[W126 Coupe] Engine stumbles, antenna chews the antenna mast

[Mike R.]

Try 1/2 turn clockwise on the CIS mixture allen and see if that doesn't
improve the stumble.
 
Later,
Mike Ramay
(702) 494-8056
 
From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of Axel Wulff
Sent: Sunday, May 10, 2009 4:15 PM
To: mbcoupes at mbcoupes.com
Subject: Re: [W126 Coupe] Engine stumbles, antenna chews the antenna mast
 
Thanks for all the responses for the antenna.
 
I removed it this afternoon and opened it up to see if I could figure it
out.
 
It is a pretty simple mechanism. There are 5 wires going to the antenna, but
they all connect to the printed circuit board (PCB) and there are only two
wires going to the motor from the PCB. I guess the PCB is monitoring the
draw of the motor and shuts it down when it pulls too much power. There is
nothing supervising the nylon rope of the mast.
 
I couldn't see any cold solders or burn marks on the PCB so I guess it is
time for a new antenna.
 
Any other ideas on the engine stumbling?

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



 
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From: pearsonn51 at msn.com
To: mbcoupes at mbcoupes.com
Date: Sun, 10 May 2009 16:19:37 -0400
Subject: Re: [W126 Coupe] Engine stumbles, antenna chews the antenna mast

I had problems similar to yours in a 190e and found out after trouble
shooting everything in the trunk that the switch in the dash was bad. It had
corroded up and caused the trunk system not to work right.
 
  _____  

From: axelwulff at hotmail.com
To: mbcoupes at mbcoupes.com
Date: Sun, 10 May 2009 10:54:33 -0400
Subject: Re: [W126 Coupe] Engine stumbles, antenna chews the antenna mast

Ian,
 
I did not do anything to the electronics while removing the old antenna mast
and inserting the new one. After it did not want to extend, I simply
detached the 6-pin plug on top of the antenna body and reattached it, just
to see if I could get it to re-set itself. That didn't work, so I had to
pull the mast out again and re-insert it. Now it goes up and down, but does
not stop retracting.
 
I'll take the antenna out to see if I can't figure it out.

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



 
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From: igunn at bmts.com
To: mbcoupes at mbcoupes.com
Date: Sun, 10 May 2009 10:01:20 -0400
Subject: Re: [W126 Coupe] Engine stumbles, antenna chews the antenna mast
The antenna, I can't remember what's in it, been a while since I had one
apart, but there is a switch/switches inside that trigger an open circuit
when the antenna reach's its limits open and closed. Some use a small micro
switch that gets hit when the reel reach's furthest close and open, the reel
carrier has a spring loaded pivot that when the cable is retracted, or
extended, it pivots and hits the switch, cutting the power, through a set of
small relays.
 
Was the electrical connection plug and play or did you have to mess with the
wiring? Did you connect the antenna wire from the new system? I suggest that
you bench the antenna, I'd be surprised if the mast is too short, because it
doesn't matter as the cable reach's its limits and ratchets up the reel
carrier. Do you have the electrical schematic? It will show you what each
one of the wire does.
----- Original Message ----- 
From: Day . <mailto:RDay at drc.com>  Ralph 
To: Mercedes Coupes Mailing Lists <mailto:mbcoupes at mbcoupes.com>  
Sent: Sunday, May 10, 2009 9:20 AM
Subject: Re: [W126 Coupe] Engine stumbles, antenna chews the antenna mast
 
Axel,
 
Sounds like the antenna may be too short.
 
The stumble sounds like what I experienced with both my 84 500SEC and 91
560SEC.  This happened when each of the cars had about 150K miles.  We never
found the problem, but suspect the vacuum line to the transmission.
 
Ralph D. Day
Senior Program Manager/ASQ LSS Certified Black Belt
MDA Master Black Belt
Dynamics Research Corporation
(301) 275-9030 (cell)
 
From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of Axel Wulff
Sent: Saturday, May 09, 2009 9:46 PM
To: mbcoupes at mbcoupes.com
Subject: [W126 Coupe] Engine stumbles, antenna chews the antenna mast
 
Hi everyone,
 
I'm still doing battle with the audio make-over I embarked on about six
months ago. It is coming along and I have CD/DVD and iPod sound again for
the first time since December.
 
I changed out the antenna mast with one I picked up at the local (Devon, PA)
MB dealership. I got the old one out without a hitch and the new one went in
fairly smoothly as well.
 
The first sign of trouble was that the new mast did not rise after the
installation.
 
I got it to go up and retract, but every time it goes down, the motor
continues to spin after the mast is fully retracted and makes an infernal
noise spinning against the nylon rope.
 
Anyone got an idea of what is going on?
 
Also, my M119 engine has developed a pronounced stumble. I happens when the
engine has not fully warmed up and when applying the throttle after idling.
 
I strongly favor a fuel over spark as the cause, but am open to ideas about
what solutions to try.

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



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