BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
 





 

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      11-21-2019, 05:25 PM   #1
Majestic128i
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bmw 128i whining noise

I have a BMW 128i n51 sulev manual and when I start the car and start driving it (cold start) I hear a whining noise, it gets louder if you step on the gas harder. After the car gets warm and I drive it for a while, the whining noise disappears. I only get this noise while driving after a cold start. Does anyone know what the issue might be?
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      12-13-2019, 03:35 PM   #2
atomic837
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09 135i manual here.... I've recently noticed a subtle whining that is related to accelerator input.... seems to be louder on a cold start and less noticeable as it warms up. I'm guessing it's a belt or something-related, but am not sure.

I'm at 125k miles and it seems be a recent thing.

Any ideas?
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      12-13-2019, 04:08 PM   #3
dtla1
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Belt tensioner is a common issue on these cars, relatively cheap and easy fix. I think it's recommended to replace the belt at the same time.
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      12-29-2019, 10:56 PM   #4
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This ^^. Often caused by oil dripping on the belt from a leaking Oil Filter Housing Gasket (OFHG). If you see fluid around that area change the OFHG, belt, tensioner & Pulley.
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