Hi, I have a 350 in a c10 I was out one night and the truck cut off on me and it didn't crank back up got it towed home the next day it fired right up but then it happened again ended up having to replace the ignition control module because it tested bad at autozone since then I have replaced everything in the hei distributor and it continues to give me the same problems one day its firing the next its not any ideas would be helpful thanks
did you replace or inspect the distributor rotor. those burn thru..
did you pull the coil cover and inspect the wiring to the coil in the top of the cap.. burned wires indicate missing ground strap under the coil or a broken wire.. even a loose 3 wire harness hold down screw..
with the coil cover off.. stick a test light into the top of the cap where the red wire to the coil is.. and where the pink wire from the ignition comes up..
turn the crank to bring the mark on the harmonic damper to the TDC pointer.. is the rotor pointing at the #1 wire position in the cap or the #6 ... you don't have to turn it.. one turn it lines up #1.. the next crank turn it lines up #6..
you may want to inspect the pickup coil for cracks.. you can see them from the side in the second layer..
Thanks for the response its a 86 c10 the last time I checked no wires where burned or cracked I've replaced the control module,pick up coil,ignition coil,rotor button, distributor cap and the capacitor
i've had ign control modules test bad but only to find that was not my only problem. In my particular case, the ign switch turned out to be the culprit.
Hit the basics first like making sure your battery cables and leads are tight, not corroded, not shorted. Do the same for your ground wires and making sure the grounds are clean, tight, and not rusty. If you're good there, check the coil, it should be at a minimum running 5000 OHMs.
I agree, considering the intermittent nature of the problem, parts you have replaced and the age of the vehicle it sure points to a simple ignition switch failure.
Replace it before doing anything else to eliminate it from possible sources, a 30 yr old high usage switch should be changed regardless.
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