Could someone explain how the fuel injectors are fired?
Apparently there are only 2 wires coming from my ecu D15 and D16 which switch to ground firing 4 cylinders each time.
the other wire is connected to 12v all the time.

Is this correct?

 

The injectors have power through fuses and are grounded by the ECM, all 8 at once (it's called "batch fire"). They are fired on EVERY revolution, so twice per firing cycle.

Hope this helps.
Lou

 

yeah, I think I got it. Im trying to read the rpm's and Im reading the pulses just might have to adjust the multiplier.
1000 pulses/min should be 1000 rpm