747 ecm ? Vs 1226867

[Bruce Plecan]

-----Original Message-----
From: Stowe, Ted-SEA <StowT at PerkinsCoie.com>
To: 'diy_efi at efi332.eng.ohio-state.edu' <diy_efi at efi332.eng.ohio-state.edu>
Date: Tuesday, November 03, 1998 2:53 PM
Subject: 747 ecm ? Vs 1226867


>howdy.
>
>I am putting around putting the pieces together to put my 85 sunbird TBI in
>my mg, however I worry about the fact that I see more dialog here about the
>'747 ECU than the one I have, 1226867(4cyl). should I scrap my ECU and go
>find a 747 and have someone program a prom for me for 4 cyl  ? or stand pat
>with what I have ?

There is no 4 cyl application of the 7747 ecm.  No wiring diagram
of what it would look like.  The 730+165 have been used in 4 cyl
TBI but use 128+256K proms.  Long term is probably best with
what ya have.

 I liked the illusion of safety in that it came from a 1.8
>liter engine and I now have the manual trans eprom in it. I would think the
>'747 wouldn't know about my particular throttle body ?
>
>thanks, Ted Stowe
>
>-----Original Message-----
>From: Don.F.Broadus at ucm.com [mailto:Don.F.Broadus at ucm.com]
>Sent: Tuesday, November 03, 1998 8:40 AM
>To: diy_efi at efi332.eng.ohio-state.edu
>Subject: RE: 1227746 ECM
>
>
>Thanks for the advice, I'll stick with the 7747. Where could I get a 350
>auto PROM for a 7747, I'm helping convert a 1981
>Chevy truck to TBI. The ECM I have now is a 7747 ATKX from a 1990 Astro Van
>4.3L V6 .
>
>
>Thanks for the help.
>
>Don
>
>
>
>
>
>
>
>
>
>
> -----Original Message-----
> From: Bruce Plecan [SMTP:nacelp at bright.net]
> Sent: Monday, November 02, 1998 3:46 PM
> To: diy_efi at efi332.eng.ohio-state.edu
> Subject: Re: 1227746 ECM
>
>
> -----Original Message-----
> From: Don.F.Broadus at ucm.com <Don.F.Broadus at ucm.com>
> To: diy_efi at efi332.eng.ohio-state.edu
><diy_efi at efi332.eng.ohio-state.edu>
> Date: Monday, November 02, 1998 4:06 PM
> Subject: 1227746 ECM
>
>
> >I found a 7746 ECM ( ACDW)  at the local U-Pull- IT .   The donor
>car was a
> >4.3L TBI 1987 Grand Prix this set up seems to be the same as a 1987
>Astro
> >Van with a 7747 ECM  are the ECM's plug and play ?
>
> You really need to get a wiring diagram out, and look.  There are
> sometimes small but meaningful changes from ecm to ecm.  They
> are not the same.  In the passenger car versions they use a IAT.
> Also, the tables will be moved around some I beleive.  If you want
> to tinker with a 747 you need to have a 747.  Some of the advanced
> guys can play some games with adapations, but if your just starting
> out learn the baxics first.
>
> I would also appreciate
> >some help
> >With downloading Bin files, Can a PROM be burned from the data in
>the
> Bin's.
>
> When the correct corresponding parts are used, yes.
> >?
> >
> >Thanks
> >
> >Don
> >
>