Lost spark

[Ifster]

Hi,
I just got done putting the engine back together after removing the manifolds to replace all the freeze plugs on the left side. I was able to start it before I began the work, but now I don't have spark.

I don't know much about it since I just got it. it's a 1981 CJ8, with the 4.2L. I was only able to run it very briefly because the freeze plugs all leaked. It has been parked since 2003. While initially trying to fire it up, I did noticed it had a very weak spark, but it was enough to start.

I also had the steering column off and the ignition switch removed. But I believe this is put back together properly.
I get 12v with key on to both coil terminals. The coil is good. It has an electronic ignition instead of points, (could be that), and it has what I believe an ignition control module on the pass side (pic). It has 9 wires and one connector. The replacement ones I've come across have 6 wires with 2 connectors.

Could the ignition module be the issue, is there a test for it? Or should I remove the electronic ignition and put in points as a test?

Thanks again.

33004065 Ignition module, fits 1976-86 Jeep CJ with Motorcraft ignition | Bernie's CJ Jeep Parts

www.cjjeepparts.com

 

[barrys]

81 would not have had points. Those ignition modules have a reputation for dying. And also doable replacements. The plug color is important if I remember correctly. They all look the same but a different color plug/seal where the wires come out of the module on a replacement is not good. Color matching is important(or I may be wrong, I think I am right though)

 

[Ifster]

Guess that's why I can't find replacement points.
What do I need to look for in replacement parts. I can not find a match for the module anywhere.
I think I found a replacement distributer. Or is it the distributer pick up that fails? (links)
What is a more reliable replacement, other than a DUI ignition and distributer?

Thanks

83506286 Distributor, fits 1978-1990 Jeep CJ, Wrangler with 4.2L Engine | Bernie's CJ Jeep Parts

www.cjjeepparts.com

J8128445 Distributor Stator Pick-Up, fits 1977-1990 Jeep CJ, Wrangler with 4.2L Engine | Bernie's CJ Jeep Parts

www.cjjeepparts.com

 

[John N]

9 times out of ten it’s the ignition module. That said, IMHO, the DUI is the best replacement. It replaces the distributor, ignition module and coil; cleaner and works better.

 

[Ifster]

I agree that DUI is the way to go, but I don't have the funds for that.
Think I'll need to call some of the CJ specialty venders and see if the 6 wire module will work for me. Different plugs, of course, but maybe able to connect the right wires.
Or does anyone know where I can find the 9 wire one? What are people doing for this same issue. Can't imagine everyone is switching to the DUI.

Thanks

 

[Ifster]

Well, this was probably not the best move since there's been no testing, but I found a distributor stator for $20 and bought it (it was the last one).
Everyone else had them for about $50.

I'll look into the module tomorrow.

 

[spankrjs]

What you pictured on your fenderwell is NOT the ignition control module. The pictured item is for CA emissions (and other version) 258 original Carter Carb Sol-Vac control module. 1983 and up use the big under dash computer to control the Sol-Vac, earlier pre big computer models use the thing you pictured. Nothing to do with ignition. It will extend the stem on the Sol Vac to increase idle rpm for certain load conditions, like AC compressor clutch engaging.

The ICM is on the bottom edge of driver side inner fender, under the coolant bottle.

 

[spankrjs]

I would not change the distributor pick up coil, they rarely go bad. Test the coil. The ICM can go bad, I don't really trust the parts store testers. Sometimes they have to get hot to malfunction.

As for a replacement, crap shoot. All parts stores versions are all made in China crap. At least they will give you a warranty. Buy two to keep a spare.

Look on eBay for NOS AMC/Jeep/Ford ICM. They weren't exactly the most reliable but better than the new crap.

Or hit up a junk yard and pull some ICMs off of Ford trucks, late 70's to late 80's. Check vans, trucks are almost always picked clean, vans are more of a PIA.

 

[Ifster]

What you pictured on your fenderwell is NOT the ignition control module. The pictured item is for CA emissions (and other version) 258 original Carter Carb Sol-Vac control module. 1983 and up use the big under dash computer to control the Sol-Vac, earlier pre big computer models use the thing you pictured. Nothing to do with ignition. It will extend the stem on the Sol Vac to increase idle rpm for certain load conditions, like AC compressor clutch engaging.

The ICM is on the bottom edge of driver side inner fender, under the coolant bottle

I can not fully express my feeling right now in anything but four letter words.
I have that disconnected right now, since I still don't have the right side fender on..........

 

[AJ2393]

I have an NAPA aftermarket ICM and factory distributor I just pulled from my CJ7, which was running. Upgraded to fuel injection and do not need anymore. Not sure if these parts would help you or not.

 

[Ifster]

I can not fully express my feeling right now in anything but four letter words.
I have that disconnected right now, since I still don't have the right side fender on..........

Hi, sent you a DM.
Thank you.

 

[Ifster]

Pugged in the ICM and it fired right up. And now on to 50 other things that still need to be addressed before the first drive.

Thank you all for the help.

 

[Ifster]

I have an NAPA aftermarket ICM and factory distributor I just pulled from my CJ7, which was running. Upgraded to fuel injection and do not need anymore. Not sure if these parts would help

Sorry about that. I quoted the wrong reply. Please check your messages.
Thanks again.