Will crank but will not start

Tiny
WATKINT1
  • MEMBER
  • 1979 JEEP CJ5
  • 4.2L
  • 6 CYL
  • 4WD
  • MANUAL
  • 150,000 MILES
It has been in the garage for about six weeks while I replaced the top and rear axle seals and bearings. During this process I connected the battery in reverse. I replaced everything that looked bad. The Jeep will crank and acts like it wants to start but just will not run. I replaced the coil but that did not help. I can see fuel go into the carburetor when I work the throttle. Any ideas?
Tuesday, October 30th, 2018 AT 1:48 PM

5 Replies

Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
Run this test,

It will maybe clue me in on what you have done to your poor baby!

Jumper wire from the positive side of the battery to the positive side of the coil.

Click on my two pictures below

If it will run, the only way to kill it will be to disconnect the jumper. We have just bypassed the "on" position of the key.

What are your results?

The Medic
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Tuesday, October 30th, 2018 AT 5:49 PM
Tiny
WATKINT1
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Okay, so the Jeep runs when I connect it like you said. What do I need to do now?
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Wednesday, November 7th, 2018 AT 9:45 AM
Tiny
WATKINT1
  • MEMBER
  • 5 POSTS
I think I received a reply from you but I cannot open it. Also, I had the ignition module tested and it tests good.
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Wednesday, November 7th, 2018 AT 10:50 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
Great!

A couple of possibilities.

Let's weed an easy one out now.

Fire it back up.

While you are hearing that raw power being generated,

Take that jumper loose at the battery.

Does it run or shut off?

The Medic
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Wednesday, November 7th, 2018 AT 3:39 PM
Tiny
WATKINT1
  • MEMBER
  • 5 POSTS
It shuts off when I remove the wire.
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Wednesday, November 7th, 2018 AT 5:41 PM

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