If you have good fuel pressure and it starts only with starting fluid, we need to check the injectors.
At each injector there will be a black wire with a red tracer. This is the power supply to the injectors. With the key in the on position, check to see if you do have power at those wires. You can use a test light to check.
If there is power, I need you to do the following:
Note that in addition to the black/red wire there is one that is a different color at each injector. That is a signal ground that is provided by the powertrain control module (PCM) Based on input from other sensors, the PCM provides a ground to specific injectors to fuel a cylinder. If you have power to the injector, we need to confirm ground.
You will need a helper. Disconnect one of the injector connectors. Using a test light, connect the alligator clip to the battery-positive terminal. Then, probe that wire that is a different color than all the others. Have a helper crank the engine. The test lamp should flash on and off when the injector is to fire. If that doesn't happen, we need to check the wiring to the PCM and the connectors.
If that all checks good, suspect a faulty PCM.
Let me know what you find.
See pic below.
Image (Click to make bigger)
Thursday, December 8th, 2022 AT 9:20 PM