Would you Replace This Ignition Coil ? - Vintage Mustang Forums
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post #1 of 19 (permalink) Old 08-15-2019, 04:44 PM Thread Starter
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Would you Replace This Ignition Coil ?

I pulled my coil today in order to paint it when I noticed the cracks on the top. Yes..its original to the car and it was running fine. I have had an issue with it being slow to start when it warms up though. I am replacing it today but thought I would share this picture.
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post #2 of 19 (permalink) Old 08-15-2019, 05:23 PM
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If it were mine I would fill the cracks with epoxy, sand till smooth and then repaint. If it passes primary/secondary resistance readings and does not leak I would use it. On the other hand, new coils are cheap.

Gary
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post #3 of 19 (permalink) Old 08-15-2019, 05:29 PM Thread Starter
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Originally Posted by RV6 View Post
If it were mine I would fill the cracks with epoxy, sand till smooth and then repaint. If it passes primary/secondary resistance readings and does not leak I would use it. On the other hand, new coils are cheap.

Thats the plan. Do you happen to know the ohm values for primary and secondary ?
I juts installed a new Duralast coil and it seems to run the same with maybe a little more punch at highway speed. Im letting it sit for about 15 minutes to see how it starts.
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post #4 of 19 (permalink) Old 08-15-2019, 05:33 PM Thread Starter
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The original coil measures 1.8 ohms and 7900 ohms.
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post #5 of 19 (permalink) Old 08-15-2019, 05:36 PM
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Quote:
Originally Posted by Fitch View Post
Thats the plan. Do you happen to know the ohm values for primary and secondary ?
I juts installed a new Duralast coil and it seems to run the same with maybe a little more punch at highway speed. Im letting it sit for about 15 minutes to see how it starts.
I only have numbers for 67, but I bet the earlier coils were the same.
Primary (Ohms): 1.40 - 1.54
Secondary (Ohms): 7600 - 8800

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post #6 of 19 (permalink) Old 08-15-2019, 05:41 PM Thread Starter
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Quote:
Originally Posted by RV6 View Post
I only have numbers for 67, but I bet the earlier coils were the same.
Primary (Ohms): 1.40 - 1.54
Secondary (Ohms): 7600 - 8800
Thanks! Im a little high on the primary but its probably still OK.
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post #7 of 19 (permalink) Old 08-15-2019, 05:45 PM
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"If it were mine I would fill the cracks with epoxy, sand till smooth and then repaint. If it passes primary/secondary resistance readings and does not leak I would use it. "

I would do the same. If it still works, patch it, re-paint and re-use it. Keep a spare in the trunk just in case..

)

Tony K.



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post #8 of 19 (permalink) Old 08-15-2019, 05:48 PM Thread Starter
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Well, the new didnt fix the slow starting issue so, I'll restore the old coil and put the new one in the trunk. Thanks for the advice! Anyone know if it is supposed to be gloss black or satin black?
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post #9 of 19 (permalink) Old 08-15-2019, 05:59 PM
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I'd definitely clean it as best as you could and use a non conductive epoxy or paint. All those cracks have or probably have trapped contaninates that conduct electricity.

Tom

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post #10 of 19 (permalink) Old 08-15-2019, 06:12 PM
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Coils are consumables. If you're planning to drive the car much, I'd run the new coil and put the restored coil in the trunk to use if and when it made sense to have the "original" coil installed. Just my opinion.
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post #11 of 19 (permalink) Old 08-15-2019, 07:22 PM
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Is the motor turning over at the same speed or cranking slower after it warms up? If slower check your battery connections for corrosion. Wes
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post #12 of 19 (permalink) Old 08-15-2019, 07:38 PM Thread Starter
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Is the motor turning over at the same speed or cranking slower after it warms up? If slower check your battery connections for corrosion. Wes
It cranks at the same speed. I feel certain it is a carb issue. Its got the wrong carb on it for one thing. It came off of a later Cougar with an auto trans. Mine is a 3 speed. I finally found an original carb for mine that I should be able to rebuild. Its on it way to me. Hopefully, that will solve the hot start. I think its flooding after it sits because when it does finally start, it blows black smoke from the exhaust. Probably a leaking needle and seat.
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post #13 of 19 (permalink) Old 08-16-2019, 12:00 AM
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Caterpillar Yellow for the top of the coil in case you're interested.
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post #14 of 19 (permalink) Old 08-16-2019, 06:07 AM
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"Anyone know if it is supposed to be gloss black or satin black?"

It would be a Semi-Gloss Black.. Closer to Satin... Definitely NOT Gloss Black.

)

Tony K.
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Tony Kovar
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post #15 of 19 (permalink) Old 08-16-2019, 08:41 AM
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I ran my original until about 2 yrs ago- It began to miss a little after a 4 hr drive on a 95 deg day. I still have it- I would maybe run it but definetely get a new coil and carry it with you. In my experience- heat is the most likely time it will fail
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