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Old 09-18-2010, 08:50 PM
shamusliam shamusliam is offline
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Intermittent Ignition Problem

78 f150 4 wheel drive, 351m. Too ugly to show a picture of it. I have a problem with the truck not starting sometimes. Starting easy, running and then cutting off. Ran one day long enough for me to make two trips to the dump with no problems. When it is playing the I'm not going to start game, it seems to fire when I let off the ignition switch. I have found a wire coming off the ignition switch that was frayed, fixed that. Replaced the coil wire (it was not conducting). Replaced the ignition switch, hard wired the ignition module and replaced the coil horseshoe connector. It still just craps out sometimes and then won't start. It can be cold, hot, it doesn't really matter. It is very frustrating, please help. I do not have a test light but do have a multi meter.
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Old 09-18-2010, 09:13 PM
steponit steponit is offline
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Check the plugs on the distributor.

Sometimes they fray or corrode causing intermittent running
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Old 09-19-2010, 12:23 AM
4x4 Bart 4x4 Bart is offline
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Have you tried a different ignition module, This would be my first suspect.
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Old 09-19-2010, 08:59 PM
shamusliam shamusliam is offline
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do you mean the connector from the icm to the distributor, the one with the three wires?
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Old 09-19-2010, 11:43 PM
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76Hauler 76Hauler is offline
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my 76' had the factory electric ignition, i'm guessing the duraspark. I had some of your same problems, I fixed it with a MSD 6al ignition.
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Old 09-20-2010, 01:07 AM
sradams21 sradams21 is offline
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Smile

I had the same problem start with my 74 F100 with the duraspark electronic ignition. It turned out to be the ignition pick-up in the distributor went bad but not before taking the ignition box with it. It cost me a who woppin $53.00 to replace the pick up and box from O'reileys/Checkers.
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Old 09-20-2010, 01:08 AM
sradams21 sradams21 is offline
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Smile

Its worked perfectly since. Made the 1030mile drive front Denver, CO to south Houston, TX flawlessly.
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Old 09-20-2010, 01:08 AM
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1976, 1977, 1994, 49, control, duraspark, f150, ford, frayed, ignition, ii, intermittent, module, pickup, problem, spark

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