Need quick advice on my Prestolite replacement options... - JeepForum.com
 
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post #1 of 8 Old 12-22-2013, 03:14 PM Thread Starter
johny1i
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Need quick advice on my Prestolite replacement options...

This is for my '77 CJ-7 with the 258 I-6. The vacuum advance has crapped out on my Prestolite distributor and I need to do a quick/cheap, 2-days-before-Christmas distributor fix to get it back up to highway speed quickly. Of the billions of threads i have read on HEI-vs-Team Rush-vs-every conceivable module, it comes down to this---I don't want to bite off the whole Team Rush/MSD module process at this moment, but I don't want to buy stuff that I'll just throw away in a few weeks when I have the time to do it. If I buy a Motorcraft-Duraspark distributor for a 1979 CJ-7 (258 I-6) and a gasket,can I just reuse a stock ignition module for an 80's CJ that I happen to have laying around? Can the plug wires and coil from my '77 also be reused?

Thanks.... lots of great upgrade options on here, but with family coming into town and all my cash spent on Christmas gifts, I just need to get it back on the road at the moment.


Currently an '86 CJ-7 and a '77 CJ-7 Golden Eagle---#4 and 5 following a '01 Sahara, '90 Sahara, and '85 CJ-7....
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post #2 of 8 Old 12-22-2013, 03:59 PM
CSP
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Quote:
Originally Posted by johny1i View Post
If I buy a Motorcraft-Duraspark distributor for a 1979 CJ-7 (258 I-6) and a gasket,can I just reuse a stock ignition module for an 80's CJ that I happen to have laying around? Can the plug wires and coil from my '77 also be reused?
Yes and yes.
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post #3 of 8 Old 12-22-2013, 04:35 PM Thread Starter
johny1i
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Thanks, man!!

Currently an '86 CJ-7 and a '77 CJ-7 Golden Eagle---#4 and 5 following a '01 Sahara, '90 Sahara, and '85 CJ-7....
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post #4 of 8 Old 12-22-2013, 05:24 PM
hp_lovecraft
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A little issue is the Prestolite system only uses one wire from the ignition, while the motocraft uses 2, plus the resistor. You will need to add that in.
Plus, you will find the Prestolite module used 4 wires, while the motorcraft uses 6, with different style plugs.

I had the same problem years ago, and through in a cheap Ebay HEI as a quick-fix, until I could assemble the parts for something better. Well, then that never happened!
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post #5 of 8 Old 12-23-2013, 07:51 AM
John Strenk
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Ever think about buying a cheap HEI distributor until you have time and $ to do it right?
One wire and you are done.

Or is this something you are trying to quickly piece together from the local parts store.
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post #6 of 8 Old 12-23-2013, 03:12 PM
james04si
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A motorcraft distributor and a heI module will get you up and running without a resistor like the motorcraft ICM. Simple and easy to swap from a prestolite. Just search on here for jeephammers stealth hei module diagram. You can do the big cap and rotor upgrade but that will require new spark plug wires. Also you can change over to a ford e-core coil for a little more spark power.
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post #7 of 8 Old 01-06-2014, 08:28 PM Thread Starter
johny1i
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Just for the sake of anyone who comes across this thread, I wound up going with an upgraded (brass contact) Motorcraft distributor/cap, a stock module, and a set of 8mm plug wires (all stock for an '85 CJ-7), and did add the resistor since the original Prestolite system harness didn't have one.

The one hiccup I encountered is that the existing starter solenoid didn't have both the "I" and "S" studs (I was following Jeephammer's wiring diagram) so I added a new one (also for an '85 model) at $22. Everything works flawlessly, so thanks guys....

Currently an '86 CJ-7 and a '77 CJ-7 Golden Eagle---#4 and 5 following a '01 Sahara, '90 Sahara, and '85 CJ-7....
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post #8 of 8 Old 01-06-2014, 08:30 PM Thread Starter
johny1i
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Oops, should have added that I upgraded to the big '82 Ford cap/adapter/rotor while I was in there... Total cost about $130-140.

Currently an '86 CJ-7 and a '77 CJ-7 Golden Eagle---#4 and 5 following a '01 Sahara, '90 Sahara, and '85 CJ-7....
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