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Unread 07-29-2013, 06:27 PM   #1
1990yjoffroad
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Ignition coil yj

My 1990 wrangler 4.2L 6 cyl is having a problem with the ignition coil. Even when the car is off there is still power to the ignition coil. and when I start the jeep it wont shut off. I just replace the ignition switch in it. The only way to stop the power to it is to disconnect the battery. Any ideas of what it is.

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Unread 07-29-2013, 07:42 PM   #2
DaemonForce
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Starter solenoid is stuck?
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Unread 07-29-2013, 08:01 PM   #3
Siva283
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Do the gauges and everyrhing stay on like the key is still one?

Its not the starter selinoid causing this.

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Unread 07-30-2013, 01:46 AM   #4
jnicewan
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Check ASD relay in the relay box, try swapping it with another relay and see what happens.
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Unread 07-30-2013, 08:11 AM   #5
cruiser54
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Quote:
Originally Posted by jnicewan View Post
Check ASD relay in the relay box, try swapping it with another relay and see what happens.
It's carbureted. Also has that Motorcraft iginition box/module on it IIRC. Unplug it and see what happens.
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If you own a Renix Jeep, you'll want to check this out. >

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Unread 07-30-2013, 10:00 PM   #6
jnicewan
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Originally Posted by cruiser54 View Post
It's carbureted. Also has that Motorcraft iginition box/module on it IIRC. Unplug it and see what happens.
Dang, I dont see how I missed that, maybe it was getting late. Anyway OP measure the power you have at the coil and see what it reads. The ign module and starter relay can both give power to the coil. The starter relay would supply 12v-battery voltage, the ign module pwr to coil goes through a resister wire and should be somewhere around 6 volts.

So at least you should get an idea of where the short is coming from due to the measured voltage at the coil.
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Unread 07-30-2013, 10:10 PM   #7
cruiser54
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Also worth mentioning that those Ig Mods were notorious POSs and did really weird stuff.
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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Unread 08-01-2013, 10:10 PM   #8
jnicewan
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Originally Posted by cruiser54 View Post
Also worth mentioning that those Ig Mods were notorious POSs and did really weird stuff.
Yea, I had some weird problems out of those in the past, on my CJ and a couple ford products. When I still had the 4.2 in my 83 CJ, even with all new parts (coil,cap,rotor,plugs,wires and module) for the ford duraspark crap, I swapped in a GM HEI distributor and it really improved the way it ran, idle, response, power was all better with the HEI.
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Unread 08-01-2013, 10:34 PM   #9
cruiser54
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Quote:
Originally Posted by jnicewan View Post
Yea, I had some weird problems out of those in the past, on my CJ and a couple ford products. When I still had the 4.2 in my 83 CJ, even with all new parts (coil,cap,rotor,plugs,wires and module) for the ford duraspark crap, I swapped in a GM HEI distributor and it really improved the way it ran, idle, response, power was all better with the HEI.
You bet.
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Quote:
Originally Posted by chris87xj View Post
If you own a Renix Jeep, you'll want to check this out. >

An index to over 25 write-ups can be found in Post #1.

Cruiser's Mostly Renix Tips
My Jeep Technical Photos

http://www.cherokeeforum.com/g/album/1725214
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