Correct.. What are the odds of a bad ground or a open circuit. The only thing I've ever heard of similar to this was Charles red truck where the ipr just decided to do its own ***n thing rather than what was commanded, iirc he never figured it out either
I'll check it out.. What do you think the odds are that the ipr wires may be chafed on down the line? Truck only has 46k but 3000 hours on it.. Spent most of its life with a crane and boxes on it
This may sound dumb, but I have seen it before... Are you sure you do not have the IPR wiring harness connected to the EBPV solenoid and the EBPV solenoid harness connected to the IPR? They are the same connector.
I took the whole harness off the fuel bowl, fuel heater ect.. Never touched the ebpv. As far as I can tell with the schematic that was posted up power to everything in that area is the red wire, the red/yellow stripe is the voltage signal from the PCM as to what percentage the IPR closes. To me the problem lies somewhere along that wire either it's rubbed through or has a bad connection at the PCM