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      12-04-2015, 01:27 PM   #1
FHE92
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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!
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      12-05-2015, 06:04 AM   #2
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Any ideas?
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      12-05-2015, 08:08 AM   #3
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Yea noise 2 could be boost solenoids.
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      12-05-2015, 09:26 AM   #4
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Yea I though that too maybe thanks
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      12-06-2015, 05:08 PM   #5
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Anyone have any ideas about noise 1?
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      12-06-2015, 05:52 PM   #6
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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.
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      12-09-2015, 01:52 AM   #7
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Quote:
Originally Posted by Three_thirty_I View Post
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.
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      12-15-2015, 08:48 AM   #8
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Any other ideas? It has 50k miles on the clock.
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      12-21-2015, 12:50 PM   #9
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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
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      10-24-2019, 09:17 AM   #10
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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.
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