different ECM's or ECM differences?

[ECMnut at aol.com]

Hi Jason.
The 91 4.3 Turbo truck (VIN "Z", port inected) uses a 7749 ecm.
Same ecm as port injected 2.0 Turbo Sunbird.  8192 baud ALDL.
Not sure what ECM was in the others you mentioned.
HTH
Mike V.


=================================================
In a message dated 7/26/98 5:11:32 PM Eastern Daylight Time,
jweir at worldnet.att.net writes:

<< 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
 1991 Truck Lt-Duty Emisn 4.3 V6
 1991 GMC/Chevy Turbo Truck 4.3 V6
 
 My question is in 91 did they offer something besides TBI.  If they
 didn't what would be the difference in the ECMs.  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....
 Jason
 
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