1988 TFI issue - Need a part number

[PetroleumJunkie412]

On my third TFI module - need to figure out which one I need. New ones are testing good, system is testing fine, but the ONLY one that works is the original. Long story short, need the part number for a spare.

Photos are attached. 1988 Ranger XLT, 2.9L, Mitsubushi FM146, 4wd, manual hubs, manual t case.

Photos are the one that came on the truck and that works "well."

Had a Wells and a (sub) Standard Motor Products on it, neither ran worth a poop.

Thanks all!

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[Paulos]

I believe the ignition modules that originally came with the Rangers actually said "Motorcraft" on them. You can try here for a Ford listing, which includes the part # and the part #'s it apparently replaces.

 

[rusty ol ranger]

Yeah, ford is proud of that shit, should have "Motorcraft" etched on the front if it was OEM.

If the modules are testing good, and you are testing them correctly, you must have a different issue.

What kind of symptoms are ya havin?

 

[adsm08]

If the modules are testing good, and you are testing them correctly, you must have a different issue.

I disagree. One, he said it will only run with one of them. Two, they are notoriously unreliable. Three, I have had many 2.9s over the years, and many TFIs that tested good at the parts store and failed to perform on the truck. The parts store tester only feeds them false signals to see if they respond, it isn't a loaded test trying to ground and fire a real coil, it's just a continuity test, so they can pass that with flying colors and still not be able to carry the load of a real system.

I have also seen once or twice that being run on a parts store tester takes a marginal unit and finishes killing it. I don't know if that is the fault of the tester, or if that is just when the thing would have finally died on it's own.


E6SF-12A297-A1A/A2A are the OEM part numbers I have.


Junkie, PM me your mailing address and I'll drop my last two remaining TFIs in the mail to you tomorrow. All my 2.9s are gone, so I will gladly pass them on so someone else. They worked when I got them, and they have just been riding around in my center console for a while now.

 

[PetroleumJunkie412]

I disagree. One, he said it will only run with one of them. Two, they are notoriously unreliable. Three, I have had many 2.9s over the years, and many TFIs that tested good at the parts store and failed to perform on the truck. The parts store tester only feeds them false signals to see if they respond, it isn't a loaded test trying to ground and fire a real coil, it's just a continuity test, so they can pass that with flying colors and still not be able to carry the load of a real system.



I have also seen once or twice that being run on a parts store tester takes a marginal unit and finishes killing it. I don't know if that is the fault of the tester, or if that is just when the thing would have finally died on it's own.

Those were my thoughts to the letter on the "checks good but won't fire the engine" ones I have here. I opened the working one, and the circuitry is nearly identical to a addressable blasting cap (half of what I do for a living). Caps/detonators will do the same thing - check "good" on a continuity test, but as soon as you pass load to them to charge and blow a fuse (initiate a "fire" in a charge), the relay/diode (depends on brand) circuit will fail, and the charges will hang. Sometimes they'll fire on a few attempts, sometimes they won't. Same principle though.

Junkie, PM me your mailing address and I'll drop my last two remaining TFIs in the mail to you tomorrow. All my 2.9s are gone, so I will gladly pass them on so someone else. They worked when I got them, and they have just been riding around in my center console for a while now.

Sent. Cannot thank you enough!!

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