Question about 1994 Jeep Grand Cherokee

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94 Jeep Cherokee won't start

My 94 Jeep Cherokee Sport 4.0 straight six was running fine. Parked it at night, and the next morning, it would crank, but wouldn't start.

Thought it was fuel, since no gas smell at the tailpipe after cranking, but there is pressure at the fuel rail, so I don't think it is that.

Pulled ignition lead: no spark (screwdriver near grounded metal method).

Pulled low voltage connector at ignition coil: 12 volts at black wire, no volts at green, with ignition on. When cranking, voltage at green wire only goes up to .1 or .2 volts.

All of the fuses and relays appear to be fine, but if you have a test that requires testing them in a certain state or method, by all means lets retest.

Any ideas?

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  • Joel Rutledge
    Joel Rutledge Aug 07, 2008

    I tried pulling the ignition coil, but was in a hurry, and couldn't access the bolts easily. So, I connected the coil wire to a new coil, along with the 2-wire connector. I attempted to ground the chassis, just in case, but not sure if it made good contact. Still no start... Other ideas? Thanks!

  • Joel Rutledge
    Joel Rutledge Aug 11, 2008

    Okay, after looking online a lot, I'm inclined to think it is either the Crankshaft Position Sensor or the Camshaft Position Sensor (probably the Crank sensor). It could also be a problem with the ignition module, which appears to be an integral part of the $50 distributor, and not a separate part?

    Turned the key on-off-on-off-on, and counted the Check Engine Light flashes: codes are 12, 11, 55. The 12 code is because I replaced the battery recently. The 55 just means "end". The 11 code means there is no reference signal during cranking, which could be the crank or cam sensors, or the distributor.

    The list of possibilities I have accumulated is:
    Crank Sensor
    Cam sensor
    Ignition Coil (replaced)
    Ignition module/distributor/pickup/stator
    ECM (computer)
    ASD relay (relay tested fine, but haven't checked the circuit yet)
    General wiring/ignition switch/circuitry issues.

    Did I miss anything? I'll post when I've replaced the Crank sensor: my wife's on her way home with a replacement. Oh, she's here, now: gotta go!


  • Joel Rutledge
    Joel Rutledge Aug 11, 2008

    SOLUTION FOUND.


    WOw. That crank sensor is a pain in the posterior, getting those two 11mm bolts out. But, after about 18" of extensions and a swivel, I got the suckers out!

    Guess what? It worked! Engine started right up, and ran just fine!

    The problem was the Crank Sensor, located on the driver's side of the bellhousing, just behind the engine. Follow the three pin connector near the back end of the fuel rail, down behind to find it.

    I hope this helps someone else!
    Thanks, folks!


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I believe the green wire is a pulse from the distributor and its a ground signal. I could be wrong since is been a while since i left the jeep dealer...I would take the coil out (2 bolts on most) and take it to autozone. They can test it in minutes for free. Either that or the ignition module but more common is coil.

Posted on Aug 06, 2008

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SOURCE: 94 Cherokee won't start

check the ecm and the crankshaft positioning sensor both will keep it from firing

Posted on Aug 18, 2008

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