B48 Funny Noise

GGGGOAT · 05-03-2019, 07:20 AM

Just purchased a 2019 430i M Edition. Wife noticed a funny noise on cold start up. It almost sounds like a helicopter noise coming from under the car. Dealership said it was normal, something about the cats going through a warm up process or something?

rjd_F30 · 05-03-2019, 07:36 AM

Video?

GGGGOAT · 05-03-2019, 07:39 AM

Yep, it's the deep noise. Almost sounds like a helicopter. Will come and go as the car is idling when cold.

rjd_F30 · 05-03-2019, 12:48 PM

Quote:

Originally Posted by GGGGOAT

Yep, it's the deep noise. Almost sounds like a helicopter. Will come and go as the car is idling when cold.

Does sound like a helicopter...

It sounds like something is banging or rattling up against something that it shouldn't be. If it happens more on cold starts when the engine shakes the most, I'd guess some exhaust hanger or bolt is loose. That's the first thing I'd check.

Sweeney921 · 05-03-2019, 06:07 PM

How much fuel is in your tank? To me it sounds similar to the (normal) LPFP clatter, which is only noticeable below 1/4 tank.

CHANTARS · 05-06-2019, 05:32 PM

Quote:

Originally Posted by Sweeney921

How much fuel is in your tank? To me it sounds similar to the (normal) LPFP clatter, which is only noticeable below 1/4 tank.

This^^^

Raphy · 06-20-2019, 08:11 AM

I had the exact same noise on my B48 330i when fuel was about 40 km left... once I filled up the tank the noise was instantly gone.

Figus · 03-28-2022, 04:02 AM

Hi
Did you solve the problem with the noise?
I’ve got the same problem but cannot find the solution
Thank you in advance

Laurentfy · 03-30-2022, 03:04 AM

Have a look: https://www.tsbsearch.com/BMW/SI-B16-03-19

SIB 16 03 19
NOISES FROM THE FUEL TANK AT IDLE
2020-07-06
This Service Information Bulletin (Revision 1) replaces SI B16 03 19 dated April 2019

SITUATION
All vehicles except the F48 (X1):
While driving slowly with low RPM or while idling a faint knocking or fluttering noise can be heard from inside the fuel tank with a low fuel level approximately less than 2 gallons). The customer may describe this noise as a “helicopter noise” from the rear of the vehicle.

CAUSE:Pressure fluctuations from the tank ventilation valve will cause the fuel tank filler pipe non-return valve to vibrate. In some cases, the vibration can be heard inside the vehicle.

05-03-2019, 07:20 AM	#1
GGGGOAT New Member 7 Rep 17 Posts Drives: 2019 BMW 430i M Sport Join Date: May 2019 Location: Severn, MD iTrader: (0)	B48 Funny Noise Just purchased a 2019 430i M Edition. Wife noticed a funny noise on cold start up. It almost sounds like a helicopter noise coming from under the car. Dealership said it was normal, something about the cats going through a warm up process or something?
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05-03-2019, 07:36 AM	#2
rjd_F30 Brigadier General 2000 Rep 3,679 Posts Drives: 2013 335i 6MT Join Date: Jun 2017 Location: New Jersey iTrader: (0)	Video? __________________ Instagram: rjd_f30 \| Current: EBII 2013 335i 6MT RWD & Sprint Blue 2008 Audi RS4 \| Retired: 2013 328i, 2000 XTerra, 2022 Civic Si \|
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05-03-2019, 07:39 AM	#3
GGGGOAT New Member 7 Rep 17 Posts Drives: 2019 BMW 430i M Sport Join Date: May 2019 Location: Severn, MD iTrader: (0)	Yep, it's the deep noise. Almost sounds like a helicopter. Will come and go as the car is idling when cold.
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05-03-2019, 06:07 PM	#5
Sweeney921 Second Lieutenant 98 Rep 227 Posts Drives: 2000 BMW E39 M5 Join Date: Dec 2016 Location: USA iTrader: (0) Garage List 2017 BMW 330i Touring [0.00]	How much fuel is in your tank? To me it sounds similar to the (normal) LPFP clatter, which is only noticeable below 1/4 tank. __________________ 2017 BMW 330i Sport Wagon - M-sport, EBII, THP, DHP Supersprint cat-back exhaust (resonated, dual outlet) - H&R rear sway bar - ER charge pipe Waiting for: Bootmod3 - xHP Flashtool - xDelete
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06-20-2019, 08:11 AM	#7
Raphy Enlisted Member 5 Rep 32 Posts Drives: 2018 BMW F30 B46 Join Date: Jun 2019 Location: Toronto iTrader: (0)	I had the exact same noise on my B48 330i when fuel was about 40 km left... once I filled up the tank the noise was instantly gone.
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03-28-2022, 04:02 AM	#8
Figus Registered 0 Rep 2 Posts Drives: BMW f30 330i Join Date: Mar 2022 Location: Australia iTrader: (0)	Hi Did you solve the problem with the noise? I’ve got the same problem but cannot find the solution Thank you in advance
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03-30-2022, 03:04 AM	#9
Laurentfy New Member 2 Rep 6 Posts Drives: 420i Join Date: May 2021 Location: France iTrader: (0)	Have a look: https://www.tsbsearch.com/BMW/SI-B16-03-19 SIB 16 03 19 NOISES FROM THE FUEL TANK AT IDLE 2020-07-06 This Service Information Bulletin (Revision 1) replaces SI B16 03 19 dated April 2019 SITUATION All vehicles except the F48 (X1): While driving slowly with low RPM or while idling a faint knocking or fluttering noise can be heard from inside the fuel tank with a low fuel level approximately less than 2 gallons). The customer may describe this noise as a “helicopter noise” from the rear of the vehicle. CAUSE:Pressure fluctuations from the tank ventilation valve will cause the fuel tank filler pipe non-return valve to vibrate. In some cases, the vibration can be heard inside the vehicle. Last edited by Laurentfy; 03-30-2022 at 03:07 AM.. Reason: add a link
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