No experience with said oil burner. Theory of operation. OEM wiring diagram, shared circuits. Something changes. Compare live data plugged in vs not. Back probe cam sensor wires at ECM all three wires? Plugged in and unplugged. Scope the the signal wire Check ref and signal for short to ground Not sure what the ECM diag capabilities are. Check all wires for load capability Seems wire harness’s are more prone to damage than automotive. Assuming no one has been in and not secured things. Interweb indicates cam sensor connector is same as egr and maybe something else. Rust jacking in auto world. As in it moves sensor to far away. Spinny thing on cam integrity. oh Power and grounds. Main electrical and ECM.