76 CJ7 Ignition Control Module - JeepForum.com
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post #1 of 8 Old 04-05-2020, 05:27 PM Thread Starter
Godawgs4498
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76 CJ7 Ignition Control Module

After reading through many other threads I’m still stumped on an issue. Decided to replace my ignition control module after noticing it was leaking white stuff out of it and having some performance issues. Jeep will run and idles fine on it but sporadically going down the road it will lose all power and I would have to “crank” it again.

So I tried a couple of Crown units and when I would go to crank it I couldn’t get it to fire. Saw they didn’t have great reviews so I got a BWD instead and same issue. I’ve relocated the ground but am still having the same woes. Weirdest thing is that I can still use the old module to crank it up and it idles fine. Anyone have any insight on this?

I’m open to an ignition upgrade but couldn’t find a good video for it either. The write ups I’ve seen are good but I’d trust myself more to see it done.

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post #2 of 8 Old 04-05-2020, 06:44 PM
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I haven't had this issue but it sure sounds like something is cooking. I've subscribed to the ignition upgrades using MSD products, although I've yet to replace the ignition box with that MSD 6A. Kinda short on pocket of late.

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post #3 of 8 Old 04-05-2020, 11:22 PM
CSP
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Swapping in a different ignition altogether is what I'd suggest. The Prestocrap ignition was bad with OEM modules and no surprise that Crown doesn't work at all.

I chose a factory GM HEI for mine. Worked well stand alone and ever better when it was incorporate into the fuel injection system to let it control spark timing.
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post #4 of 8 Old 04-06-2020, 01:38 PM
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Here you found the problem with the aftermarket replacement Prestolite ignition modules, they're all Chinese junk. I had the same problem with my 76, it would die driving and the replacement modules just would not work at all.



What I ended up doing was converting my ignition system to the Duraspark system used in (I think) 78 and newer CJs. Since it is a Motorcraft ignition system, I was able to find a module from an old Ford Econoline at the junkyard, and all the connectors to make the harness were available through Summit racing. Ever since I did the swap (about 15 years ago), I haven't had a single ignition issue.

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post #5 of 8 Old 04-08-2020, 05:30 PM Thread Starter
Godawgs4498
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Thanks all, I’ll take a look at some of the conversion write ups and scour YouTube to see if there’s one I think that can dumb it down enough for me haha.
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post #6 of 8 Old 04-12-2020, 10:22 PM
SC401
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So the best...in my opinion is an MSD 6 or similar CDI box. You can get them used for around 100 dollars, you cant fill these things so dont be scared. Then get rid of the oem ignition coil and get a Ford style e core ignition module. Lots of companies make them I have an older Mallory one that is nice. If you have the motor motorcraft dizzy keep it because it's fantastic. But go get a Ford adapt a cap and a large ford style distributor cap. They have the male terminals so you will need new wires but you want at least 8mm wires for this anyway. You will be highly impressed with reliability and throttle response. So if you shop around you will be put about 200 bucks maybe 250.
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post #7 of 8 Old 04-13-2020, 04:46 AM
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The Duraspark has a better rep than Prestolite ad was installed in millions of vehicles, its Achilles heel is that it draws amps when the engine is not turning but the ignition is on. That heat leads to damage.

The modules need to ground the primary windings in the coil to collapse the field and generate the spark, so all modules will get hot but the Duraspark is poor for this.

A better and cheap module is the GM HEI type. This has been used in millions of vehicles and is reliable but again needs a good heat sink. Jaguar called it an "ignition amplifier" and put it inside a very nice aluminium box and charge $150 for a new one, but it is just a $25 module in a nice box. The reason I mention it is that there is a Stealth HEI method, just hollow an old module box and wire and fasten an HEI module in, it will live quite happily in there.

The Prestolite distributor also has a habit of cracking its vacuum module. I suggest you discard and go for the Motorcraft style used 1979-1986. Get a 1979 to 1981 version, the advance head will allow more mechanical advance, otherwise you got to take it apart and flip the head over.

Almost limitless options for ignition from very simple and cheap eBay HEI clone distributors (not recommended) upwards.

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post #8 of 8 Old 04-14-2020, 10:36 AM
SC401
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Turbogus.. a less expensive option to the msd but still very good would the Echlin TP 44 by napa. It is a a very solid ignition module
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