73-87 Chevy _ GMC Trucks > Fuel Systems and Drivability
Writeup PC ALDL (OBD 1) Diagnostic Software and Interfaces
LTZ C20:
--- Quote from: ehjorten on February 18, 2016, 01:42:50 PM ---I have a 1991 V3500...figure that one out! As far as I know, there is not software to read that year of ECM. No one has de-compiled that ECM.
--- End quote ---
Is it a TBI small block or big block or diesel? Mine is an 89 but I can communicate with itby selecting 89, 90 or 91 on the scan tool. Is there any way you can change the program options to think it's Annan 89 or 90? It may work. Sometimes we have that issue even with new cars, it may be on 07, but for some reason 07 won't work with the function won't work with the function we are trying to preform, selecting an 06 or 08 makes it work fine. Sometimes it's a scan tool glitch, sometimes it's a programming thing in the computers that's just because of some weird voodoo magic from when the car was built at the factory. Doesn't happen alot tho, only every once in a great while.
hatzie:
--- Quote from: ehjorten on February 18, 2016, 01:42:50 PM ---I have a 1991 V3500...figure that one out! As far as I know, there is not software to read that year of ECM. No one has de-compiled that ECM.
--- End quote ---
Give this a shot.
http://www.gearhead-efi.com/Fuel-Injection/showthread.php?3575-ECU-Swap-On-1991-TBI-454-4L80E&s=b394995504959ce75540d5e370a9134a
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