[W126 Coupe] Schematics

[Mike R.]

Which is a significant part of the logic behind my LS6 transplant. No EZL,
no OVP, don't need a fuel pump relay with a circuit board in it, no cruise
control amp, etc. etc. etc.

 

Most of the troublesome MB electronics are going to be removed, replaced
with a 2002 computer that costs... really!...... $180. A seven CD set I
found on EBay for $24 seems to be the service instructions and schematics
for every GM vehicle from 1980 to 2005. Most of the older stuff is service
bulletins and campaigns, but the newer cars have a lot of info there,
including the schematics I need for this conversion. Here's the weird part,
a new engine wiring harness from GM for the LS6 is $1500, $750 from a
high-line custom builder, and around $400 from a regular supplier of
harnesses. Lot more money for the wiring than the computer. I purchased
(non-EBay) a used GM cruise control assembly for the LS6 for $75 - bolt it
to the firewall, run the wire cable to the throttle block, plug it into the
engine computer, done.

 

Some things MB designed for my '87 SEC are still applicable today, but most
of their electronics are not. Rather than duplicate the old stuff, we should
be working toward replacing it with newer electronics. Nathan, I believe,
has found an aftermarket ignition system (MSD?) that replaces the EZL. 

 

Later,

Mike R.

 

  _____  

From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com]
On Behalf Of chris schafer
Sent: Monday, March 27, 2006 7:09 PM
To: Mercedes Coupes Mailing Lists; Mercedes Coupes Mailing Lists; Robert
Karl Stonjek
Subject: [W126 Coupe] Schematics

 

This subject is important enough to spin it off into it's own thread.

I'm sorry to say it Richard but I don't have a background in electronics. I
have however been thinking about this for quite some time. 
If we are going to own and use these cars over a long period of time then we
are going to have electronic failures. It is going to happen. We can pay a
lot of money for replacement parts if they are still available or we can,
what? Pay someone to rebuild the part in question or do it ourselves.
The price to rebuild electronics, I suspect, may be based on the price to
replace the electronics. Seems like a fair price to get a working component
unless you know how much electronics cost.
There are lots of stories out there about a common failure in a particular
car that costs three or even four figures to fix by a professional when it
can be done at home with a meter, a soldering iron and a ninety cent diode.
A new EZL goes for $1300! A common failure is heat related and the fix is
the replacement of some small components inside the EZL.
Almost a no brainer.
The challenge is finding schematics for EZL's and all the other electronics
that WILL give us trouble in the future. There are many variations on each
component.
For all the people that are on this list no one has reported having any
electronic component schematics at all.
This is a big gap in our knowledge.
One that we will all pay for sooner or later.

Regards,
Chris


Chris, 
> A package of handy schematics is a terrific idea. 
> 
> I too have a background in electronics. I also I have a 
> dead bosch and Seimens EZL on the 
> shelf that I have wanted to rebuild but I just have not had 
> the time to research it,
> undo the torx screws and grind off the rivets. 
> 
> I;m looking forward to your details of your explorations. 
> 
> -RPH
> 
> 
> 
> From: mbcoupes-bounces at mbcoupes.com 
> [mailto:mbcoupes-bounces at mbcoupes.com] On Behalf Of chris 
> schaferSent: Sunday, March 26, 2006 8:26 PMTo: Robert Karl 
> Stonjek; Mercedes Coupes Mailing Lists; MB CoupesSubject: Re: [W126 
> Coupe] CIS-E Blues
> Robert said, "What I need is a circuit diagram of the CIS-E itself, 
> or any similar CIS-E device (one of the Porches used the same unit?). I
can then 
> test my theories quickly and simply, as electronics is my area of 
> expertise."This seems like an important issue for this group to put 
> their collective minds to work on. The electronic components in these cars
are 
> going to wear out and need replaced and we all know the cost issue.Does 
> anyone know if Siemens or Bosch still produce our EZLs or do 'new' ones
come 
> from a rapidly depleting stockpile? We should try to put together a 
> collection of schematics relevent to these cars. We should also document
common 
> electronic fixes, work arounds and modifications.Collecting modern cars 
> requires an adeptness at electronics not needed with older 
> machines.Regards,Chris Schafer -- CoreComm Webmail. 
> http://home.core.com
> 
> The MB Coupes Website!
> W126 SEC Mailing List
> Postings remain property of MB Coupes, L.L.C.
-- 
CoreComm Webmail. 
http://home.core.com

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.pairlist.net/pipermail/mbcoupes/attachments/20060327/87a66766/attachment.htm