Substitutions

[Brent]

Welcome Dave.  It's my opinion that the easiest option in your case is to
buy a 89-92 TBI Fbody ECM #1228746.  It will plug right in and run (provided
you have the proper non-vats, 5spd bin).  The editor is availible from
Tunercat ($61).

The next easiest option is buying a 1227747 ecm.  You must cut pins C15 and
D15.  Then swap pins A11 and D2.  Get the truck bin that most closely
matches your setup.  Tunercat has this editior as well.   You do lose
canister control, and IAT and maybe more.... ???

The 7747 has been documented and disected more than the 8746......

HTH,
Brent
-----Original Message-----


>   Hi, all. I'm new to the list. Hoping to find lots of good info. I'm
>a long-time GM wrench, and this sort of programming and EPROM burning
>are nothing new. But I'm fairly clueless (I've found out) about the
>various programs, and I'm confused.
>
>   I've got an '88 L03, 5-speed manual trans, F-Body with knock
>sensor. Program ID code (best I can determine until I copy a binary
>from the PROM) is $4D. I've been all over-- TunerCat, etc-- and can't
>find an ECM definition file for this program.
>   I found a $61 ECU for 89-92 L03 with AUTOMATIC trans. Otherwise it
>looks the same to me.
>   Are these programs interchangeable? I mean, can I modify the $61 to
>ignore its automatic transmission settings, and run with my manual
>trans, in my 1228063 ECM?
>   I also considered getting a 747, but I notice its program is for
>automatic trans, too.
>   Do I have to come up with a $4D, or can I substitute another
>program as a base to start tuning? My main concern is the transmission
>difference (so far).
>
>   Or does anybody out there have a $4D ECM definition?
>
>Dave Haggard



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