Cranks, but won't start

SOURCE: my 93 jeep grand cherokee

What all have you checked as initial steps? Have you checked the fuel filter as first and foremost step and also Is the check engine light ON?

SOURCE: cranks but won't start sometimes.

From what i've seen over the years with the Chryslers i've encountered. Your describing to the "T" what appears to be a bad Crank Sensor. I will bet money that if you replace the crank sensor it will solve your problem. BUT...Also know that a bad fuel pump can do exactly what you describe in your statement. Once the pump get hot it gets to acting stupid, but yet again so can the Crank Sensor. Still, my money is on the Crank Sensor.

Iron

• 3018 Answers
• Posted on Sep 06, 2011

SOURCE: 1992 jeep Laredo keeps blowing 30 amp eng. cntrl

• Hi, I can help.

• You a direct short somewhere that is blowing the auto shutdown fuse as soon as a completed circuit is attempted.

• Look at the connectors and wiring for your Oxygen sensors. Your shutdown relay is wired into them as well. Try removing the connector to one O2 sensor at a time and try to start the Jeep. The ones towards the back seem to rub through from the drive shaft. If the fuse does not blow then that wiring is your problem. This has been a big pain to people who own your Jeep.

• Make sure to have plenty or the 30 Amp fuses for testing because it will continue to blow until you find the wire with negated insulation and re-insulate it so it does not short anymore. Make sure to never use a bigger fuse. Only the proper Amp fuse every time.

• If you have any comments please feel free to leave them here and I will respond to you.
• Hope this helps and thank you for using FixYa.

SOURCE: cherokee won't start it cranks but won't

i dont know if this helps, but i know in some models, the security issue is caused by the key itself. if there is an rfid chip in the key and it is not responding to the computer, the motor will not start. try using your VIN to get a new key made at a dealership.