87 Chevy K-5 Blazer. No spark at plugs.

10

Asked by Jan 20, 2016 at 11:41 PM about the 1987 Chevrolet Blazer Silverado 4WD

Question type: Maintenance & Repair

Installed new distributor, gas tank, fuel pump, plugs, wires and got it cranked.
Been sitting for 14 years. Rats chewed a good portion of the engine
compartment wires. Repaired all of this. Drove it from shop and it just quit. No
spark at the plugs. Can a bad ground cause this or has my ignition module
burnt out?

3 Answers

21,085

more a bad connection somewhere maybe, the module would be worth trying for the age of it

1 of 1 people found this helpful.
69,385

Either a bad ground or the ignition module will cause a no spark condition. Check the wiring down by the starter as well. The ignition switch gets power from there and sends it to the ignition coil. But remember that the wire going to the ignition coil is a resistor type of wire that drops the voltage down to 6 or 8 volts DC when the engine is running. You have 12 volts when cranking (ignition in the start position) but 6 to 8 when running. HTH. -Jim

10

I had the module tested at the local parts house and it was good. While doing some more testing, I noticed that while turning the engine over, there was arching between the ignition coil body and the plate pack that surrounds the coil so before I go any further, I am going to change the coil and see what happens.

1 of 1 people found this helpful.

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