CJ MEDEVAC help me with my CJ 7!

Tiny
DAVY KEITH
  • MEMBER
  • 1978 JEEP CJ7
  • 5.0L
  • V8
  • 4WD
  • MANUAL
  • 1,234 MILES
CJ, I see you have a wealth of knowledge and answers on here. First of all, thank you for your service.

I have owned at least a dozen jeeps. I recently bought a 1978 CJ7 with an AMC 304 motor. The previous owner(s) have tweaked the motor, it has a cam. When I first drove it, it sputtered and drove terribly. First mechanic I took it to stated coil was hooked up backwards and they put new coil in and removed, yes removed the resistor! Ran crappy.

Took it to the next mechanic and he discovered no resistor problem and put one inline to the positive side of the coil. I see you mentioned that in another thread that is no go. It ran like crap. Mechanic said couldn't fix it some thing is wrong with the engine.

Third mechanic I took it to, said the problem was that the carb was full of crap! Ran great! Until Thanksgiving day! Turned over and it started briefly. I continued to turn it over, several loud super loud backfires (it has cherry bomb mufflers) no crankie. Spark was weak. The next day, I decided to check the coil. Ohm resistance was out of spec so I bought another one and change the coil myself (got one from Autozone specifically for this make and model). There is nothing on the package that says for use with or without a resistor. It's "Hecho in Mehico" duralast. However, in my diagnostic I did check it again.

Okay I am taking a breath and going to let you read this before I get too far into this.
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Monday, November 28th, 2016 AT 5:48 PM

40 Replies

Tiny
DAVY KEITH
  • MEMBER
Put that on and still no spark. Well, Ignition control box was only $3.000 at Autozone so what the heck. Changed that too, no sparkie. What I have found that seems to be outside of the diagnostic specs on the coil is that with the key on I have twelve volts to both positive and negative side of the coil! I was thinking it should only have 12+ to one side, the positive side? I have been testing with a test light and a volt meter. One diagnostic test indicated I should check the negative side with the lead of the light to the positive side of the battery and that should light up. Well it doesn't. So I am sure you may have some questions for me thanks a million for your service to our country and your time!
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Monday, November 28th, 2016 AT 5:51 PM
Tiny
DAVY KEITH
  • MEMBER
The Ignition Control Module is Duralast F102 http://www.autozone.com/ignition-tune-up-and-routine-maintenance/ignition-control-module/duralast-ignition-control-module/118422_986171_0_5133/
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Monday, November 28th, 2016 AT 5:58 PM
Tiny
DAVY KEITH
  • MEMBER
I can go outside and measure the resistance in my positive wire to my coil if you need that information.
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Monday, November 28th, 2016 AT 5:58 PM
Tiny
DAVY KEITH
  • MEMBER
Oh and by the way I can figure things out, I am a pretty smart fellow the reason I was using mechanics is I just do not have a lot of time. However, now that I am in this neck deep I am having to make time and it is a situation where I am going to figure this out come hell or high water!
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Monday, November 28th, 2016 AT 5:59 PM
Tiny
DAVY KEITH
  • MEMBER
Oh and I thought about taking the Ignition module back to Autozone to have them test it to make sure it is not bad but I had to cut the plug off because my Jeep is a Frankenstein Jeep. I am very proficient at splicing, worked for my dad at his electronic's business for the first twenty years of my life. Anyway, they could not test it because I cut the plug off, sheesh.
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Monday, November 28th, 2016 AT 6:02 PM
Tiny
DAVY KEITH
  • MEMBER
Also, I checked the ohms on my pick up in my distributor, that looked okay, but I will do it again if needed!
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Monday, November 28th, 2016 AT 6:03 PM
Tiny
DAVY KEITH
  • MEMBER
Started to buy a new distributor but I figured instead of throwing parts at it I really need some expert advise. http://www.autozone.com/external-engine/distributor/cardone-reman-distributor/jeep/cj5/1979/6-cylinders-c-4-2l-2bl-ohv/768895_76774_0/?counter=0filterByKeyWord=DISTRIBUTORfromString=search
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Monday, November 28th, 2016 AT 6:04 PM
Tiny
DAVY KEITH
  • MEMBER
Oh and to advise you how I am testing for a spark. I pulled a plug with the wire on it. I ground out side of plug, no spark. I actually took a wire and completely wrapped it around the plug and ran the other side to the negative on the battery. No spark while trying to crank it. Starter works fine, motor turns over it cannot start without a spark! I do not know much but I do know that!
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Monday, November 28th, 2016 AT 6:06 PM
Tiny
DAVY KEITH
  • MEMBER
Picture sorry it is sideways.
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Monday, November 28th, 2016 AT 6:18 PM
Tiny
DAVY KEITH
  • MEMBER
My awesome resistor in line going to positive lead on coil. Have no clue what resistor it is.
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Monday, November 28th, 2016 AT 6:24 PM
Tiny
DAVY KEITH
  • MEMBER
Ignition control from Autozone F102 Hecho in Mexico. I know it is not bolted down and it needs to be for heat distribution and maybe grounding too I just slapped it back on after my failed attempt to get Autozone to check it to see if it is bad. This is the new one I recently bought.
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Monday, November 28th, 2016 AT 6:26 PM
Tiny
DAVY KEITH
  • MEMBER
Picture of motor. Edelbrock carburetor mostly new.
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Monday, November 28th, 2016 AT 6:27 PM
Tiny
DAVY KEITH
  • MEMBER
My illustrious distributor looks mostly new probably is I do not have the history on it. Inside is pretty everything looks brand new on the inside. Plug wires are newish, checked resistance on a couple, especially the one going from coil to distributor and it checked okay.
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Monday, November 28th, 2016 AT 6:28 PM
Tiny
DAVY KEITH
  • MEMBER
Picture of her from the side, she is pretty but has a few rotten teeth underneath. Someone spent more time on the outside than all the rust down below.
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Monday, November 28th, 2016 AT 6:30 PM
Tiny
DAVY KEITH
  • MEMBER
Better picture of motor.
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Monday, November 28th, 2016 AT 6:31 PM
Tiny
DAVY KEITH
  • MEMBER
My daughter in the Jeep. She wont ride it yet says it scares her. Not going to let her until I get seat belts, yeah really whomever had this had zero seat belts. Probably needs a new steering box as it is a constant back and forth on the steering wheel and I would like to either lower it or maybe get spacers to have it sit wider on the road? I need to make it a little safer as it concerns me sitting up so high, easy roll over.
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Monday, November 28th, 2016 AT 6:34 PM
Tiny
CJ MEDEVAC
  • EXPERT
Do you have an OEM distributor or has it been changed?

Have you looked at the fuses?

Do you know how to run a continuity test w/ your voltmeter (like thru a light bulb)?(I can show you if need be)

1976-1978 used "Prestolite Ignition", Is this what you still have?

Prestolite did not use a resistor wire or a ballast resistor- the OEM coil (or aftermarket the same) will be the correct coil.

Where are you buying parts? I can look at what you are getting/ or need on their site

I really need to know what is modified and not stock on your engine.

Please try to answer all of my questions, sorta makes things go smoother and faster!

The Medic
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Monday, November 28th, 2016 AT 6:36 PM
Tiny
CJ MEDEVAC
  • EXPERT
Please slow down!

Let me catch up!

The Medic
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Monday, November 28th, 2016 AT 6:40 PM
Tiny
DAVY KEITH
  • MEMBER
Lol. I have more! Just been waiting for you so I thought I would keep posting.
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Monday, November 28th, 2016 AT 7:02 PM

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