Turns over, no spark

Tiny
CJ5 1977
  • MEMBER
  • 1977 JEEP CJ5
  • 5.0L
  • V8
  • 4WD
  • MANUAL
  • 200,000 MILES
Engine was running rough, so changed plugs, plug wires, coil, distributor cap and rotor, points and condenser. Now no spark, will only turn over, will not start. What’s wrong?
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Tuesday, June 11th, 2019 AT 6:13 PM

3 Replies

Tiny
CJ MEDEVAC
  • EXPERT
Are you sure this has points?

It is not electronic ignition with "prestolite ignition"?

If this does have points, are you confident in installing them correctly?

Send a picture of the points installation.

What brand, part number is your coil? Where did it come from?

With the key "on", what is the DC voltage at the positive side of the coil?

The Medic
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Tuesday, June 11th, 2019 AT 6:44 PM
Tiny
CJ5 1977
  • MEMBER
-Yes- it has points.
-Not sure I understand your ignition question.
-points are installed correctly- not sure if the gap- could use advice on this.
-Coil is Duralast.
Duralast Ignition Coil.
Part Number: C819.
-DC voltage was 12 volts at positive side of coil.
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Tuesday, June 11th, 2019 AT 7:29 PM
Tiny
CJ MEDEVAC
  • EXPERT
What is the gap you have now?

Key off and out of the switch.

Turn the engine with a wrench (pic 1) until a high spot on the distributor shaft raises the points (opens the points). Stick the correct feeler gauge in the opening. Adjust the adjuster until your feeler gauge slides snuggly between the anvils (not too tight/ not too loose?

Remove the feeler gauge.

Then rotate the engine until the points fully close.

Now for a check/ test!

Turn your key to on. With a Popsicle stick or non-conductive item, "pry" the arms/ anvils apart (open the points a little bit) they should spark or even "pop". Barely opening them quickly over and over with the stick should result in "pop-pop-pop-pop-pop" with some sparking!

Put the distributor back together.

See if it will start!

Nothing?

Lets give this a try.

2 teaspoons of gas down the carburetor throat.

Connect the Positive side of the battery to the Positive side of the coil. (See pics 2 and 3). Give it a try now.

We may also need a ballast resistor installed permanently in the system. We will discuss that after we make it run.

I made the last 3 pics to aid a V-6 Jeep, I hope you understand them.

5th pic shows a 1/16 feeler gauge-meant for the V-6!

Your Turn,

The Medic
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Thursday, June 13th, 2019 AT 4:32 PM

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