Quote:
Originally Posted by XfireZ51
The LT5 ECM and engine controls are a derivative of the L98 logic. The ECM ONLY controls the secondary injectors by energizing the secondary relays sending power to the secondary injectors. It essentially provides the ground
(-) for energizing the secondary modules. The pulsewidth for the secondary injectors is controlled or “shared” w the primary injector signal from the ECM. Once engaged, the ECM basically cuts the pulsewidth by 50% so two injectors now share the fueling needs of the motor.
So NO, a simple change would not do the same thing. The secondary module substitutes for injector drivers.
|
So if the ECUs are the same except for the PROM, and the 93-95 cars don’t have a secondary injector modules, it stands to reason that with a reflash and wiring change, the 90-92 cars wouldn’t need them either. Unless the 93-95 cars are doing something else.