Cranking but not starting

1993 JEEP CHEROKEE
276,000 MILES • 4.0L • 6 CYL • 4WD • AUTOMATIC
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ROHINBLANCHETTE
  • MEMBER
  • 1 POST
My vehicle was just running bit now it won't start, it's cranking but not staring.
May 20, 2022 at 9:09 PM
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SQM
  • Experienced Mechanic
  • 6,383 POSTS
Hello,

Generally speaking, an engine will need spark, fuel, and compression to start.
So, if it is just cranking but not starting it could be due to an inoperative fuel pump, bad ignition coil or plugs or issue with compression.

When you turn the key to the on position can you hear the fuel pump come on?
Do you know if you are getting spark to the plugs?

Take a look at this guide, it covers the typical diagnostics of crank no start issues:

https://www.2carpros.com/articles/car-not-running-advanced

Go through this and let me know what you find or if you have any questions.

Thank you.
May 21, 2022 at 1:09 AM
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SQM
  • Experienced Mechanic
  • 6,383 POSTS
Many times, you will get the crank no start due to a bad relay for the fuel pump, or it could be a faulty pump as well.
First check the relay. It is located inside the Power Distribution Center. The Power Distribution Center is located next to the coolant recovery bottle (See diagram below).
Check for any corrosion or burnt pin(s).
You can also test the relay:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

If the relay checks out but the pump is still not turning on it could be due to a wiring issue or a bad pump. You can check to see if there is power to the pump by using a multimeter. If there is power, then the issue is likely a bad fuel pump.

https://www.2carpros.com/articles/how-to-check-wiring

Let me know what you find.

Thank you.
May 21, 2022 at 4:03 AM
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