CJ 4.2L Starting problem - Page 2 - JeepForum.com

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post #16 of 26 Old 07-06-2010, 06:13 PM
Ken4444
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Quote:
Originally Posted by VACJ7 View Post
It is only there to eliminate noise in your radio from the ignition.
Ditto that. I went through the same question. My capacitor crapped out (the wire broke off) and I haven't gone back to replace it yet because I haven't had time to install a radio.


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post #17 of 26 Old 07-06-2010, 06:29 PM
crzdmnky
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Flux core capacitor?
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post #18 of 26 Old 07-06-2010, 06:32 PM
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Flux core capacitor?
Yeah, that's it. It broke off when I was changing the brake light fluid.

"I give you a republic, if you can keep it." - Benjamin Franklin
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post #19 of 26 Old 07-06-2010, 06:37 PM
crzdmnky
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Man, It doesnt beat having to replace muffler bearings on this CJ. Them things are tough to get to, and on top of that there is a special hard to get tool you have to rent from Autozone to take it out. Major Suckage.
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post #20 of 26 Old 07-07-2010, 11:22 PM Thread Starter
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so is a nutter an option to fix a no spark problem??
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post #21 of 26 Old 07-08-2010, 04:43 AM
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It's an option IF your ECM is causing the problem. Doing the Nutter Bypass simply removes the ECM from the ignition loop. From that point on everything ignition related will be controlled manually.

Again, I suggest you find what is causing the no fire situation before making yet another change.

No matter where you go, there you are.
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post #22 of 26 Old 07-08-2010, 06:02 AM
Ken4444
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Originally Posted by tigercreek View Post
It's an option IF your ECM is causing the problem. Doing the Nutter Bypass simply removes the ECM from the ignition loop. From that point on everything ignition related will be controlled manually.

Again, I suggest you find what is causing the no fire situation before making yet another change.
Agreed. You might take the time to read the following post. It detals the troubleshooting steps I went through to narrow down my problem with the help of JeepHammer. It will help you troubleshoot a number of areas that could cause your problem:

http://www.jeepforum.com/forum/f8/25...spark-1045702/

You could perform the Nutter Bypass first, but be aware that to perform the complete procedure you'll need a timing light and you'll be working on the carburetor's stepper motor, so it's not as easy as just running a couple of wires.

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post #23 of 26 Old 07-08-2010, 09:22 AM Thread Starter
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thanks for the thread...I'll follow it through and let you know of the results...
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post #24 of 26 Old 07-19-2010, 07:17 PM Thread Starter
planb722
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still no spark...

I followed the thread...tested the pick-up (at 450 ohms)...I added a ground wire as recommended to the module...I tested the red wire at the coil, it shows dim with ignition on and gets brighter when cranked...I tested the green wire, it had a solid light even when cranking...assumed(I know) module was still bad, replaced it and had same results...

What next????
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post #25 of 26 Old 07-19-2010, 08:16 PM
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You could try the wiring portion of the Nutter Bypass to bypass the ECM. That would eliminate one big potential variable. If that fixes it, then you either get a new ECM and back out the wiring changes. Or continue with the other steps in the Nutter (adjust timing, set carb metering pins, etc)

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post #26 of 26 Old 07-22-2010, 07:52 AM Thread Starter
planb722
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I did the wiring portion of the nutter and now have spark at the coil and plugs but it still wouldn't start. Is that because I need to finish the rest of the bypass (metering pins and hoses)? How much more wiring can I eliminate now with the bypass?
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4.2 , coil , ignition module , ignition problem , start problems

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