[W126 Coupe] RE Rolling Vibration on 1985 500 SEC

[Larry Martin]

Can't speak clearly to "rolling vibration" but the miss at idle can be
from any one of several causes:
	1) Bad ignition wire to plug (check each plug for color...the
dark one is the one missing)
		a) Can be bad plug, bad wire, or bad distributor (A
spark analyzer can find this easily) 
	2) Fuel distribution problem:
		a) (stuck open or closed) fuel injector (at the engine).
If this is the case...a forced cleaning
               can be done...but before you do that (or replace the
injectors)...
		b) Can also be bad fuel distributor. When running at
idle...slightly loosed each line from the
               fuel distributor...fuel should be easily seen when the
nut is turned (loose) just a turn or two.
A 'quick fix' can be done in many cases by putting a high quality fuel
injector cleaner into the gas tank...maybe 2 or 3 times the recommended
amount. Drive the car a day or two....If this 'fixes it'...it is likely
a fuel contamination issue in one form or another. I have found that
SHELL gasoline (with the Nitrogen cleaners they use) keep my '84 500SEC
clean and running smooth without any extra cleanings or help of any kind
to run 'really smooth' at all times.
	3) Vacuum Line connection on passenger side of Air Horn...mid
engine. 
This vacuum line connection is via rubber hose and it wears out and has
a tendency to be 'loose' at times. This causes an irregular miss at
times. Best fix is to use a small clamp on the rubber line (right at the
intake area) to keep this vacuum line tight at all times. This is a
sneaky one.

P.S. Oh yes...the rolling vibration can be (among other things), bad
motor mounts allowing the engine to "move around", or the heat riser
(which is more of a 'rattle' than a vibration), but goes away when the
engine has warmed up.

Regards,
L. Martin
1985 500SEC (Euro)

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Today's Topics:

   1. Re: rolling vibration at idle on 1985 500 (btb management)
   2. Re: rolling vibration at idle on 1985 500 (shinzbox at aol.com)
   3. Re: rolling vibration at idle on 1985 500 (Jonathan Hodgman)
   4. ingnition problem (Arien Hackett)
   5. Re: ingnition problem (Dan Landiss)
   6. Re: ingnition problem (wjs)
   7. Re: ingnition problem (Axel Wulff)
   8. Re: ingnition problem (Dick Spellman)


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Message: 1
Date: Fri, 9 Oct 2009 19:21:23 +0000
From: btb management <btbmanagement at hotmail.com>
Subject: Re: [W126 Coupe] rolling vibration at idle on 1985 500
To: <mbcoupes at mbcoupes.com>
Message-ID: <SNT110-W551EE211AE02E9A7FD7DA2A8CB0 at phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"



My 1985 500 SEC had a slight shake like it was missing at
idle....thought it was a spark plug but they checked out ok.  My
mechanic looked at it (he claims for 8 hours) and replaced the ignition
distributor cap but that didn't solve the problem.  Drove the car and
the initial shake is gone but now there is a rolling vibration when the
car is standing still. Any thoughts?

Thanks,
Bob
 		 	   		  
_________________________________________________________________
Hotmail: Trusted email with powerful SPAM protection.
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Message: 2
Date: Fri, 09 Oct 2009 15:52:53 -0400
From: shinzbox at aol.com
Subject: Re: [W126 Coupe] rolling vibration at idle on 1985 500
To: mbcoupes at mbcoupes.com
Message-ID: <8CC173139355E3F-76FC-D3E4 at webmail-d050.sysops.aol.com>
Content-Type: text/plain; charset="us-ascii"


 Could be motor mounts?


 


Shin Takei

 

-----Original Message-----
From: btb management <btbmanagement at hotmail.com>
To: mbcoupes at mbcoupes.com
Sent: Fri, Oct 9, 2009 12:21 pm
Subject: Re: [W126 Coupe] rolling vibration at idle on 1985 500














My 1985 500 SEC had a slight shake like it was missing at
idle....thought it was a spark plug but they checked out ok.? My
mechanic looked at it (he claims for 8 hours) and replaced the ignition
distributor cap but that didn't solve the problem.? Drove the car and
the initial shake is gone but now there is a rolling vibration when the
car is standing still. Any thoughts?

