M340i high pitched sound after hard driving?

SemtexGT · 08-13-2020, 11:31 PM

Hello!

I have my M340i for about a month now and I've put about 3000 miles on it, runs like a dream, but I've noticed this 3 times already, after I drive it hard and the engine gets hot I hear in the cabin a wierd high pitched sound, like a kettle on the stove or something like that, which doesn't necesarilly seem to have any connection with the rpm I'm at.

Anyone have any ideas what it might be? Thanks for the help!

themnmd · 08-14-2020, 07:10 AM

While still running or after turned off? Only thing I have heard is fan after turning off. Have you opened the hood to look for coolant leaks? I was thinking a steam leak from a hose or on coolant system? Also is AC on or off

SemtexGT · 08-14-2020, 07:57 AM

Quote:

Originally Posted by themnmd

While still running or after turned off? Only thing I have heard is fan after turning off. Have you opened the hood to look for coolant leaks? I was thinking a steam leak from a hose or on coolant system? Also is AC on or off

Hi! Only when it is running, when I turn the car off it disappears and doesn't seem to have anything to do with the AC because I hear it even when I turn the AC off. I'm going to check for leaks. I opened the bonnet a few times before noticing this and saw some milky stain spots on the engine cover... could it be coolant?

When I saw it I thought it might be coolant, but the car didn't throw any codes, so I didn't think much of it

themnmd · 08-14-2020, 02:44 PM

Quote:

Originally Posted by SemtexGT

Quote:

Originally Posted by themnmd

While still running or after turned off? Only thing I have heard is fan after turning off. Have you opened the hood to look for coolant leaks? I was thinking a steam leak from a hose or on coolant system? Also is AC on or off

Hi! Only when it is running, when I turn the car off it disappears and doesn't seem to have anything to do with the AC because I hear it even when I turn the AC off. I'm going to check for leaks. I opened the bonnet a few times before noticing this and saw some milky stain spots on the engine cover... could it be coolant?

When I saw it I thought it might be coolant, but the car didn't throw any codes, so I didn't think much of it

I am not a mechanic but I seem to remember that milky means oil and water mixing. I hope not! I would say take to dealer to check it out. I assume it's under warranty

Tskyline · 08-17-2020, 11:47 PM

Hi there is it smthg like this?

SemtexGT · 08-18-2020, 04:22 AM

Quote:

Originally Posted by Tskyline

Hi there is it smthg like this?

No, nothing like that. It sounded something like my ears were ringing, but very slight.

Hasn't happened since I posted this, so maybe I was just being hysterical.

SouthFLJoe · 04-16-2022, 08:33 PM

Quote:

Originally Posted by SemtexGT

Hello!

I have my M340i for about a month now and I've put about 3000 miles on it, runs like a dream, but I've noticed this 3 times already, after I drive it hard and the engine gets hot I hear in the cabin a wierd high pitched sound, like a kettle on the stove or something like that, which doesn't necesarilly seem to have any connection with the rpm I'm at.

Anyone have any ideas what it might be? Thanks for the help!

I have the same issue. Just brought it in to the dealer. Ever figure out what happened from this?

SouthFLJoe · 04-16-2022, 08:37 PM

Quote:

Originally Posted by SemtexGT

No, nothing like that. It sounded something like my ears were ringing, but very slight.

Hasn't happened since I posted this, so maybe I was just being hysterical.

https://youtube.com/shorts/i6BggquNz6M?feature=share

This is a decent video I took

jbarba · 04-17-2022, 08:25 AM

Quote:

Originally Posted by SouthFLJoe

Quote:

Originally Posted by SemtexGT

No, nothing like that. It sounded something like my ears were ringing, but very slight.

Hasn't happened since I posted this, so maybe I was just being hysterical.

https://youtube.com/shorts/i6BggquNz6M?feature=share

This is a decent video I took

try to replicate the sound with a completely emptied car: take all things out of the car (including the tow tools in the trunk).
Open the bonnet and check if engine protection is tight. Have you tried to reproduce it while stopped? I mean, if you get rpm hight enough while parked, the weird sound comes?

vicash · 06-20-2023, 05:21 AM

Haaving the same issue, did you find out what was the root cause?

PVDO · 06-26-2024, 04:24 PM

Quote:

Originally Posted by vicash

Haaving the same issue, did you find out what was the root cause?

Did you find out what caused it? Having the same problem. Thank you

nm2003 · 12-31-2024, 05:18 AM

Did anyone find out what was causing the ringing/chirping nose?

I have the following two videos with the noise.

Both videos have the same road but on different occassions.

https://1drv.ms/v/c/6047d9c344cd597d...QRVh4gTMvxTyWQ

https://1drv.ms/v/c/6047d9c344cd597d...9fE8rDTGKNMvnQ

08-13-2020, 11:31 PM	#1
SemtexGT Romanian Spy 70 Rep 146 Posts Drives: 2020 M340i xDrive Join Date: Jan 2018 Location: Cluj-Napoca iTrader: (0)	M340i high pitched sound after hard driving? Hello! I have my M340i for about a month now and I've put about 3000 miles on it, runs like a dream, but I've noticed this 3 times already, after I drive it hard and the engine gets hot I hear in the cabin a wierd high pitched sound, like a kettle on the stove or something like that, which doesn't necesarilly seem to have any connection with the rpm I'm at. Anyone have any ideas what it might be? Thanks for the help!
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08-14-2020, 07:10 AM	#2
themnmd Colonel 1716 Rep 2,692 Posts Drives: 23 X5MC Join Date: Sep 2018 Location: San Rafael CA iTrader: (0) Garage List 2020 BMW M340i X [0.00]	While still running or after turned off? Only thing I have heard is fan after turning off. Have you opened the hood to look for coolant leaks? I was thinking a steam leak from a hose or on coolant system? Also is AC on or off
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08-17-2020, 11:47 PM	#5
Tskyline New Member 11 Rep 19 Posts Drives: G20 Bmw 330i Join Date: Aug 2020 Location: Virginia/US iTrader: (0)	Hi there is it smthg like this? __________________ TK
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06-20-2023, 05:21 AM	#10
vicash Registered 0 Rep 2 Posts Drives: BMW 330D G20 Join Date: Jun 2023 Location: Amsterdam iTrader: (0)	Haaving the same issue, did you find out what was the root cause?
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12-31-2024, 05:18 AM	#12
nm2003 2023 M340i LCI xDrive (on order) 34 Rep 127 Posts Drives: 2023 M340i LCI Join Date: Nov 2022 Location: Melbourne, Australia iTrader: (0)	Did anyone find out what was causing the ringing/chirping nose? I have the following two videos with the noise. Both videos have the same road but on different occassions. https://1drv.ms/v/c/6047d9c344cd597d...QRVh4gTMvxTyWQ https://1drv.ms/v/c/6047d9c344cd597d...9fE8rDTGKNMvnQ __________________ 2023 (Australian Spec) G20 LCI M340 xDrive - Portimao Blue - Executive Pack, M Technology Pack, Carbon Fibre Trim
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