Possibly ignition switch, Power (12 volts) going to distributor goes through ignition switch.If you read voltage on the primary side of the coil, with the ignition key on, can you read 12 volts, maybe a little higher? If not, that's pointing to a problem. Good luck.
I have power at primary lead from ignition but not getting any from ignition module when key is on.
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Check to see if your truck has a crankshaft position sensor, its usually located behind the harmonic balancer or right near there, if the sensor went bad or if the wiring got messed up there will be no signal to the ecm telling the ecm when to send spark to the coil. the crankshaft position sensor is responsible for telling the computer when to fire the spark plugs based on rpm and timing. check the wires on the crankshaft position sensor, if they look fine, replace the sensor, hope this helps!
No crankshaft sensor on 91. But there is a spark control module in addition to the ignition module. Could that be something to check?
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Is it possible that a bad oil pressure switch would disrupt signals to ignition control module?
There's a white wire that runs from ignition control module to ECM ignition control (IC) pin. Is that wire sending power/signal to or from ECM?
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