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351M No Spark Condition...

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Old Nov 23, 2010 | 07:43 PM
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351M No Spark Condition...

I was driving along the other night, and my engine died for a couple of seconds then started running again(On its own). About a mile down the road, as I turned at an intersection, the engine died again. I coasted to the side of the road, turned the key and it started right up, so off I went. Less than a mile from that point the engine died again, leaving me stranded and waiting on a tow. I am getting zero spark. Ive tried a new ignition module, and have installed a new distributor and coil. I also swapped iginition wiring harnesses from another truck. By the way its a '78 F-250 with a 351M. Any advice would be much appreciated! Thanks fellas.
 
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Old Nov 23, 2010 | 07:50 PM
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check the wires at the coil connection and about 2" above it. Fords wiring harness' are famous for rotting out
 
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Old Nov 24, 2010 | 05:05 PM
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From: Irondale, Al.
Originally Posted by Truckmano5
I was driving along the other night, and my engine died for a couple of seconds then started running again(On its own). About a mile down the road, as I turned at an intersection, the engine died again. I coasted to the side of the road, turned the key and it started right up, so off I went. Less than a mile from that point the engine died again, leaving me stranded and waiting on a tow. I am getting zero spark. Ive tried a new ignition module, and have installed a new distributor and coil. I also swapped iginition wiring harnesses from another truck. By the way its a '78 F-250 with a 351M. Any advice would be much appreciated! Thanks fellas.
Check your battery cables, they can appear fine, but be bad internally.
 
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Old Nov 24, 2010 | 10:52 PM
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I already have new battery cables and a new Interstate battery. I checked the voltage at the coil with the switch on: 12 volts on positive to ground and negative to ground, which usually indicates a good coil. I'm lost on this so far.
 
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Old Nov 25, 2010 | 07:47 PM
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not exactly?

Originally Posted by Truckmano5
I already have new battery cables and a new Interstate battery. I checked the voltage at the coil with the switch on: 12 volts on positive to ground and negative to ground, which usually indicates a good coil. I'm lost on this so far.
On the coil for proper inspection is to check for voltage like you did. 12 volts is good but now you need to check ohm's. across coil. positive on positive and then neg lead inside coil. you should get a reading around.05 ohms. Also check you distributor inside internals make sure nothing cracked. the distributor spring loaded contact in top of distrib could be broke/cracked. good luck just things I've learned along the way.
 
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Old Dec 12, 2010 | 03:45 PM
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I installed a reman distributor about eight months ago. I wonder if it has fallen apart already. Anyone heard of this happening on a regular basis?
 
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