I would greatly appreciate some insight into this problem with this truck. I have a 1994 Chevy S-10 with a z code 4.3L TBI on an auto. This truck was runnning fine, I parked it and shut it off and 3 hours later it would not start.
It does turn, the starter is strong.
It is getting power (+12v on the plugs) to the injectors, as well the resistance on the injectors themselves are fine. There is fuel line pressure to the throttle body. There is voltage going to the coil, but no spark coming out.


#10 Fuse labled ECM/IGN is good, has +12v as checked from the hot side of the fuse socket to ground.

Replaced:
Coil
Fuel Filter
Ignition Control Module
Fuel Pump

Any Ideas?

1) Check for ground pulse at the dark green and dark blue wires at the injectors while cranking.

2) Does the fuel pump run for 2 to 3 seconds when the ignition switch is initially turned to the RUN position?

3) Does the fuel pump run continously while cranking?

4) What is the fuel pressure with the ignition switch in the RUN position, (engine off) when the pump is running?

5) Does the pink wire at the ignition coil show battery voltage when the ignition switch is in the RUN and START positions?

6) Does the white wire at the ignition coil pulse ground while cranking?