HELP! How to tell if 4.2 Ignition control module is bad? - JeepForum.com
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Unread 01-02-2009, 07:59 PM   #1
yjcrawlr
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1990 YJ Wrangler 
 
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HELP! How to tell if 4.2 Ignition control module is bad?

My jeep ignition has been missing for a few days. Today I went and did the team rush mod, rebuilt the carb, and it still runs bad. Does anyone with the 4.2 have experience with the ignition control module going bad? How do I test it. What are the symptoms of a bad one. My jeep is nuttered and has ran great ever since the nutter until now. Help.

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90 YJ 102 in wb stretch, SOA, dana 60, 14 bolt welded,4.56s, 37in Parnelli jones dirt grips, currie twin stick dana 300, york oba, tractor link traction bar, full custom armor,poison spyder tube fenders, 95Cherokee High Output 4.0
2014 JKU, modified Rubicon Rails, RC stubby with warn 8000m, 2" leveling springs and OME trim spacers, Superchips Flashcal, Spidertrax wheel spacers, rubi shocks, and Lots more mods soon!!!
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Unread 01-02-2009, 10:42 PM   #2
timatoe
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I don't know how to test it. Shoot me a PM, you can have mine for the cost of shipping.

Typically when they go bad everything just dies like you shut off the key. Then you got to wait a bit and it may or may not fire back up.
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Unread 01-02-2009, 10:46 PM   #3
ayerightaye
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Ive heard tapping a wrench on it while running would give you an idea. Personally, when I thought mine was bad I bought another and swapped. Turns out it wasn't the problem but they are fairly cheap so now I have an extra. They can crap out without warning so having a spare can't hurt.
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Unread 01-02-2009, 11:10 PM   #4
Brandon_YJ
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I have a sneaking feeling my is going bad on me.
There have been about 3 days in the past year that my Jeep would just die with no warning, all electrical would still be going, it was like I just killed the ignition.
Been too lazy to check into it though.
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Unread 01-03-2009, 06:34 AM   #5
yjcrawlr
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That was the initial symptom going down the road and all power was lost like I shut off the key. It has been running like it has weak spark for a week or so now. All of the sudden it was fixed and ran fine, now it runs but begins to miss at higher rpms and runs like it has weak spark at idle. I am going to get the ignition control module tested this morning. Thanks guys.
Selby
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90 YJ 102 in wb stretch, SOA, dana 60, 14 bolt welded,4.56s, 37in Parnelli jones dirt grips, currie twin stick dana 300, york oba, tractor link traction bar, full custom armor,poison spyder tube fenders, 95Cherokee High Output 4.0
2014 JKU, modified Rubicon Rails, RC stubby with warn 8000m, 2" leveling springs and OME trim spacers, Superchips Flashcal, Spidertrax wheel spacers, rubi shocks, and Lots more mods soon!!!
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Unread 01-03-2009, 11:48 AM   #6
yjcrawlr
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Replaced the ignition control module this morning, not it! It starts after some work, won't rev over 3k and stumbles and stutters on the way there. Whats next? Distributor?
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90 YJ 102 in wb stretch, SOA, dana 60, 14 bolt welded,4.56s, 37in Parnelli jones dirt grips, currie twin stick dana 300, york oba, tractor link traction bar, full custom armor,poison spyder tube fenders, 95Cherokee High Output 4.0
2014 JKU, modified Rubicon Rails, RC stubby with warn 8000m, 2" leveling springs and OME trim spacers, Superchips Flashcal, Spidertrax wheel spacers, rubi shocks, and Lots more mods soon!!!
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Unread 01-03-2009, 12:01 PM   #7
yjsupporter
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Check the wiring from when u did the nutter...Loose connections?
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Unread 01-03-2009, 12:58 PM   #8
yjcrawlr
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checked that. Seems almost like a power issue. My starter is weak turning over. It is on the charger.
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90 YJ 102 in wb stretch, SOA, dana 60, 14 bolt welded,4.56s, 37in Parnelli jones dirt grips, currie twin stick dana 300, york oba, tractor link traction bar, full custom armor,poison spyder tube fenders, 95Cherokee High Output 4.0
2014 JKU, modified Rubicon Rails, RC stubby with warn 8000m, 2" leveling springs and OME trim spacers, Superchips Flashcal, Spidertrax wheel spacers, rubi shocks, and Lots more mods soon!!!
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Unread 01-03-2009, 02:46 PM   #9
timatoe
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I don't think the actual distributor would be bad, I guess it could happen, but I don't think it's real likely and all of your associated parts, cap, rotor, coil, etc. were just replaced with the Team Rush deal. Hmmm, not much left electrically.

I don't remember if there's a condenser under the stock cap, if so, replace it, it's a couple of bucks at most. I used to have a '70 Duster that had similar issues and that ended up being the culprit.
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