Another engine problem that could give the same result as an injector not firing could be a bad earth circuit. This could be something as simple as the battery negative being corroded.
When removing fuel injectors from the engine you must depressurize the system beforehand. The manufactures specs for injector leakage is 2 drips per min.
And for flow rate 5% cc. per minute max to min.
Three injectors require attention.
No.1 injector had an offset spray pattern.
No.2 injector had a leakage problem.
No.4 injector spray pattern was a combination of offset and poor atomisation.
No.3 injector was the only injector in good condition.
Petrol fuel injector testing.
Battery V inj1 inj2 inj3 inj4
13.5V 13.12 13.42 13.23 13.33
Injector is firing yes yes yes yes
Duty cycle at idle(%) 50.6 50.7 50.8 50.2
Duty cycle at 2500RPM(%) 42 46.7 42.8 45.3
Hz at idle .564 .586 .587 .584
Hz at 2500RPM 14.8 9.4 10 9.07
I found that duty cycle was a better way of measuring, as the hertz reading on the screen get flickering and I couldnt get a decent reading.
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