Quote:
Originally posted by Zero10
Because when the fuel pressure goes up, it takes more current to fire the injectors. Eventually the current required gets high enough that the DME can't supply it. The injectors are fired in pairs, so if you unplug one, that one pair can fire, usually lowering the fuel pressure enough to allow the others to fire too.
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They may be wired in pairs but I think they are fired at the same time, so removing one injector will reduce the load to the DME by 25%.
I still think the DME should handle any small extra load that may be caused by excess fuel pressure. I would check all the wiring before condemning the DME.
Probably a faulty ground which when loaded with 4 injectors in parallel will cause less voltage to go to the injectors and more to the faulty ground connection. If you remove one injector the voltage to the other three increases while the voltage to the faulty ground decreases causing the 3 injector to appear to work normally.