EFI fuel injector testing

[Vic Norman]

Thanks to everyone who responded to my questions about testing EFI fuel
injectors. One very interesting suggestion on how to verify that a signal is
being sent from the ECU to the injector is to use a noid light. I'd never
heard of such a thing and thought someone was putting me on, but they do
exist, most autoparts places carry them for a few dollars. Simply plug one
into the wiring harness in place of the injector and crank the engine - the
light will flash if it receives a pulse. Simple and cheap!