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Unread 06-10-2011, 04:18 PM   #1
dieselnp
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1981 CJ7 
 
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Mexican CJ7 drama

I bought my 81 CJ7 in 2005 and have not had a problem. This year my engine went through a rebuild and I found out that it was bored out .040 over and it didn't register that my CJ7 was made in mexico until my Ignition control module went bad. These two differences are the only thing different than the american counterpart. The module that they kept trying to give me has two round clips with 5 wires, mine has one-9point flat clip with 9 wires. I have been to every parts store, contacted manufactures, chrysler, jeep, and they all tell me "Good luck, I can't tell you where to get this part."

The symptoms before the system failed was the coil was making a light popping noise and the motor would misfire along with the popping. I replaced the coil, cap and rotor, new plugs and wires, and vacuum lines, but the noise continued. Before, I could drive it but it would struggle under acceleration, now it won't even start...

If anyone can help me diagnose my isssue, if it is or isn't my control module, maybe its my distributer itself... HELP!!

I'll post a picture of the meximodule to see if anyone can identify it.

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Unread 06-10-2011, 04:26 PM   #2
Erik719
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Get an MSD ignition and scrap the stock one. It will cost you some $$ but you will get a performance boost as well.
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Unread 06-10-2011, 05:32 PM   #3
BioTex
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Isn't the later model (as in YJ's) Ignition modules coming with the flat plugs? Seems I remember seeing one, but could be wrong.
Any YJ guys confirm this?
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Unread 06-10-2011, 05:35 PM   #4
81c-j5
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sounds like trouble.....good luck!!!
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Unread 06-10-2011, 05:52 PM   #5
CJ7-Tim
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How did you determine your CJ was made in Mexico ? Do you mean it was made in Toledo for export to Mexico ?

Do you have any picturess of this module and its location ? Does it have a part number on it ?
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Unread 06-10-2011, 06:49 PM   #6
JeepnBlake
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I want to see this mexican CJ as well. Some of the mexican jeeps got 4.6L I6's from the factory, unfortunately like so many other great things these were for export only.
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Unread 06-10-2011, 07:31 PM   #7
brownbagg
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your vin should tell you where its made
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Unread 06-10-2011, 07:40 PM   #8
superj
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tell me where to look and i'll check my yj to see. i have a 4.2 also
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Unread 06-10-2011, 07:44 PM   #9
illinicj
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Just wire it up with a HEI module. (No, not distributor - just the module.) They are cheap and plentiful. I don't have a link, but google "HEI stealth" and you'll find a write up where somebody put the HEI module in the duraspark box. I've been running it with the team rush upgrade for years.
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Unread 06-10-2011, 08:13 PM   #10
BioTex
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Quote:
Originally Posted by superj View Post
tell me where to look and i'll check my yj to see. i have a 4.2 also
I'm thinking it's the 90 up year models. The plug that hooks up the ignition module. Drivers side inner fender down low.
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'85 CJ7, BDS 4" lift, 1" Body lift, 33x12.5, Shrockworks Sliders, 304 V8 with RV cam., T-176, D300, Dana 30, AMC 20.
1986 CJ10-A SD-33 Diesel/727/np208
1971 800B with 345/T-19
06' TJ Rubicon, 4" R.C. springs, BFG/AT 35s M.C. 6" fenders, rockers and surrounds, Currie front & rear adj. tracbars, tattons DC rear shaft, adj. upper - lower CA's. Bilstein 5100's
YJ Buggy Build Current project. Stroker/FI ?
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Unread 06-10-2011, 08:23 PM   #11
gosupes
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Quote:
Originally Posted by illinicj View Post
Just wire it up with a HEI module. (No, not distributor - just the module.) They are cheap and plentiful. I don't have a link, but google "HEI stealth" and you'll find a write up where somebody put the HEI module in the duraspark box. I've been running it with the team rush upgrade for years.
Best money you will ever spend. I carry an extra HEI module, never had to use it yet.
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It's just a Jeep, and if you don't wheel it once in a while, it's not even that.
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Unread 06-10-2011, 10:50 PM   #12
dieselnp
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The unfortunate thing with the HEI solution is it's only 5 wires, I'm left with 4 extra wires. The Meximodule has 9 wires coming out and runs into the harness. That leaves me with only 3 solutions, Go HEI and rewire the whole thing, go MSD and rewire the whole thing, or does anybody wanna go to Tijuana for me?

This came with the 4.6 and i'm still working on unlocking the potential of this engine. I'll have pics when I get the premium package and they'll allow me more photo room.
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Unread 06-11-2011, 12:04 AM   #13
Pacfanweb
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What's there to rewire with an HEI? It needs one 12v wire. Do away with the rest, or let 'em hang.
(I'm talking about an HEI distributor, not just the module)
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Unread 08-10-2013, 12:46 PM   #14
rokjunki
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here is my 1985 jeep with a Mexican 4.6 liter
jeep2.jpg

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Unread 08-10-2013, 12:47 PM   #15
rokjunki
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I went to put a valve cover gasket on and it was different than a 4.2
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