1989 Mazda 626 Repeated Fuel Injector failures

Non-Turbo

Had a #2 fuel injector failure and had it replaced with a rebuilt. It ran great about 100 miles and #2 fuel injector stopped again. It was replaced with another rebuilt. Again about another great 100 miles and failure. It was replaced with a new injector.
#2 cylinder went dead after 32 miles.

Compression is good.

Wiring diagram shows that #2 and #4 are tied common to the engine computer but #4 works fine.

All injectors make same active ticking sound.

Ignition wires and plugs were swapped. #2 cylinder remains dead. Distributor cap and rotor in good condition.

All injector resitances are in spec.

Pulling injector #4 wire does not cause #2 cylinder to fire. So engine controller is not being driven down by #4 injector.