Chevy HEI problem in CJ-7

[imhogwild0304]

Hello, I have a 355 chevy in my cj-7 with the hei ignition. The problem I am having is that after it runs for about 20 minutes and gets hot, the ignition cuts out, and then I completely lose spark. The whole ignition system is new. After I let it cool down for a couple hours, it fires right up. I am at a loss as to what to do about it. Has anyone else ever experienced this. I would sure like to hear any suggestions. Thanks

 

[SenorCole86]

I think this happened to another guy on this forum. I remember us all thinking long and hard about it. If I remember correctly, he ended up finding a small crack in his distributor which opened up when the engine heated up. How this caused complete ignition failure I'm a little unsure of, but I think that was the problem . . . but I may be wrong. Let's see what these other guys have got to say. Hope you figure it out, have a good one.

 

[imhogwild0304]

ok thanks for replying I will check it out. Also I should mention, it did the same thing with the original distributer also. The new one was ok for about 400 miles, then the same problem again. Thanks

 

[LVRockCrawler]

i'm not that familiar with the HEI but isn't there a control module? my 89 did the same thing and thats what the culprit was - like i said - no real clue how the hei works but thought i'd try... g'luck and welcome to Jeepz!

 

[SenorCole86]

They do, and it's wrapped around the distributor, inside of the cap. If you go to the autoparts store and ask for parts for a 1980 Blazer or something, they can give you new parts for it.