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Old 01-12-2019, 07:50 AM   #1
56yblock
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Default problem with coil

hello guys
i had a problem with my coil ,
she burned with the wiring ,from the coil, to the ignition cap distributor
does anyone knows where the problem come from?
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Old 01-12-2019, 12:09 PM   #2
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Default Re: problem with coil

i post the pics
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Old 01-12-2019, 12:45 PM   #3
50fordcoupeman
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Default Re: problem with coil

I had one do that also. Never did figure out what happened. I replaced the coil and wires involved and it was still ok when I sold the car. Coils can be strange beasts!!
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Old 01-12-2019, 02:27 PM   #4
KULTULZ
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Post Re: problem with coil

What I am thinking (scary) is high secondary IGN resistance , either plug wires and/or plugs. Maybe need to perform a resistance test on the wires. What type of plug are you running? Points or PERTRONIX?


And then again it might just be a CHINESEIUM parts failure.
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The most important thing to remember is that typical kit and shop manual instructions were originally designed for mechanics that worked on these cars during a warranty period or reasonable time span from when the car was new. They do not address the problems and situations that can come up on repairing a 25-40 year old car component that may or may not be complete, original or in rebuild-able condition.


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Old 01-12-2019, 05:51 PM   #5
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Default Re: problem with coil

I had that happen on my truck with a Duraspark II. Did it once so I don't know but it was with a set of 9mm Ford Racing plug wires and motorcraft copper plugs. I always wondered if it was just a defective coil wire.
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Old 01-12-2019, 06:05 PM   #6
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Default Re: problem with coil

I'm guessing the hi-voltage wire from the coil to the distributor was old or damaged and it's resistance was much too high, so the spark leaving the coil found an easier path to ground, across the top of the coil. Possibly to the "-" wire for the distributor?
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Last edited by dmsfrr; 01-12-2019 at 10:14 PM.
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Old 01-12-2019, 06:07 PM   #7
KULTULZ
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Post Re: problem with coil

Quote:
I always wondered if it was just a defective coil wire.

Could have been a coil wire, cap or rotor and wires/plugs.
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The most important thing to remember is that typical kit and shop manual instructions were originally designed for mechanics that worked on these cars during a warranty period or reasonable time span from when the car was new. They do not address the problems and situations that can come up on repairing a 25-40 year old car component that may or may not be complete, original or in rebuild-able condition.


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Old 01-12-2019, 06:14 PM   #8
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Default Re: problem with coil

Quote:
Originally Posted by KULTULZ View Post
Could have been a coil wire, cap or rotor and wires/plugs.
Possible, but I changed just the wire out and it never did it again.

Wont be a problem for me when I put my new engine in, I got a new dist for the truck with a steel gear for a roller cam and I have a new NOS cap, cap adapter, and a motorcraft rotor to go on the new engine.

I just thought it odd that it just did it with no sign. It didn't burn it two on mine it just when I pulled the coil wire off it actually fell apart and was no good then. Think I was pulling the wire off to pull the coil to have a easier time pulling the valve cover.
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Old 01-13-2019, 06:35 AM   #9
56yblock
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Default Re: problem with coil

thanks for the answers ,i changed by the new one and now it start and runs good, maybe i'll must to change the points and the condenser?
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Old 01-13-2019, 08:09 AM   #10
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Default Re: problem with coil

even with the burned coil the car to restart but there were small sparks + or - terminals, is it strange?
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Old 01-13-2019, 12:26 PM   #11
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Default Re: problem with coil

Quote:
Originally Posted by 56yblock View Post
even with the burned coil the car to restart but there were small sparks + or - terminals, is it strange?
Not strange at all. The burned / carbonized surface of the coil is now more conductive than it was, it's no longer an insulator.
You need a new coil, and all new spark plug wires, if the condition of the coil wire is any indication.
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Last edited by dmsfrr; 01-13-2019 at 05:50 PM.
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