different ECM's or ECM differences?

[TBK]

-----Original Message-----
From: Jason Weir <jweir at worldnet.att.net>
To: DIY_EFI <DIY_EFI at efi332.eng.ohio-state.edu>
Date: Sunday, July 26, 1998 2:20 PM
Subject: different ECM's or ECM differences?


>almighty, Diacom lists 3 different configurations for the 91 4.3  (eng
>code Z and year code M) they are as follows,
>
>1991 GM/Chevy Truck 4.3 V6
TBI
>1991 Truck Lt-Duty Emisn 4.3 V6

Vortec or CPI
>1991 GMC/Chevy Turbo Truck 4.3 V6

Serious MPFI engine

>
>My question is in 91 did they offer something besides TBI.
Yes, there was the TBI, Vortec, and Turbo Intercooler Syclone engine

>If they didn't what would be the difference in the ECMs.
747 is a C3 160 baud ECM
748 is the Syclone/Vortec P4 8192 baud ECM.

>The reason for this question is that I use the first option (GM/Chevy
Truck) but the second
>option show alot more data, such as spark advance in degrees and knock
>retard in degrees and 10 other things that my choice doesn't offer.  The
>first option is the only one that will connect to my ECM.  I am
>wondering if there is another 91 TBI ECM out there that has these added
>outputs in the data stream.. maybe at 8192 instead of 160? Would it
>still be a 747 or something else??? I can see the smoke coming now....

Let me check. There may be a P4 ECM that will work. The 7730 should
actually. Let me check.

>Jason


TK

>
>--
>Jason Weir
>88 Wrangler - 258 Chevy TBI
>Fayetteville, North Carolina
>http://home.att.net/~jweir
>mailto:jweir at worldnet.att.net
>
>
>