Stock EFI system on an L28. I have swapped to a gm style HEI module. New Harness.
The injectors will not fire, pin 10 on ecu is seeing 12v, all injectors have 12v on both pins reference to ground, and the car runs fine with starter fluid. I know i have spark, the tach wire is wired from ECU pin 1 to the negative terminal on the coil. Do i need to wire in a dropping resistor for the ecu to see the pulse? Does the car need to see a start signal to begin firing the injectors? Does the ecu need to see 12v through the air valve from the fuel pump? any help would be greatly appreciated.