Moaning Noise coming from N54 Engine (On and off...) What could it be??

import36 · 09-14-2012, 11:14 AM

i get this sound as well.....had it with both Cobb and Procede so it's not tune specific. and as folks say.....it's intermittent....but pretty annoying to be honest.

914kid · 07-11-2013, 09:50 PM

Hey I have this noise as well WTF is this. Drove me NUTS I heard it for the first time when installing my HID fogs. Starting the car it doesn't come until you rev it and after that its so annoying.

scott135i · 07-14-2013, 09:37 PM

Quote:

Originally Posted by 914kid

Hey I have this noise as well WTF is this. Drove me NUTS I heard it for the first time when installing my HID fogs. Starting the car it doesn't come until you rev it and after that its so annoying.

Never could identify the source... but it never caused a problem (that I know of)

chmerlinn · 10-05-2015, 05:56 PM

Sorry to bump this old thread, but I am looking at buying a used 335xi - n54 engine, and it's producing the same noise. Anyone ever confirm what this was, or have better insight now? Thanks!

scott135i · 10-09-2015, 01:35 AM

Quote:

Originally Posted by chmiel21

Sorry to bump this old thread, but I am looking at buying a used 335xi - n54 engine, and it's producing the same noise. Anyone ever confirm what this was, or have better insight now? Thanks!

Some vacuum valve but can't remember the details. Sorry!

whosdady · 10-09-2015, 08:15 AM

The noise is coming from the boost solenoids. I would replace both. They aren't too expensive and are easy to do.

zachclemente · 01-30-2020, 03:26 PM

Mine cycles on and off. 4 seconds on 4-5 seconds off. I also get a tik tik tik that started around the same time. I wonder if they're correlated? Please, if anyone has found a fix, let me know! thanks!

chmerlinn · 01-30-2020, 03:36 PM

Quote:

Originally Posted by zachclemente

Mine cycles on and off. 4 seconds on 4-5 seconds off. I also get a tik tik tik that started around the same time. I wonder if they're correlated? Please, if anyone has found a fix, let me know! thanks!

I replaced my vacuum lines and boost solenoid (only one was bad). Solved my problem for under $100.

Cabdriver · 02-05-2020, 11:47 PM

Quote:

Originally Posted by whosdady

The noise is coming from the boost solenoids. I would replace both. They aren't too expensive and are easy to do.

I second that, boost solenoids.

09-14-2012, 11:14 AM	#23
import36 Burrito bowl connoisseur 133 Rep 3,501 Posts Drives: 2015 Nissan GTR Black Edition Join Date: Feb 2008 Location: Seven Cities iTrader: (1)	i get this sound as well.....had it with both Cobb and Procede so it's not tune specific. and as folks say.....it's intermittent....but pretty annoying to be honest.
	Appreciate 0 Quote

07-11-2013, 09:50 PM	#24
914kid Banned 28 Rep 363 Posts Drives: E90 335xi Join Date: Jun 2013 Location: Pelham, NY iTrader: (1)	Hey I have this noise as well WTF is this. Drove me NUTS I heard it for the first time when installing my HID fogs. Starting the car it doesn't come until you rev it and after that its so annoying.
	Appreciate 0 Quote

10-05-2015, 05:56 PM	#26
chmerlinn Private 7 Rep 56 Posts Drives: 2010 335 Join Date: Jun 2012 Location: Ottawa, ON, Canada iTrader: (1)	Sorry to bump this old thread, but I am looking at buying a used 335xi - n54 engine, and it's producing the same noise. Anyone ever confirm what this was, or have better insight now? Thanks!
	Appreciate 0 Quote

10-09-2015, 08:15 AM	#28
whosdady Major 136 Rep 1,075 Posts Drives: 335i Coupe Join Date: Aug 2012 Location: STL iTrader: (10)	The noise is coming from the boost solenoids. I would replace both. They aren't too expensive and are easy to do.
	Appreciate 0 Quote

01-30-2020, 03:26 PM	#29
zachclemente Registered 0 Rep 1 Posts Drives: BMW 335i Join Date: Jan 2020 Location: Virginia Beach iTrader: (0)	Same issue Mine cycles on and off. 4 seconds on 4-5 seconds off. I also get a tik tik tik that started around the same time. I wonder if they're correlated? Please, if anyone has found a fix, let me know! thanks!
	Appreciate 0 Quote