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      05-29-2019, 10:35 PM   #1
mitchellbrown98
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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!

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      01-22-2021, 02:20 PM   #2
mitchellbrown98
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The issue

Turns out it was a bad alternator causing the noise.
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      01-22-2021, 03:17 PM   #3
Thunderguts
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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.
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