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Ignition Module questions for '78 CJ7 304.


 
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Huck Finn
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Joined: 22 Dec 2005

PostPosted: Fri Jan 06, 2006 1:21 pm    Post subject: Ignition Module questions for '78 CJ7 304. Reply with quote

Just wondering if anyone out there has experienced an ignition module failure (stock). I am curious to know whether it is something that fails completely, or intermittently acts up before it goes out -- and what are the symptoms. Any help is appreciated.
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hatchetjack
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Joined: 18 Jul 2005
Location: LA (Lower Alabama)

PostPosted: Mon Jan 09, 2006 4:14 pm    Post subject: module Reply with quote

It can do several things. I've seen them missfire (sometimes when hot, sometimes when cold), cut out intermittently, and just plain not run. I realize this is kinda over-simplified, but there are several failure modes with these modules.
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Huck Finn
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Joined: 22 Dec 2005

PostPosted: Tue Jan 10, 2006 3:05 pm    Post subject: Reply with quote

hatchetJack, thanks for the reply. One last Q. My mechanic friend used a specialized tester to determine if the ignition module was failing or the coil pick-up was failing. Is it possible, becuase the ignition module was working intermittently that the tester was incorrect when it gave a reading that the module was fine?
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hatchetjack
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Joined: 18 Jul 2005
Location: LA (Lower Alabama)

PostPosted: Thu Jan 19, 2006 2:50 pm    Post subject: Reply with quote

Boy, sorry for the delay!! Its always possible that the module was testing good intermittently. Sometimes they don't fail until they get hot, or some other needed condition is met. That's why if you can afford it, its good to put it on an analyzer like those made by Sun, or something similar. I did that with a van i was having problems with, it was $60 well spent to know what the problem was and not be guessing and throwing $$ at it.
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Bockwinkle
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Joined: 11 Aug 2005
Location: Parsippany, NJ

PostPosted: Sat Jan 21, 2006 7:13 am    Post subject: curse that metal box Reply with quote

I had 3 of those accursed metal boxes go bad in a 2 year period......Jeep would run great and then one day just refuse to start....would replace the module and it would run fine.....never found the reason why they kept failing.
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Bockwinkle
84 CJ-7
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tomthbomb
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Joined: 22 Mar 2006
Location: Deep East Texas

PostPosted: Wed Mar 22, 2006 6:31 pm    Post subject: Re: curse that metal box Reply with quote

Bockwinkle wrote:
I had 3 of those accursed metal boxes go bad in a 2 year period......Jeep would run great and then one day just refuse to start....would replace the module and it would run fine.....never found the reason why they kept failing.

I used to keep two mounted to the firewall so I could get home when one failed. Then I chunked them all and install a D.U.I. distributor. Man, what a difference!

http://www.performancedistributors.com/amcdui.htm

Tom
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