Electronic ignition questions

[sgtpoliteness]

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So, I'm just going through my ignition system cleaning contacts and such because I've got a good miss under heavy load. My question is if I want to replace this HEI style cap what do I ask for?

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Also, there are no markings on this coil, anyone recognize it? It gets a signal from the MSD 6 box.

[Stuka]

That's not anHEI style cap, it's a TFI cap. Any late 80's ford V8 cap should work.

The coil is also a TFI coil. And again, late 80's ford.

I think most people get them for 460's.


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[sgtpoliteness]

Ohhhh!! That's TFI, cool! Thanks.

[sgtpoliteness]

Ok, yup. All that is on a '88 Ford Super Duty 460. Thanks!

[Stuka]

Ok, yup. All that is on a '88 Ford Super Duty 460. Thanks!

Well, it would be an F250 or F350, Super Duties did not come out until '98


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[sgtpoliteness]

Ah, that makes sense.

[jsinajeep]

On the coil, if you look down in the place where the wires plug into I think you will see the +/-

[lindel]

Yup, hook up the TFI coil with the same polarity as the original coil and you'll be good to go. A big advantage to the TFI coil is that you can run it at a full 12V, it's not limited to the 8V that the factory ignition box puts out.

[sgtpoliteness]

So, looking over some tech stuff does the TFI coil need its case grounded? It pretty much just lays, loose, on the intake manifold.

[Gumby]

I would not just let it lay somewhere in the bay. I would build a bracket for it or you could get a bracket from a ford vehicle and make little mods to mount it in your vehicle. I build one yesterday and it sits in the same spot as the stock unit.

[sgtpoliteness]

Yeah, I assumed as much. A bracket is on the long list of piddly things to take care of. I was just wondering about the electrical importance of having it well grounded.

[lindel]

I've never grounded any of mine. I've also run all the TFI coils I've installed with full 12V.

[sgtpoliteness]

So, can I, as a diagnosis process, eliminate the MSD box and run 12v to the TFI coil? A Jeep buddy of mine thinks my high rpm/high load miss could be the box.

[lindel]

Yes. You can hook up the TFI coil per the stock wiring, or you can connect it to a 12V source that is hot with the ignition switch in start and run. I wouldn't use the battery as that source, but a switched source off of the ignition switch.

[sgtpoliteness]

Thanks! Happy Thanksgiving everyone!