BMW 335i weird noises

FHE92 · 12-04-2015, 01:27 PM

Hi all,

I have a couple of weird noises that I am trying to diagnose but I am not sure what they can be. I would appreciate any help you can provide!

Noise 1 - the electrical whine!

I have put the video below, please have a good listen and let me know your thoughts. I think its either the LPFP or the drive shaft pinion bearing. Not sure but it is present on idle and whilst driving. I do give it some throttle in the video and you can hear the pitch change to a degree but ill let you be the judge!

Noise 2 - Drivers side (RHD) farting/humming noise but constantly audible. Have no idea what this is but it sounds like air pressure release of some kind.

Noise 3 - The hissing noise

This noise sounds like it is coming from the alternator area/ auxiliary belts. Could it be vacuum line leak or a crack in and around the throttle body (intake). Not sure

Really appreciate any insight!

FHE92 · 12-05-2015, 06:04 AM

Any ideas?

Sgop335 · 12-05-2015, 08:08 AM

Yea noise 2 could be boost solenoids.

FHE92 · 12-05-2015, 09:26 AM

Yea I though that too maybe thanks

FHE92 · 12-06-2015, 05:08 PM

Anyone have any ideas about noise 1?

Three_thirty_I · 12-06-2015, 05:52 PM

Stab at a guess, fuel pump? Not so familiar with the sounds up close of the N54/55. Could be the LPFP as you mentioned. Have never heard this on my 330i just for reference.

FHE92 · 12-09-2015, 01:52 AM

Quote:

Originally Posted by Three_thirty_I

Stab at a guess, fuel pump? Not so familiar with the sounds up close of the N54/55. Could be the LPFP as you mentioned. Have never heard this on my 330i just for reference.

Yea it could be but I'm not sure. I haven't yet had a very long crank situation or car not turning on situation either so I'm unsure.

FHE92 · 12-15-2015, 08:48 AM

Any other ideas? It has 50k miles on the clock.

FHE92 · 12-21-2015, 12:50 PM

Just an update:

Went to BMW and the following is being done:

New LPFP Sensor replacement
New Drive belt tensioner - noise 3 perhaps caused by this?
New Boost Solenoid as per noise 2

Noise 1 may go now due to new sensor possibly.

I guess I will wait and see.

But that load buzzing noise from the boost solenoid is not normal apparently so for those experiencing it as many are - get it changed.

This was covered by my BMW insured warranty! Wooo

matreyia · 10-24-2019, 09:17 AM

Did you get noise #1 fixed? It probably was a bad LPFP and not the sensor itself. If the sound is coming from the passenger rear seat, that is exactly where the LPFP is located. I have the same issue now and will do some tests this weekend to rule out LPFP or sensor. I have two LPFP units and one is on the way out or already gone...it makes the same noise and sometimes, it will go apeshit and sound like a tea kettle whistle.

12-04-2015, 01:27 PM	#1
FHE92 Private First Class 26 Rep 194 Posts Drives: Nothing interesting.... Join Date: Aug 2015 Location: London iTrader: (0)	BMW 335i weird noises - with videos Hi all, I have a couple of weird noises that I am trying to diagnose but I am not sure what they can be. I would appreciate any help you can provide! Noise 1 - the electrical whine! I have put the video below, please have a good listen and let me know your thoughts. I think its either the LPFP or the drive shaft pinion bearing. Not sure but it is present on idle and whilst driving. I do give it some throttle in the video and you can hear the pitch change to a degree but ill let you be the judge! Noise 2 - Drivers side (RHD) farting/humming noise but constantly audible. Have no idea what this is but it sounds like air pressure release of some kind. Noise 3 - The hissing noise This noise sounds like it is coming from the alternator area/ auxiliary belts. Could it be vacuum line leak or a crack in and around the throttle body (intake). Not sure Really appreciate any insight!
	Appreciate 0 Tweet Quote

12-05-2015, 06:04 AM	#2
FHE92 Private First Class 26 Rep 194 Posts Drives: Nothing interesting.... Join Date: Aug 2015 Location: London iTrader: (0)	Any ideas?
	Appreciate 0 Quote

12-05-2015, 08:08 AM	#3
Sgop335 Colonel 648 Rep 2,011 Posts Drives: 07 335i e92, 08 535i Join Date: Jun 2014 Location: MD iTrader: (1)	Yea noise 2 could be boost solenoids. __________________ 335i e92 TPC 19Ts
	Appreciate 0 Quote

12-05-2015, 09:26 AM	#4
FHE92 Private First Class 26 Rep 194 Posts Drives: Nothing interesting.... Join Date: Aug 2015 Location: London iTrader: (0)	Yea I though that too maybe thanks
	Appreciate 0 Quote

12-06-2015, 05:08 PM	#5
FHE92 Private First Class 26 Rep 194 Posts Drives: Nothing interesting.... Join Date: Aug 2015 Location: London iTrader: (0)	Anyone have any ideas about noise 1?
	Appreciate 0 Quote

12-06-2015, 05:52 PM	#6
Three_thirty_I Lieutenant Colonel 200 Rep 1,834 Posts Drives: '05 E90 330i Manual Join Date: Aug 2010 Location: Cape Town, South Africa iTrader: (0) Garage List 2005 BMW E90 330i [0.00]	Stab at a guess, fuel pump? Not so familiar with the sounds up close of the N54/55. Could be the LPFP as you mentioned. Have never heard this on my 330i just for reference. __________________ BMW E90 330i (M) '05 (His) \| (Hers) BMW E46 320i f/l (M) '03
	Appreciate 0 Quote

12-15-2015, 08:48 AM	#8
FHE92 Private First Class 26 Rep 194 Posts Drives: Nothing interesting.... Join Date: Aug 2015 Location: London iTrader: (0)	Any other ideas? It has 50k miles on the clock.
	Appreciate 0 Quote

12-21-2015, 12:50 PM	#9
FHE92 Private First Class 26 Rep 194 Posts Drives: Nothing interesting.... Join Date: Aug 2015 Location: London iTrader: (0)	Just an update: Went to BMW and the following is being done: New LPFP Sensor replacement New Drive belt tensioner - noise 3 perhaps caused by this? New Boost Solenoid as per noise 2 Noise 1 may go now due to new sensor possibly. I guess I will wait and see. But that load buzzing noise from the boost solenoid is not normal apparently so for those experiencing it as many are - get it changed. This was covered by my BMW insured warranty! Wooo
	Appreciate 0 Quote

10-24-2019, 09:17 AM	#10
matreyia Private First Class 36 Rep 137 Posts Drives: 335i Convertible Montego Blue Join Date: Jun 2013 Location: Austin iTrader: (0)	Did you get noise #1 fixed? It probably was a bad LPFP and not the sensor itself. If the sound is coming from the passenger rear seat, that is exactly where the LPFP is located. I have the same issue now and will do some tests this weekend to rule out LPFP or sensor. I have two LPFP units and one is on the way out or already gone...it makes the same noise and sometimes, it will go apeshit and sound like a tea kettle whistle.
	Appreciate 0 Quote