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Old 07-20-2011, 08:42 PM
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Anyone have any Ideas?

Replaced the Pickup coil, coil and the ICM. When the the jeep gets warmed up, not running hot, I lose spark! What in the world! Tired of troubleshooting this one! Has to be electrical? Any help is appreciated in advance...........

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Old 07-20-2011, 09:28 PM   #2
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still sounds like module. that was what it was on mine. drove me nuts;

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Old 07-21-2011, 05:12 AM
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Module is brand new. As a matter of fact I bought 2 because of shipping cost, tried them both and the same result occurs.
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Old 07-21-2011, 07:29 AM   #4
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crank sensor ,its in the bell housing.when jeep is at temp check to see if there s continuity.
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Old 07-24-2011, 01:08 PM
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I don't have a crank sensor. Cranked the jeep yesterday and let it run for about 45 minutes until it croaked as usual. The coil was hot as a muttha Fo! Replaced some shotty wiring I found and tried it today. No spark. Put yet another ICM in it and it fired right up. I cant afford to go thru and ICM every week. That was the last one I had since I ordered them 2 at a time. Tired of messing with it. Not sure what to do next and neither does anyone else..........
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Old 07-24-2011, 03:37 PM   #6
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Sounds to me when your coil gets hot it is breaking down. Too much voltage to the coil could be what is causing this that voltage is controlled by the icm and there is usually a resistor somewhere between the icm and the coil. If you have a service manual you can look at the wiring diagrams and find it,
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Old 07-24-2011, 03:39 PM   #7
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What year jeep, what engine fuel inj, carb?
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Old 07-24-2011, 04:00 PM
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1989 with a new Weber carb 4.2L and PITA (Pain in the ###!) There is a resistor right by the coil and its hooked up. Is it serving its purpose, I dont know? Some thing about the size of a AA battery? The whole thing is like a bugger you cant get! I am being polite with my language!!!!!!!!!!!!!!!
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Old 07-24-2011, 04:01 PM
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The rum is going down good after 3 weeks of this S#it!
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Old 07-24-2011, 06:02 PM   #10
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The resistor could be your problem also it could be getting hot and opening up and cutting voltage to the coil. I'd try replacing it or if you have an ohm meter after the jeep shuts down check and see if you have continuity though the resistor if not replace last one I bought years ago was about 10.00. Your icm's may be good could be that by the time you change them the resistor has cooled down and made connection again.
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Old 07-24-2011, 07:39 PM   #11
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It's one of several things which should be easy to fix. First of all, the resistor as stated. You can check voltage at the coil as well. it should be 7.5(?) as I recall. It certainly shouldnt be 12 or close to it.

Second, what type of coil are you using? Stock? A lot of aftermarket coils (notably accel coils) dont have the proper amount of resistance and therefor toast your ICM quicker.

Third make sure your ground for the module is good. It grounds via the case to the fenderwell. Also, on the wiring harness side of the distributor plug add an aux ground to the black wire (dont cut the black wire, but splice an addition wire in with it) and run it to the negative battery terminal.

Try checking all three of those. I recently went through the same problem and converted my jeep to running a ford style duraspark module (same as the one we have, but actually ford branded and different plugs) and mounted it in a more easily accessible location. Then purchased a cheapo autozone module with lifetime warranty. It only burnt once during this 110*+ summer and it was <5 minutes and free to exchange for a new one.
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Old 07-27-2011, 03:05 PM
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I have done everything said here. Of course I had to put my last ICM that I have to get the jeep to crank. I ran it for just a few minutes but I am afraid of burning this one up before I can get a meter to check the voltage on the coil. Once I get ahold to one or either end up buying one (meter), I will post results. I did not find a risistor of any sorts on the hot wire from the ICM to the coil. So I guess I had better buy one and put it in because surely without it I am getting too much voltage..... Thanks
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Old 07-27-2011, 03:06 PM
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I even ran a ground wire from one of the nuts on the ICM to the engine block.
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Old 07-28-2011, 07:05 PM
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Alright, I put the meter on the coil just now. Voltage is jumping between 4.5 and 5.5V. Much lower than 8? Not sure why the voltage is so low or if this could be the problem? The wire from the ICM is connected to 3 other hot wires between it and the coil. Maybe the voltage is too low because the power is being drawn by other components?
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Old 07-29-2011, 09:31 PM   #15
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Alright, now lets move on. The way the coil works, you should have 6v (I checked and was incorrect in my original post) at the coil when running and 12v when cranking. Run it until it dies (put an old module in if needed) and once it dies, check the voltage at the coil.

What brand of ICM did you buy? Can you post pictures of the ICM, including the ground, the ditributor, and the coil for reference?
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Old 07-30-2011, 02:48 PM
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tslroper,

I did the nutter bypass this morning just knowing it couldn't hurt. Jeep fired right up as I thought it would. The ICM is just some aftermarket from morris 4x4. The coil is also some generic from Advance Auto which is about all I have to choose from living on an island. I let it run for over an hour and it kept on going. Took it for a short ride to the beach as well. Didn't really want to stray any further than I could tow it with my truck. The coil and the ICM are really hot. I guess they would get that way just being under the hood? Last time I checked the coil had 5-6.5 V to it. I took some pics but have no idea how to upload them from this site. It won't let me browse to upload them? Happy to email them to you. Problem may be solved for now? Not sure what else to do.

Thanks,
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Old 07-30-2011, 10:00 PM   #17
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You can upload them to photobucket. Then use the IMG tag and copy and paste it to a post on here.

It seems odd that the ECM would be causing your issues with cutting out, generally thats a problem with the ICM (generally meaning >90% of the time). Post some pics just so we have something to reference then keep driving it. If it doesnt cut out after a week, post back here to let us know all is good. If it does, let us know and we'll keep trying to help you.
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Old 08-01-2011, 03:29 PM
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Here they are. And yes I did use a red wire for a extra ground to the Dist.

Jeep Pics pictures by markymark1268 - Photobucket
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Old 08-02-2011, 06:52 PM   #19
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Your alternator could be shorting out. If that's not the problem, unfortunately you could have a faulty electronic control unit.
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Old 08-03-2011, 09:24 AM
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The ECM is totally out since the Nutter Bypass. Would the alternator shorting out fry the ICM?

Well I have yet to truly test the jeep on a long haul yet. Tropical Storm Emily has kept me from driving to work for the past 3 days and I have not left the house! Been watching it rain for 3 days.
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Old 08-03-2011, 02:57 PM   #21
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Quote:
Originally Posted by Retro4X4 View Post
The ECM is totally out since the Nutter Bypass. Would the alternator shorting out fry the ICM?

Well I have yet to truly test the jeep on a long haul yet. Tropical Storm Emily has kept me from driving to work for the past 3 days and I have not left the house! Been watching it rain for 3 days.
I really think you have a bad alternator at this point. If you have over 40,000 miles on it I would replace it. A bench test isn't necessarily going to show that type of problem. I don't like the numbers at the coil.
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Old 08-17-2011, 06:20 PM
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Just to keep everyone updated. Since the nutter bypass and a new coil, I have not had the first problem. The jeep is running good with no problems whatsoever! I think that the ECM had got wet too many times. There is a crack between the firewall and the hood and when it rains water ends up in my floorboard. Hence the wet ECM.

I really appreciate all of you pitching in with the advice. Thanks a bunch!!!!!!! Hopefully I won't need any help for a while!!!!!!!!

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