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post #1 of (permalink) Old 04-21-2003, 09:40 PM Thread Starter
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Burning up ignition modules........

I've gone through 2 modules in the last 3 weeks. I always carry a spare and have the typical symptoms. Once the engine is heated up and I shut it off for less than 15 minutes, I run into problems. When I try to start her, she'll run for a minute then leave me high and dry. After trying to start it for a while I swap to my spare module and she starts right up. I've had to swap in 2 new modules in the last 2 weeks. Each one only lasting a week. Did I just get a bad batch of modules or do I have a bigger problem? I'm using the $15 wells modules from AutoZone. Good thing they have a lifetime warranty. [img]images/graemlins/grin.gif[/img]
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post #2 of (permalink) Old 04-21-2003, 10:48 PM
 
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Re: Burning up ignition modules........

I would say you have other issues ...Those modules are crappy but should last more than a week.The one I put in lasted about a year or so...Then I swapped in a MSD I had bought used off a friend from work.
Mine would stall out while driving ,and if you left it in gear would eventually jump itself...but that gets kinda spooky in fast moving traffic.
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post #3 of (permalink) Old 04-22-2003, 12:52 AM
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Re: Burning up ignition modules........

I see you "Tr'd" it.

If you are using the E coil - they have a lower primary resistance - you are pushing your luck.
The standard Ford modules weren't designed to carry that much current.
If you want to use the E coil, use the DuraSpark II module that can take it. Or switch back to the coil that module's supposed to work with.

It's kinda like trying to bring in a shark with a line that was designed for Trout.

Yes, you might be able to do it, but ----?
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post #4 of (permalink) Old 04-22-2003, 08:03 AM
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Re: Burning up ignition modules........

I had a similar problem once. Short someplace. It would start 'em smoking after five minutes with the key on. So, in typical fashion, I avoided the real issue and just did the GM HEI conversion and tossed the Wells computer. Much much simpler, cheaper, and hey, HEI. I heartily recommend it.
post #5 of (permalink) Old 04-22-2003, 08:39 AM Thread Starter
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Re: Burning up ignition modules........

Rich,
That's good info. Hadn't heard that before. But makes perfect sense.
The last module lasted 6 months and I may have developed a short here recently. Hadn't changed anything under the hood but it is the original harness. I will check all of the wiring.
Do you have the part # for the Duraspark II module? Is it a plug in or will I need to splice?
Or would it be better to just step up to an MSD?
Sorry for all the questions.
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post #6 of (permalink) Old 04-22-2003, 09:23 AM
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Re: Burning up ignition modules........

1. IMHO, the MSD won't gain a whole lot over the TR TFI system (Don't tell TR),
2. It will give a more complete burn,
3. Due to the multiple sparking over the dwell cycle.
4. What's the voltage on the coil in the RUN position?
5. If you've got a full 12 volts...
6. That's the problem....
7. The resistance wiring is not in place,
8. To lower the working voltage to about 8.5 volts.
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post #7 of (permalink) Old 04-22-2003, 09:51 AM Thread Starter
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Re: Burning up ignition modules........

Interesting. I was looking at the TR diagrams on post TR Diagrams
and saw the wiring. Which wire is the resistance wire and how do I read the nomenclature to determine which gauge wire is to be used?
The reason I ask is because I did change some of that wiring out because it was showing it's age.
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post #8 of (permalink) Old 04-22-2003, 10:03 AM
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Re: Burning up ignition modules........

1. Dury, the coil voltage is stitched when the ignition key,
2. Is switched from ON to RUN.
3. The resistor wire is a THICK RED wire, about 48" long.
4. The Resistance is built into the wire.
5. It serves the same function as a ballast resistor.
6. Painless Wiring and other Aftermarket wiring do NOT contain the Resistance wire.
7. You need about a Resistance wire (AutoZone (Wells) p/n F799),
8. It will drop the voltage.
9. Also, make sure that the grounds:[*] Engine to frame,[*] Frame to Tub,[*] Fenders to Tub,[*] Battery to Engine,
are all there, and in good shape.
10. A compromised/floating ground can fry modules big time...
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post #9 of (permalink) Old 04-22-2003, 10:16 AM Thread Starter
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Re: Burning up ignition modules........

Thanks for the info. I'll check the wiring tonight. I imagine I have a couple of issues at work here.
What about the point Rich makes about the DuraSpark II module? Seems like cheap insurance.
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post #10 of (permalink) Old 04-22-2003, 10:47 AM
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Re: Burning up ignition modules........

I did the TeamRush upgrade, but used a Chrysler electronic ignition module instead of the Duraspark. Works well for me and, in my personal experience, the Chrysler ignition module is regarded more highly than the Duraspark.

Any others have thoughts on this?

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