Weird sound on engine shutdown?

Tommeh · 03-01-2012, 07:48 AM

Anyone else have this really weird sound when then turn there n54 off? I have no idea what it is... But BWM gave me the OKAY for my inspection T_T

EFI Logics · 03-01-2012, 08:20 AM

That's just chatter from the flywheel. Nothing to worry about there...

-Josh

Spitfire007 · 03-01-2012, 03:09 PM

I have the same chatter. Dealer said it was normal.

ErvGotti · 03-01-2012, 03:41 PM

As stated above it's flywheel chatter and it's normal, just press in the clutch pedal when you shut it off and it will not chatter.

BFD99 · 03-01-2012, 04:23 PM

The chatter or the sound that, that sounds like chewbacca? LOL

DriveHard · 03-01-2012, 04:28 PM

Flywheel ??? what rattles in a flywheel..... its not like he had the clutch depressed or anything????

If anything i would say its the wastegates..

Tommeh · 03-01-2012, 05:59 PM

Okay to clarify im talking about the cat moan at 16 seconds. The noise before it is not "Normal" that is waste gate actuator arm and it piss's me off, but hasn't completely broken my turbos yet lol....

DriveHard · 03-02-2012, 11:04 AM

OK.. I thought we were talking about the wastegates.. so we are clear, the first noise is waste gates and the second noise is the unknown. ( the sharp farting noise)

It sounds to me as though that is resonance thru one of the charge pipes when the engine / wastegates close open / rattle upon engine off..

I bet if you are under the hood while someon else turns the car off, and you feel around, you will find the suspect pipe with the resonance in it.

thats my guess.

and for what it is worth, it is not the flywheel... it stopped spinning already prior to the engine noise that we are talking about.

Dackelone · 03-02-2012, 11:20 AM

Why not press the clutch in (to the floor) and turn off the engine. Then you will know IF that noise is from the flywheel or from the engine area. Its reall hard to tell with your video and mic noise. I would suggest making a few starts and stops with the engine in one video. But even then its hard to diagnose a car via the internet.

DriveHard · 03-02-2012, 11:33 AM

Quote:

Originally Posted by Dackelone

But even then its hard to diagnose a car via the internet.

whadda you mean.. if the answer is on the internet.... well it must be right !!!

03-01-2012, 07:48 AM	#1
Tommeh Lieutenant 56 Rep 481 Posts Drives: 96 BMW M3 & 16 GMC Canyon Join Date: Mar 2011 Location: Washington iTrader: (0)	Weird sound on engine shutdown? Anyone else have this really weird sound when then turn there n54 off? I have no idea what it is... But BWM gave me the OKAY for my inspection T_T
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03-01-2012, 08:20 AM	#2
EFI Logics 52 Rep 306 Posts Drives: '08 BMW 135i, 08 535Xi Join Date: Feb 2012 Location: Bethel, CT iTrader: (0)	That's just chatter from the flywheel. Nothing to worry about there... -Josh
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03-01-2012, 03:09 PM	#3
Spitfire007 Captain 189 Rep 682 Posts Drives: 09 328i Sport 6MT Join Date: Dec 2011 Location: Baltimore, MD iTrader: (0) Garage List 2009 BMW 328i [0.00]	I have the same chatter. Dealer said it was normal.
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03-01-2012, 03:41 PM	#4
ErvGotti Major 124 Rep 1,362 Posts Drives: 2008 135i 6MT Join Date: Jul 2010 Location: Aviano iTrader: (5) Garage List 2008 135i [6.00]	As stated above it's flywheel chatter and it's normal, just press in the clutch pedal when you shut it off and it will not chatter.
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03-01-2012, 04:23 PM	#5
BFD99 The Stig! 54 Rep 889 Posts Drives: 2008 135i 6MT Join Date: Sep 2011 Location: Tulsa, Ok iTrader: (1) Garage List 2008 BMW 135i [10.00]	The chatter or the sound that, that sounds like chewbacca? LOL __________________ 2008 135i - FBO + JB4 15ohm + Water Meth
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03-01-2012, 04:28 PM	#6
DriveHard Colonel 117 Rep 1,998 Posts Drives: X1 and R58 JCW Join Date: Aug 2010 Location: Long Island iTrader: (0)	Flywheel ??? what rattles in a flywheel..... its not like he had the clutch depressed or anything???? If anything i would say its the wastegates.. __________________ X1, R58 JCW, M2 in my future if planets align
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03-01-2012, 05:59 PM	#7
Tommeh Lieutenant 56 Rep 481 Posts Drives: 96 BMW M3 & 16 GMC Canyon Join Date: Mar 2011 Location: Washington iTrader: (0)	Okay to clarify im talking about the cat moan at 16 seconds. The noise before it is not "Normal" that is waste gate actuator arm and it piss's me off, but hasn't completely broken my turbos yet lol....
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03-02-2012, 11:04 AM	#8
DriveHard Colonel 117 Rep 1,998 Posts Drives: X1 and R58 JCW Join Date: Aug 2010 Location: Long Island iTrader: (0)	OK.. I thought we were talking about the wastegates.. so we are clear, the first noise is waste gates and the second noise is the unknown. ( the sharp farting noise) It sounds to me as though that is resonance thru one of the charge pipes when the engine / wastegates close open / rattle upon engine off.. I bet if you are under the hood while someon else turns the car off, and you feel around, you will find the suspect pipe with the resonance in it. thats my guess. and for what it is worth, it is not the flywheel... it stopped spinning already prior to the engine noise that we are talking about. __________________ X1, R58 JCW, M2 in my future if planets align
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03-02-2012, 11:20 AM	#9
Dackelone European Editor 10589 Rep 22,992 Posts Drives: N54 e82 Join Date: Feb 2010 Location: Bayern, Germany iTrader: (1)	Why not press the clutch in (to the floor) and turn off the engine. Then you will know IF that noise is from the flywheel or from the engine area. Its reall hard to tell with your video and mic noise. I would suggest making a few starts and stops with the engine in one video. But even then its hard to diagnose a car via the internet.
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