Is there a difference in the PROM chips in the '86-'89 ECM's (1227165)? I am asking because I got one cheap in a junkyard, but I don't know if it needs a different PROM or not.I see that the actual application for that ECM was quite varied.
Thanks!!

 

There are some differences, such as 89 having VATS.

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1989 IROC-Z 5.7L
NOS 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System

 

My main question though is:
Will I need a different PROM, if it is pre-89 and say....out of something with 6 cylinders instead of eight? If so can the PROMS be differentiated?

 

You need to differentiate between the prom and the carrier with the "limp home" chip-Yes you need a carrier with at least a close match for the limp home mode to work half decent; definitly v-8 for a v-8. The prom itself is removable and can be reprogrammed to 'bout anything you want. The prom itself should have a code on it eg. auyp etc. that you can look up and see what it came out of. Check the diy-prom area and run a search; I sure you'll find all your answers.


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