Strange low pitch horn/farting sound coming from the motor??

shifterboy45 · 02-15-2011, 08:23 PM

with the variance in vacuum on a f/i engine, you can see the swirl pattern generated to seperate the oil and combustion chamber gases can rise and fall quickly -- giving you that fog horn type noise. plus the conventional system had to be modified to deal with "on-boost" pressure regulation too.

the job on an E46 is usually about 500 bucks and its doable, but in no way easy on the E9x.. if its not too loud or affecting the idle quality of the car, its best to leave it alone..

itsbrokeagain · 02-15-2011, 08:34 PM

I have a customer who's car does the same thing. Nothing abnormal.

Alan l. · 02-15-2011, 08:45 PM

Thanks for the help everyone. At first I thought I over filled my oil which caused the noise which got me worried. (hate not having a oil dip stick!)

Alan

stickz23 · 09-12-2012, 01:47 AM

My car is making the same noise. I researched the sounds and found this thread.
Anyone actually fix the sound?

Evil///M · 09-12-2012, 10:59 AM

Hahahaha I just laughed when I read "farting sound coming from motor"

Alan l. · 09-12-2012, 11:20 AM

This was a Procede only noise. When i first had my JB3 i never had this noise and after i switched out the procede for the Cobb the noise went away completely.

There was some firmware revision that caused this noise to appear on procede cars during idling.

Alan

stickz23 · 09-14-2012, 01:42 AM

I purchased my car in March of this year and never had the noise. I first noticed the noise after installing the BMS DCI two weeks ago. I never had my car tuned prior to the noise.

I wonder if adding a oil separator or oil catch can will aid any of the sound?

Jay.n54.23 · 10-24-2019, 08:14 PM

It might be your boost solenoids.

AngelFarelli · 01-30-2020, 02:44 AM

I got a sound similar to this and it changes with variations in speed but it this is it at its worse when I was driving slow

I eventually put the camera out the window to capture the sound better.

jwramr · 02-17-2020, 07:54 PM

Those video links are broken... Mine, 500 miles on a new engine... Is making this sound

https://photos.app.goo.gl/cf5cPvc63PVRFFfb9

https://photos.app.goo.gl/cf5cPvc63PVRFFfb9

Assuming that link works... Anyone know what that noise is?

02-15-2011, 08:23 PM	#23
shifterboy45 Major 23 Rep 1,179 Posts Drives: 2009 335i Coupe Join Date: Feb 2009 Location: North by Northwest iTrader: (0)	with the variance in vacuum on a f/i engine, you can see the swirl pattern generated to seperate the oil and combustion chamber gases can rise and fall quickly -- giving you that fog horn type noise. plus the conventional system had to be modified to deal with "on-boost" pressure regulation too. the job on an E46 is usually about 500 bucks and its doable, but in no way easy on the E9x.. if its not too loud or affecting the idle quality of the car, its best to leave it alone..
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02-15-2011, 08:34 PM	#24
itsbrokeagain 311 Rep 15,745 Posts Drives: 1999 528iT, E53 X5, E46 325xi Join Date: Mar 2007 Location: Strong Island iTrader: (7)	I have a customer who's car does the same thing. Nothing abnormal.
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02-15-2011, 08:45 PM	#25
Alan l. Major General 5826 Rep 9,056 Posts Drives: 2020 F95 X5M Competition Join Date: Jun 2009 Location: United States iTrader: (9)	Thanks for the help everyone. At first I thought I over filled my oil which caused the noise which got me worried. (hate not having a oil dip stick!) Alan __________________
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09-12-2012, 01:47 AM	#26
stickz23 Modify the N54 17 Rep 365 Posts Drives: 335i Join Date: Jun 2011 Location: Downey, California iTrader: (15)	My car is making the same noise. I researched the sounds and found this thread. Anyone actually fix the sound?
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09-12-2012, 10:59 AM	#27
Evil///M Professional Hitman 181 Rep 1,002 Posts Drives: Built 335is \| Ranger Tremor Join Date: Feb 2011 Location: 602 iTrader: (12) Garage List 2011 335is [9.17] 2021 Ford Ranger Tr ... [10.00] 2014 Audi R8 v10+ [10.00] 2019 BMW M2 Competi ... [9.75]	Hahahaha I just laughed when I read "farting sound coming from motor" __________________
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09-12-2012, 11:20 AM	#28
Alan l. Major General 5826 Rep 9,056 Posts Drives: 2020 F95 X5M Competition Join Date: Jun 2009 Location: United States iTrader: (9)	This was a Procede only noise. When i first had my JB3 i never had this noise and after i switched out the procede for the Cobb the noise went away completely. There was some firmware revision that caused this noise to appear on procede cars during idling. Alan __________________
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09-14-2012, 01:42 AM	#29
stickz23 Modify the N54 17 Rep 365 Posts Drives: 335i Join Date: Jun 2011 Location: Downey, California iTrader: (15)	I purchased my car in March of this year and never had the noise. I first noticed the noise after installing the BMS DCI two weeks ago. I never had my car tuned prior to the noise. I wonder if adding a oil separator or oil catch can will aid any of the sound?
	Appreciate 0 Quote

10-24-2019, 08:14 PM	#30
Jay.n54.23 Registered 0 Rep 3 Posts Drives: Bmw e92 335i n54 Join Date: Jun 2019 Location: Bay Area iTrader: (0)	It might be your boost solenoids.
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01-30-2020, 02:44 AM	#31
AngelFarelli Second Lieutenant 59 Rep 276 Posts Drives: BMW n52 e90 Join Date: Nov 2019 Location: California iTrader: (0)	I got a sound similar to this and it changes with variations in speed but it this is it at its worse when I was driving slow I eventually put the camera out the window to capture the sound better.
	Appreciate 0 Quote

02-17-2020, 07:54 PM	#32
jwramr New Member 4 Rep 18 Posts Drives: 2012 BMW 335is Convertible Join Date: Sep 2019 Location: Raleigh iTrader: (0)	Those video links are broken... Mine, 500 miles on a new engine... Is making this sound https://photos.app.goo.gl/cf5cPvc63PVRFFfb9 https://photos.app.goo.gl/cf5cPvc63PVRFFfb9 Assuming that link works... Anyone know what that noise is?
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