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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 > Abnormal loud noise under hood when engine off, power still on
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      11-01-2018, 08:43 PM   #1
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Question Abnormal loud noise under hood when engine off, power still on

*Wanted to post this here for maximum exposure before it gets moved by Mods*

Got a new 440i, it's only got a little over 500mls on it. The car has been noisy since day one, but I'm use to that with BMWs. This however is nothing like I've ever dealt with before. Here's the scenario, after a drive if I power off the engine, but leave the power on (i.e. radio on, iDrive etc.) I get this really loud noise that sounds like electric buzzing, whirling, oscillating noise coming from the engine bay. Popped open the hood and I can hear it from the driver side under the engine shroud. Sometimes it's really loud and other times just loud. Either way, you hear it very clearly and it's really annoying and clearly not normal. If I hit the Start/Stop button to power off the car it stops immediately.

Planning on taking it in to be looked at, just curious if anyone else has run into this. Searched the forum, but couldn't find anything.


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      11-03-2018, 09:05 AM   #2
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Electric fuel pump. Look around, I believe there are threads.

Good luck.
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      11-04-2018, 01:16 AM   #3
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Same. I figure one day it won't make it anymore and then I'll truly find out what it is and where it's located.
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