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Cranks but no start?

Tiny
WHITEWULLFF
  • MEMBER
  • 1976 JEEP CJ7
  • 0.5L
  • V8
  • 4WD
  • MANUAL
  • 120,000 MILES
I’m hoping to hear from CJ medevac. Tried jeep forum but all out of ideas and almost out of time. I fixed it up for my daughter's 16th coming up. It smoked and smelled of fuel. So, I replaced the head gaskets, the valve seals, the valley pan (4 times). Motorcraft 2 barrel is getting fuel, no spark at the plugs or the GM points distributor. Coil numbers post to post 1.8 and secondary 11.7. New points, and condenser. I’m out of ideas and really need your expertise.
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Monday, July 18th, 2022 AT 2:27 PM

25 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Hi Lance,

Sorry we have not seen CJ in a while, but I can help, with the ignition key on do you have power at the positive side of the coil? Here is a guide that can help:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Check out the diagrams (below). Please let us know what happens.
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Tuesday, July 19th, 2022 AT 9:25 AM
Tiny
WHITEWULLFF
  • MEMBER
  • 51 POSTS
Yes. I’ve tested the coil primary and secondary cranking and non-crank. 1.8 ohms and secondary is 12.3 on 20k ohms.
I then took test light to coil and cranked it the light flashes in revolution with the motor cranking.
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Wednesday, July 20th, 2022 AT 10:41 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
That is a good sign. Now remove the coil wire and check for spark, this video will show you how:

https://youtu.be/baq_aEWNQ0Y

If you have spark check it at the spark plug, if no spark is present replace the ignition rotor and cap.
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Thursday, July 21st, 2022 AT 10:40 AM
Tiny
WHITEWULLFF
  • MEMBER
  • 51 POSTS
Ignition rotor, cap, points, condenser has already been replaced.
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Thursday, July 21st, 2022 AT 12:45 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Does it have spark?
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Friday, July 22nd, 2022 AT 2:06 PM
Tiny
WHITEWULLFF
  • MEMBER
  • 51 POSTS
No, not at the plugs.
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Saturday, July 23rd, 2022 AT 4:28 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Does it have spark from the coil? If not replace the coil. If so the spark is getting lost inside the distributor which would say ignition rotor.
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Sunday, July 24th, 2022 AT 11:51 AM
Tiny
WHITEWULLFF
  • MEMBER
  • 51 POSTS
Okay, thank you. I’ll will go back through the process.
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Sunday, July 24th, 2022 AT 12:56 PM
Tiny
WHITEWULLFF
  • MEMBER
  • 51 POSTS
Okay, so, I put a spark plug in the end of the wire coming from coil. How do I test the distributor? I put new points and cap on there which it probably didn’t need but anyways I was just adjusting the points one more time and when my alan wrench touched the points and another part of distributor, it arcs like makes a spark. Is that normal? I believe my key was still in the start position.
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Sunday, July 24th, 2022 AT 5:18 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Yes, because you are near the 12 volt ignition supply. Did the spark plug spark? To test the distributor, you would do the same thing but at each plug. Let me know.
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Monday, July 25th, 2022 AT 12:40 PM
Tiny
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  • MEMBER
  • 51 POSTS
No spark from the plugs. Changed out cap and rotor same thing.
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Tuesday, July 26th, 2022 AT 12:04 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
So, spark from the coil but not coming out the distributor? It must be bad plug wires; can you remove the wires from the cap to see if there is spark at the plug wire terminal?
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Wednesday, July 27th, 2022 AT 12:11 PM
Tiny
WHITEWULLFF
  • MEMBER
  • 51 POSTS
No spark from the end of wires.
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Thursday, July 28th, 2022 AT 5:59 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
So, you are losing it between the coil and the plug wires. Can you look under the cap to see if something is shorting it out?
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Friday, July 29th, 2022 AT 1:37 PM
Tiny
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  • MEMBER
  • 51 POSTS
Okay will do. I’ll get back to you tonight. Thanks for your help.
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Friday, July 29th, 2022 AT 6:27 PM
Tiny
WHITEWULLFF
  • MEMBER
  • 51 POSTS
Okay, removed cap turned key on and cranked motor with remote starter no short or sparks inside distributor.
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Friday, July 29th, 2022 AT 9:31 PM
Tiny
WHITEWULLFF
  • MEMBER
  • 51 POSTS
Okay, I readjusted the points it will fire right up but dies right away unless I’m feeding it gas from the carb. It sounds really rough like it’s gargling and motor shakes. I can see fuel squirting from the jets into carb. I adjusted the idle gas screws out more but still won’t idle.
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Sunday, July 31st, 2022 AT 7:02 PM
Tiny
WHITEWULLFF
  • MEMBER
  • 51 POSTS
Hello. I’m not sure what’s going on either my acct or phone but I received notification that I got a response on my jeep not running however when I open it up there’s is nothing. Can you possibly send me your response again thank you. Where my cj7 stands now is got it started but it will not stay running.
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Monday, August 1st, 2022 AT 7:44 PM
Tiny
WHITEWULLFF
  • MEMBER
  • 51 POSTS
Oh, wow there you are hope I’m not too late. No, it shuts off immediately. I’m using a remote starter so working the gas from the carb, but as soon as I stop so does the motor.
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Wednesday, August 3rd, 2022 AT 10:42 AM

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