Champion 435s.
That top don scanner tool has that nice testing function. You can test all the injectors one by one and it also tests all relays. Not bad for 60.00.

 

Will it read misfire counters? We already know it does fuel sync.

Pull one of your plugs, put the wire back on it, and ground it out somewhere "safe", crank the engine. Does the PLUG actually fire???

 

Alrighty, I'll try that in the morning.
It's getting hot again. Rather have the rain.🤷‍♂️
Still not familiar with the scanner, got it to change from metric to imperial. Guess I'll figure it out over time.

 

So I pulled the plug out and then reconnected it and grounded it. Nice good spark.
I tested the number 1 injector and its working. So I tested the tester 🤣 and it does work it through the tester. In other words by pressing injector #1 it works #1 and so on. I then tested all the injectors and they all do run when testing. I on purpose pumped the pedal and did flood all the plugs. Cleaned all the plugs.
So I am getting spark and fuel.
No "dead" cylinders. Since i took the plugs off for the 5th time to clean them I checked all the compression. Not the greatest 80-100 but no dead.
Again I checked for any codes, nothing. Cleared it cranked again and checked for codes again. Nothing.
The truck was running good until I parked it🤷‍♂️
To me, whatever "run" circuit in the computer isn't working.
Anything missing?

 

You have spark, you have fuel, but, compression is below spec. (100 is min.) Did you try doing a wet test?

 

Looks like the compression is all over the place. We'll see if I get a chance to wet test it.
One of my buddies wants the truck to put his Cummins in it.
I'll see what I decide to do with it.
It's just sad it ran good before I parked it.
Thanks everyone for the help.👍