Question about 1997 Jeep Grand Cherokee

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Jeep won't start

The jeep will turn as if its trying to start, but then it kills. If I give it gas while trying to start it will start. as soon as I release the gas it kills again can you help me.

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Sounds like a crank sensor.
The crank sensor is usually mounted at the seam between the engine and the transmission. It has three wires: one will have 8V on it compared to ground when the ignition is ON, and if you measure the voltage between the other two wires you should see ii switch back and forth between 5V and 0.3V as you turn the engine by hand using a socket on the crankshaft bolt, again this is with the ignition ON. If you don't get that then the sensor is bad. You can read these voltages by using a very fine pin pushed thru the insulation of the wires to make contact with the conductor inside.

Posted on Nov 12, 2008

  • rubbercitypi Nov 13, 2008

    my problems started the EXACT SAME WAY on the EXACT SAME TRUCK!!here is the rundown on my cherokee and im still not fixed yet but it may help you.

    "i have a 97 cherokee with a 4.0 that's not getting any spark. i have
    replaced the coil. i visually
    inspected the cap and rotor and checked injector pulse. all the gauges
    work on the dash and the info cluster. all the fuses are good under the
    hood and in the vehicle. the fuel pump kicks on fine. any idea's ?? i
    was told that if the crank sensor is bad but i
    tested it with my volt meter and am getting between 5v and 0.3 v on one
    wire and between 3 and 4 volts on the other.i replaced the crank sensor
    because it should have 8 volts on that wire but it didn't solve my
    problem. i have also pulled the codes and they are reading 12_54_55.
    54 being the cam sensor which is inside the distributor on this model
    and year jeep, however before i swap that for a new one i tested the
    power to the coil and with my test light grounded i get power on the
    green / orange wire. but with my test light swapped to positive I'm
    getting no ground pulse on the gray / black wire so this could be the
    pcm. " diagnostic work is a pain but what else can ya do?? this would've cost a fortune at a shop. hope it helps you



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