Thanks,
Bob
                       


Hotmail: Trusted email with powerful SPAM protection. Sign up now.=


 





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Postings remain property of MB Coupes, L.L.C.



 

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Message: 3
Date: Fri, 09 Oct 2009 15:37:25 -0400
From: Jonathan Hodgman <blueridgemb at gmail.com>
Subject: Re: [W126 Coupe] rolling vibration at idle on 1985 500
To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
Message-ID: <4ACF90F5.9000601 at gmail.com>
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Message: 4
Date: Fri, 9 Oct 2009 22:19:29 -0700 (PDT)
From: Arien Hackett <arienhackett at ymail.com>
Subject: [W126 Coupe] ingnition problem
To: mbcoupes at mbcoupes.com
Message-ID: <547617.30463.qm at web65305.mail.ac2.yahoo.com>
Content-Type: text/plain; charset="us-ascii"

cant unlock stearing nor start car


      
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Message: 5
Date: Sat, 10 Oct 2009 09:41:27 -0500
From: Dan Landiss <dan at landiss.com>
Subject: Re: [W126 Coupe] ingnition problem
To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
Message-ID: <4AD09D17.6070302 at landiss.com>
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Message: 6
Date: Sat, 10 Oct 2009 10:48:26 -0400
From: wjs <wjs201 at optonline.net>
Subject: Re: [W126 Coupe] ingnition problem
To: dan at landiss.com, Mercedes Coupes Mailing Lists
	<mbcoupes at mbcoupes.com>
Message-ID: <881F9B6A-4E0E-46E3-BA34-F5E6933BF095 at optonline.net>
Content-Type: text/plain; charset="us-ascii"; Format="flowed";
	DelSp="yes"

Best to just pay for a new lock cylinder. $60. The car's old and they  
wear out.


On Oct 10, 2009, at 10:41 AM, Dan Landiss wrote:


> That is a lock cylinder problem, not an ignition problem. You will

> have to find the instructions for removing the cylinder and hope  

> that if you jiggle it enough

> it will finally turn. If it never will, prepare for a tedious  

> drilling job.

>

> But if it ever does, DON'T TURN IT BACK.

>

>

> on 10/10/2009 12:19 AM Arien Hackett wrote:

>>

>> cant unlock stearing nor start car

>

> --

> --

> Never argue with a dragon, for you are crunchy and taste good with  

> ketchup.

>

>

> The MB Coupes Website!

> W126 SEC Mailing List

> Postings remain property of MB Coupes, L.L.C.


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Message: 7
Date: Sat, 10 Oct 2009 11:20:22 -0400
From: Axel Wulff <axelwulff at hotmail.com>
Subject: Re: [W126 Coupe] ingnition problem
To: <mbcoupes at mbcoupes.com>
Message-ID: <BLU106-W233681DB2A4E692E61CA6AB1CA0 at phx.gbl>
Content-Type: text/plain; charset="iso-8859-1"


That is really bad news I'm afraid.

 

You'll need to be able to unlock it to remove and replace the lock
cylinder.

 

If you can't wiggle it open, or find someone who can pick the lock for
you, it's almost World War III to remove the lock and half the dash will
need to be dismantled.

Regards,
Axel J. Wulff
610-731-5453 Cellular
610-572-4611 Home



 


Date: Fri, 9 Oct 2009 22:19:29 -0700
From: arienhackett at ymail.com
To: mbcoupes at mbcoupes.com
Subject: [W126 Coupe] ingnition problem





cant unlock stearing nor start car
 		 	   		  
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Message: 8
Date: Sat, 10 Oct 2009 11:39:41 -0400
From: Dick Spellman <dick.spellman at gmail.com>
Subject: Re: [W126 Coupe] ingnition problem
To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>
Message-ID: <4AD0AABD.4010702 at gmail.com>
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End of MBCOUPES Digest, Vol 63, Issue 18
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