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Unread 02-12-2013, 07:32 AM   #1
Renegad87
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1987 YJ Wrangler 
 
Join Date: Apr 2012
Location: Topton, PA
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Another Ignition Module Failure Thread

First off I've read almost every post I came across on this topic and haven't seen anyone with my experience so I'm starting a new thread.

4.2L
Nuttered
Weber
JuiceBox Ignition Upgrade

I burned up my first ignition module yesterday while "rescuing" my girlfriend's car from the woods she drove through. Icy roads and sharp turns don't mix.

All the upgrades listed above have been running for over 2 years with no complaints.

Jeep died while I was away from it and sat with ignition ON for a few minutes before I got back to it. Came back and it wouldn't start. I tried cranking for a few, but didn't get anywhere and then smelled the fatal electrical fire smell I'm sure we are all familiar with.

Opened the hood and let the wonderful smoke roll out. Ignition module was still cooking even with the key off. I had to disconnect the battery for it to stop.

So I replaced the module and it's been running fine. My question is did this just happen to fail that day or is something else wrong?

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Unread 02-12-2013, 07:46 AM   #2
Que89YJ
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Join Date: Apr 2008
Location: Detroit, Michigan
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Try this:

http://www.squidoo.com/jeep-tfi-team-rush-upgrade

Avoid Burning Up Your Coil With A Ballast Resistor
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Unread 02-12-2013, 10:07 AM   #3
Old4X
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If the ignition is left on (not running) with these ignition systems, they will burn up in less than a minute. Even a new module.
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Unread 02-12-2013, 06:15 PM   #4
Renegad87
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Old4x
I was wondering about that. I had always been told that leaving the ignition on without the engine is running was bad, but I never really understood it. So for now unless it happens again I will write this off as leaving the ignition on burned up my ignition module.

Que89yj
Excellent site I definitely bookmarked it. If I every have a coil problem I'll look into adding a resister and come to think of it I may run out this weekend and check the voltage at my coil.
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Unread 02-12-2013, 08:49 PM   #5
Old4X
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Are you using a Duraspark style module?
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Unread 02-13-2013, 12:56 PM   #6
Renegad87
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I'm using one of these. I bought it at NAPA. I think it was labeled TP-40
ignition-module.jpg  
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Unread 02-13-2013, 02:53 PM   #7
yellow2kgt
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Another thing to check, are you still using the factory resistance wire to power the coil? Running a full 12 volts to it could also end in premature icm failure.
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Howell EFI, BDS 3.5" lift, M.O.R.E 5/8" Boomerang shackles, 1" Daystar BL, 1" JKS MML, TFI, Crager soft 8s w 35" Dunlop Mud Rovers, Ford 8.8, 4.88s, Dana 30 E-Locker, Terra Flex SYE, Tom Woods CV shaft, Warn M8000.
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Unread 02-13-2013, 03:29 PM   #8
Old4X
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That is the duraspark style. Remember to turn ignition off when not running the engine. No radio playing when parked except in accessory position.

You can do the GM ICM mod if you keep having problems. Those ICMs are much better than the duraspark, and are internally regulated, they do not run an external resistor, that means hotter spark at idle. Only $25, most with a lifetime guarantee.
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Unread 02-13-2013, 06:22 PM   #9
Renegad87
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Old4x
Excellent thanks for the info. If this one burns up within the next year I'll go with a GM ICM mode. I already started looking at it. Jeep is getting rewired this summer so I may add it to the list.

Yellow2kgt
I performed the nutter bypass and ran new wire from the ignition module to the coil so I'm going to guess and say that I am not using the resistance wire originally used. I'll have to pull out the diagrams and figure out which one that is. I hate all these "fusible links" and "Resistance wires" this summer they are all getting replaced with modern components. Checking the coil voltage is at the top of my list once the snow stops falling.
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