I have an '89 Jeep Cherokee 4WD, with 6 cyl engine.

Once in a while it will act up and not start. When i say it won't start, i mean it turns over like mad, but just won't crank. It has always in the past eventually cranked.

But, now it won't budge. it turns over like crazy, but won't start.

Any ideas?

 

I think you mean "it won't run".....

Check my "The Basics" post the next time you have the trouble.

 

NOT A JEEP TECH, BUT, I DID SEE ONE OF THESE WHERE THE BALLAST RESISTOR TO THE FUEL PUMP WAS FAILED. IT'S A WHITE PORCELIN RETANGULAR LOOKING THING WITH TWO WIRES GOING TO IT, SITS ON THE LEFT INNER FENDER, NOT FAR FROM THE RADIATOR SUPPORT. TRY DISCONNECTING IT, AND JUMPERING THE TWO WIRES TOGETHER. IF IT STARTS, GET A NEW BALLAST RESISTOR.
FIVE BUCKS DOWN TO PARTS ADVANTAGE.
ARE YA HAPPY NOW JOE?

 

Happy about what?

 

THAT I RECOMMENDED A BALLAST RESISTOR FROM AN AFTERMARKET STORE.

 

Ya, nothing wrong with an aftermarket part.

 

Alrighty then.

 

There's a TSB about an updated crank sensor and harness for most of those older 4.0 6 cyl. jeeps. Before replacing parts, find out if you are getting fuel to the engine, and are you getting spark to the spark plugs..A noid light for the injectors would be very helpful also!!
But as you'll see all over this forum, check the basics first... Air, fuel, and fire...

 

Good point by MSA.