Hi,
If it won't start with starting fluid, it sounds like you lost spark to the plugs. First, pay attention to see if you hear the fuel pump actuator for a second when you first turn the key on. Then, I need you to check for spark. Here is a link that shows how it's done:
https://www.2carpros.com/articles/how-to-test-an-ignition-system
If you don't hear the pump and lost spark, I need you to check a couple of fuses and the automatic shutdown relay (ASD). The ASD will shut down fuel and ignition if it fails.
I attached the entire wiring schematic below for the powertrain management circuit. I highlighted the ASD relay and the fuses. First, confirm the fuses are good and have power to them. Here is a link to help:
https://www.2carpros.com/articles/how-to-check-a-car-fuse
If they check good and have power, switch the ASD relay with a different one in the fuse box having the same part number to see if it makes a difference. If there isn't one, here is a link that explains how to test a relay.
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-
circuit
The last pic shows the three fuses and the ASD locations in the under-hood fuse box.
Let me know the results or if you have other questions.
Take care,
Joe
See pics below.
Note: I had to cut each of the three pages of schematics in half to make them readable for you. I did overlap them so you can follow from one to the next.
Also, you listed this as a Jeep Laredo. Laredo is a package offered on different models. Since you indicated a V8 engine, I assumed it was a grand Cherokee. If that is incorrect, let me know.
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Saturday, December 11th, 2021 AT 10:48 PM