Update:
Checked the harness over the weekend. Applied 12 volts to injector side wires and tested on the FICM sided wires, all 4 wired checked out as working wires, unless there is other proper way to check on it. Also, it passes injector buzz test. Changed injector again just to be on the safe side, no luck.
Originally Posted by
3000 FPS
One other thing to check is the FICM fuel injector control module.
Is there a way to check FICM without taking the truck to the dealer?
Could it be something wrong with the cylinder itself, like HG leaking or rings or something else?