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1999 Jeep Cherokee ENGINE STARTS BUT DOES NOT FIRE!

Tiny
JORGE RIVERO
  • MEMBER
  • 1999 JEEP CHEROKEE
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
HI, COULD YOU TELL ME WHY MY1999 JEEP'S ENGINE WILL TURN OVER BUT NOT FIRE? I CHANGED THE COIL AND THE SPARK PLUGS ARE GOOD. I AM THINKING IT MAY BE THE CRANKING SENSOR BUT I AM NOT SURE HOW TO ACCESS SENSOR ANY SUGGESTIONS?
THANKS JR.
Saturday, June 28th, 2008 AT 7:01 PM

3 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Buy a decent spark tester and check for cranking spark at all cylinders.

Get back with the results.

If you have spark it should be bright and blue and not erratically firing either!

You could also dump gas down the throttle body or spray starting fluid down it and have somene attempt to start it, does vehicle run?
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Saturday, June 28th, 2008 AT 8:43 PM
Tiny
JORGE RIVERO
  • MEMBER
  • 2 POSTS
I have tried all that you have suggested and even changed the coil, still no spark or fire. What can I do?

Thanks JR
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Monday, June 30th, 2008 AT 8:01 PM
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
While cranking the engine are you getting a rpm reading on the tachometer/rpm meter if you will?

If your not getting a rpm signal you either have a bad ignition primary circuit failure or crank shaft sensor failure.
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Monday, June 30th, 2008 AT 9:48 PM

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