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Re: 91 4.3 Injectors Will Not Pulse
The white wire at the ignition module sends a pulsed ground signal to the PCM while cranking and while running. The PCM sends a pulsed ground to the injectors through the dark blue and dark green wires, (gounding them out will open the injectors and they will dump fuel). The pink wire at the ignition coil must show battery voltage with the ignition in the RUN and START positions. The white wire at the ignition coil must show a negative pulse while cranking. Post your results for each wire.
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You have to know how it works,
to figure out why it doesn't.
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