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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > F31 B47 idle noise
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      10-27-2024, 07:53 AM   #1
bimbalasbimbalas
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F31 B47 idle noise

Hi, any ideas what can cause this noise on idle? It's not air filter box and not engine cover, I checked it.
Here is youtube link: https://youtube.com/shorts/4brm504h_...QbPCfumQLusHFk
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      11-03-2024, 02:36 PM   #2
bimbalasbimbalas
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Any ideas???
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      11-04-2024, 09:55 AM   #3
PETED678
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Hard to know, have you opened the bonnet and had someone press the throttle to locate where it’s coming from? As it could be anything to a loose shield or something engine wise

Any codes?
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      11-04-2024, 10:01 AM   #4
bimbalasbimbalas
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No codes, there is almost no noise from the outside. It gets way worse when outside tempersture is low and engine is cold. It's not washer fluid reservoir and engine cover. Looks like the noise is comming from under the dashboard. Next I will check engine and gearbox mounts.

Last edited by bimbalasbimbalas; 11-04-2024 at 10:02 AM..
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      11-04-2024, 03:05 PM   #5
PETED678
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Engine mounts are prone to suffer, you can rock the engine and see if there is excessive movement, having done this job myself you’ll need a support bar!

Gearbox mounts should probably be done at the same time
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      11-17-2024, 04:19 PM   #6
MatthewScarn
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Ever figure it out?
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      11-18-2024, 01:25 PM   #7
bimbalasbimbalas
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Few mechanics listened, one said might be crankshaft pulley another said might be engine mounts. Still didn't change neither one, so can't confirm. Noise is still there
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      12-14-2024, 12:42 PM   #8
bimbalasbimbalas
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Problem solved! Replaced engine mounts and noise is gone.
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