Bob Ayers
Well-Known Member
I dont remember if the coil in bosch injectors is usually submerged in fuel or not. If it is, I could see fuel eventually eating the insulation.
Either way, there is small amounts of movement in solenoid coils from mechanical load and vibration....that could fracture them or strip the insulation off of them over time.
Incidentally, when a cylinder is dead, the engine works harder, and the engine will get more fuel despite the O2 sensors, through the adaptive nature of the computer.
There are no EFI injectors (Bosch, Lucas, Nippon, etc.) that have fuel contacting the coil.