Question about 1991 Chevrolet Silverado 2500

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I have a 1991 chevy truck, I am getting no spark. I have changed the ECM, distributor and coil. still no results. I have no idea of what to do.

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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.

Posted on Jun 29, 2009

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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!

Posted on Jun 29, 2009

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