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Thanks... I dont know why I can never remember the loop
and I worked with injection for over 20 years.. but
I did the mechanical part.. nothing on the electrical part




"closed loop" is controls terminology, it means that the feedback control loop is being used. In other words the controller is looking at the output of the system and feeding that information back and adjusting the input. In this case injector duty cycle is the input and O2 is the output. If you are "open loop" you are working purely off a control map based on the inputs of all the other sensors to determine duty cycle and not using the feedback of the O2 to adjust.

-Michael

Michael 1968 Barracuda Notchback Coupe 440 EFI 6-pack, T56 Magnum 6-spd