Question about Jeep Grand Cherokee

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I have a 93 grand cherokee and the spark is intermitant once the spark comes back it will start and run well but if you let it set for 10 minutes you have to crank it over then turn the ignition off and on to get the spark to come back

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  • wasland_66 Oct 13, 2010

    i have tried to change the crank sensor the pick up coil the map sensor but now i've noticed that if you leave the key on for a while the asd relay and fuel relays will click alot then i will have spark i've cleaned up all the grounds that i can find changed relays around and still does same thing

  • wasland_66 Oct 14, 2010

    there isn't a theft alarm system or keyless entry to this jeep

  • wasland_66 Oct 15, 2010

    thank you

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  • Master
  • 1,016 Answers

Hi,

It seems you could have a fault one of these:
1. The crank angle sensor.
2. The camshaft Position sensor.
3.The MAP sensor.
4. The Control module for the Keyless entry alarm if one is fitted to this vehicle.

Get these areas checked and let me know if you need more information.

Thanks

Jason

Posted on Oct 12, 2010

  • Jason Maurirere
    Jason Maurirere Oct 13, 2010

    Do you have an alarm system in this vehicle.
    If the sensors in the door locks and the ignition switch assembly may not be switching the alarm system off correctly until you have turn the key back on again then it switches off.

  • Jason Maurirere
    Jason Maurirere Oct 14, 2010

    Ok the next thing is to check the voltage to the ignition system and all connectors. The the ignition module checked also and check the distributor cap for pitting of the center electrode in the distributor cap.
    If all this is 100% then you need to check connections to the ECM as well as voltage supply and signal voltage from the distributor to the ECM and from the sensors to The ECM and then from the ECM to the distributor.

    This is a very big job to do but if you do each area bit by bit you can isolate the problem.

    Or the best thing to do is get a OBII scan tool and extract any fault codes which will be in the ECM data system.

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