[W126 Coupe] Schematics

[chris schafer]

Excellent point!

The high cost of electronics and the significant expense of rebuilding a MB V8 will lead to the eventual demise of most of the surviving W126 cars, including many of the cars belonging to members of this board.

I hope you document, by part number, everything that goes into your swap. Better still I hope you put together a kit for the rest of us.

The aftermarket ignition is a good place to start, I've picked up a used distributor just last week towards that end.

Later,
Chris 

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
> 
> 
> 
> 
> 
> 
> 
> The MB Coupes Website!
> W126 SEC Mailing List
> Postings remain property of MB Coupes, L.L.C.
-- 
CoreComm Webmail. 
http://home.core.com
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