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-=Jeff=- · 05-03-2018

Because the OEM ECMs have enough inputs and outputs..

So the PROM then Defines the ECM's inputs and outputs.

if you mapped it out the Power key, knock and EGR use pins that are unused on the 1990..

Functionality was there in the ECMs, just not used

05-03-2018	#22
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,163	Re: secondary injector module/ecu Because the OEM ECMs have enough inputs and outputs.. So the PROM then Defines the ECM's inputs and outputs. if you mapped it out the Power key, knock and EGR use pins that are unused on the 1990.. Functionality was there in the ECMs, just not used __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978