No spark issue

mopar Joe 65

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My 65 fury lll won’t start I drove it to the restaurant and went to leave , no spark ? I towed it home and put it in the garage and check a few things , the coil has power to it with the key on but no spark to the plug. I pulled the plug out and laid it on the exhaust manifold when I crank it no spark ? The crazy thing is when I turn the key off I get a spark ? I tried a different coil same thing. I think my control module is ok ? I made sure it has a good ground, I would be grateful for any help.
 

mopar Joe 65

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I don’t think so,I also tried a different one? I think I will bypass it and see if that helps ? From what I understand with my electronic ignition I don’t need it anyway.
 

thethee

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I don’t think so,I also tried a different one? I think I will bypass it and see if that helps ? From what I understand with my electronic ignition I don’t need it anyway.
What kind of ignition are you running? With a conversion I'd suspect the ECU also
 

Big_John

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That's classic bad ballast resistor symptoms. If you don't need it with your system, don't use it.

If you do need it, simple to check with a multimeter. Unhook the wires and check for continuity across the resistor. No continuity equals bad resistor.


EDIT: The heat is getting to me... That's a classic DUAL ballast resistor problem. A single ballast resistor has the opposite problem where it starts and then dies when you left off the ignition switch.

Sorry for any confusion... It's been a long day...
 
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fury fan

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Based on what you've described, I would suspect either the ECU or the VR sensor in the distributor.
 

1970FuryConv

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My 65 fury lll won’t start I drove it to the restaurant and went to leave , no spark ? I towed it home and put it in the garage and check a few things , the coil has power to it with the key on but no spark to the plug. I pulled the plug out and laid it on the exhaust manifold when I crank it no spark ? The crazy thing is when I turn the key off I get a spark ? I tried a different coil same thing. I think my control module is ok ? I made sure it has a good ground, I would be grateful for any help.
Take a test light and check the distributor. Output turns ground off and on. I don't know Proform, but computers need the on/off ground to actuate spark using coil primary negative. I'm betting bad magnetic pickup.
 

mopar Joe 65

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Thanks for the info guys , today I replaced the ignition switch the ballast resistor and the coil , still no go ? I guess I will replace the control module if that don’t fix it I might put my duel point distributor in it before I buy another electronic one .
 

57fury440

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You said you get spark with the key off? What is getting spark with the key off? Is it possible the wire to the distributor has a break in it?
 

mopar Joe 65

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Answer to your question about spark, when I crank the engine no spark to the plugs when I turn off the key the plug fires ?
 

CBODY67

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Answer to your question about spark, when I crank the engine no spark to the plugs when I turn off the key the plug fires ?
When you move the key from the "Start" position to the "Run" position or from "Start" to "OFF"?
 

mopar Joe 65

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Hi guys , I found the problem it was the ecu , apparently these are only good for about 100 miles ? Thanks for all the help.

58577674-9857-482C-BFE9-06977BCE65F7.jpeg
 

65sporty

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Make sure the ECU has a good ground when mounted, I installed a proform kit on a 87 Dodge D150 and added a ground wire to one of the mounting bolts just to be sure it had a good ground. As far as I know my customer is still driving it
 
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