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Question: 1999 jeep cherokee 6 cyl 4wd cranks but wont fire.?

(Posted by: Rick on 2010-02-07 09:21:10)

My son has a 1999 Jeep Cherokee, 6 Cyl, 4wd 4.0L engine. He was driving and it died on him. I will crank but not fire. or even come close to turning over. We had a diagnostic run on it and it came back with a Crank Sensor Error and a no fire reading. We replaced the Crank Sensor, and still did not start. So we replaced the Dist Cap, Rotor, Plugs, Plug Wires, Coil, and pickup and it is still doing the same thing. Just to make sure a weak battery wasnt contributing, we have a jump pack on it when we try to start it. The Rotor is turning so the timing chain, is still intact.

Posted by: idontgivafork on 2010-02-07, 09:32:55

Get out your repair manual.best i can do,check obvious first, then start tracing circuits for either ground or open loop.id say it was in the ecm, but they are expensive. rule out the obvious first.

Posted by: sasyone on 2010-02-07, 09:31:07

The last time I seen that problem it was the crank angle sensor that caused the problem,If you have no spark you need to check to see if you are getting voltage from the ignition switch to the coil first,if you are check that spark is coming out of the coil,you could have a bad coil pack.That's about all I can think of,Im sure there is a computer in that system I hope its not that.Good luck to you.