rubbing noise coming from the engine only when the car is idling. If I raise the rpms even by 100 the noise goes away, and I do not notice it all when driving.

If I turn the wheel slightly I notice the noise gets slightly worse.

I'm wondering if it is the belt tensioner or another pulley with a shot bearing that is causing the noise? I can't seem to find anything else rubbing.

I've linked a video of the noise as well, any suggestions as what it could be would be greatly appreciated!

mitchellbrown98 · 01-22-2021, 01:20 PM

Turns out it was a bad alternator causing the noise.

Thunderguts · 01-22-2021, 02:17 PM

Good to know. How many miles/kms? I'm hoping my most of my accessories are good for at least 150-200k miles. I imagine the starter will be the first to go.

05-29-2019, 09:35 PM	#1
mitchellbrown98 New Member 8 Rep 14 Posts Drives: 2009 BMW 128i Join Date: May 2016 Location: Calgary iTrader: (0)	2009 128i making rubbing/grinding sounds at idle After the car warms up, I've recently noticed this grinding/rubbing noise coming from the engine only when the car is idling. If I raise the rpms even by 100 the noise goes away, and I do not notice it all when driving. If I turn the wheel slightly I notice the noise gets slightly worse. I'm wondering if it is the belt tensioner or another pulley with a shot bearing that is causing the noise? I can't seem to find anything else rubbing. I've linked a video of the noise as well, any suggestions as what it could be would be greatly appreciated! __________________ 2009 BMW 128i
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01-22-2021, 01:20 PM	#2
mitchellbrown98 New Member 8 Rep 14 Posts Drives: 2009 BMW 128i Join Date: May 2016 Location: Calgary iTrader: (0)	The issue Turns out it was a bad alternator causing the noise. __________________ 2009 BMW 128i
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01-22-2021, 02:17 PM	#3
Thunderguts Captain 776 Rep 992 Posts Drives: 2009 128i Sport MT Join Date: Jul 2018 Location: DFW iTrader: (0)	Good to know. How many miles/kms? I'm hoping my most of my accessories are good for at least 150-200k miles. I imagine the starter will be the first to go. __________________ Official BMWP Whore - BMWP suspension kit w/ M3 arms, BMWP big brake kit, BMWP intake w/Mishimoto tube, BMWP exhaust, BMWP carbon strut brace, BMWP short shifter, and BMWP carbon spoiler. OZ Leggera HLT w/ 245 square setup.
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