Slight Engine shudder on turn-off ???

tominizer · 06-23-2016, 10:41 AM

........noticed on my (new to me) Z4M roadster a slight engine shudder when I shut her off. Is that normal ?

StickMon · 06-23-2016, 11:03 AM

Yep, normal.
I always thought it was the Vanos using the pressure stored in the accumulator to hammer the exhaust camshaft to the "start position", but I was wrong.
SaltyNC mentioned in another thread that it doesn't do that if you hold the clutch in when you shut it off.
Sure enough!
So it must be the dual-mass flywheel.

Finnegan · 06-23-2016, 03:25 PM

Quote:

Originally Posted by StickMon

Yep, normal.
I always thought it was the Vanos using the pressure stored in the accumulator to hammer the exhaust camshaft to the "start position", but I was wrong.
SaltyNC mentioned in another thread that it doesn't do that if you hold the clutch in when you shut it off.
Sure enough!
So it must be the dual-mass flywheel.

^WHS

N55_Mike · 07-04-2016, 10:47 PM

Throw out bearing is gone, Same issue with my Z.

tecnicaeleven · 07-08-2016, 08:02 AM

So we all agree its the flywheel/clutch.

Now... is it normal? Or is there a problem like what was posted above?

tominizer · 07-08-2016, 08:49 AM

My mechanic doesn't seem to think it's the throw out bearing at all. Can you confirm that after repairing the TOB, this shuddering stops when you shut off the car?

BTW, there's a ton of posts relating to the S54 motor that this shuddering is normal. Personally, I find that hard to believe. I've driven other S54 cars and this was not occurring.

N55_Mike · 07-08-2016, 08:12 PM

I had a master transmission builder diagnosis the sound, before I assumed anything. He told me it's the throw out bearing, and said might as well do a clutch/flywheel job at the same time, and rear main seal. All the noise disappeared once I completed the job replacing all mentioned parts..

Quote:

Originally Posted by tominizer

My mechanic doesn't seem to think it's the throw out bearing at all. Can you confirm that after repairing the TOB, this shuddering stops when you shut off the car?

BTW, there's a ton of posts relating to the S54 motor that this shuddering is normal. Personally, I find that hard to believe. I've driven other S54 cars and this was not occurring.

N55_Mike · 07-08-2016, 08:15 PM

I put 35k miles on my car with the shutteringuys, which includes a lot of stopped traffic/tracking/drag strip and not a single thing happened.

Quote:

Originally Posted by tecnicaeleven

So we all agree its the flywheel/clutch.

Now... is it normal? Or is there a problem like what was posted above?

tominizer · 07-11-2016, 06:45 PM

thanks

StickMon · 07-12-2016, 07:33 PM

I put 100,000 miles on mine with the shudder at turn off.
No noise at all idling with foot off the clutch that would indicate TOB trouble.

inTgr8r · 07-12-2016, 09:19 PM

^this.
Usually TOB problem is noticeable idling in neutral with clutch out

tominizer · 07-13-2016, 10:38 AM

nope. I don't have that issue.

06-23-2016, 10:41 AM	#1
tominizer Lieutenant 98 Rep 500 Posts Drives: 2007 Z4M Roadster Join Date: May 2016 Location: Toronto iTrader: (1)	Slight Engine shudder on turn-off ??? ........noticed on my (new to me) Z4M roadster a slight engine shudder when I shut her off. Is that normal ?
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06-23-2016, 11:03 AM	#2
StickMon My other car is on Mars 636 Rep 3,124 Posts Drives: 2006 MR Join Date: Feb 2011 Location: Lo-Cal iTrader: (1)	Yep, normal. I always thought it was the Vanos using the pressure stored in the accumulator to hammer the exhaust camshaft to the "start position", but I was wrong. SaltyNC mentioned in another thread that it doesn't do that if you hold the clutch in when you shut it off. Sure enough! So it must be the dual-mass flywheel. __________________ Warning: May contain traces of nuts.
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07-04-2016, 10:47 PM	#4
N55_Mike Banned 11 Rep 115 Posts Drives: 135i, Z4MC, MK7 GTI Join Date: Nov 2015 Location: California iTrader: (1)	Throw out bearing is gone, Same issue with my Z.
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07-08-2016, 08:02 AM	#5
tecnicaeleven Private 38 Rep 69 Posts Drives: 07 Cooper S / 07 M Roadster Join Date: Dec 2014 Location: Nashville TN iTrader: (0)	So we all agree its the flywheel/clutch. Now... is it normal? Or is there a problem like what was posted above?
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07-08-2016, 08:49 AM	#6
tominizer Lieutenant 98 Rep 500 Posts Drives: 2007 Z4M Roadster Join Date: May 2016 Location: Toronto iTrader: (1)	My mechanic doesn't seem to think it's the throw out bearing at all. Can you confirm that after repairing the TOB, this shuddering stops when you shut off the car? BTW, there's a ton of posts relating to the S54 motor that this shuddering is normal. Personally, I find that hard to believe. I've driven other S54 cars and this was not occurring.
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07-11-2016, 06:45 PM	#9
tominizer Lieutenant 98 Rep 500 Posts Drives: 2007 Z4M Roadster Join Date: May 2016 Location: Toronto iTrader: (1)	thanks
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07-12-2016, 07:33 PM	#10
StickMon My other car is on Mars 636 Rep 3,124 Posts Drives: 2006 MR Join Date: Feb 2011 Location: Lo-Cal iTrader: (1)	I put 100,000 miles on mine with the shudder at turn off. No noise at all idling with foot off the clutch that would indicate TOB trouble. __________________ Warning: May contain traces of nuts.
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07-12-2016, 09:19 PM	#11
inTgr8r Lieutenant General 2426 Rep 11,667 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	^this. Usually TOB problem is noticeable idling in neutral with clutch out __________________ '21 M2C Hockenheim Silver '18 718 Cayman S Lava Orange (sold) '13 E92 M3 Santorini Blue (sold) '07 Z4 M Coupe Alpine White (sold)
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07-13-2016, 10:38 AM	#12
tominizer Lieutenant 98 Rep 500 Posts Drives: 2007 Z4M Roadster Join Date: May 2016 Location: Toronto iTrader: (1)	nope. I don't have that issue.
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