heres the deal, my car does not idle properly, it stutters, jumps, dies, yatta yatta, i only have one injector shooting at all times, at first i thought the other injector was faulty, but i switched the connectors around and the injector worked, so injectors are ok, i probed the connectors i have ground at both but only one has power, no i dont know if the gm computors control power or ground, i dont think i have a break at the harness but its a possibility, i dont beleive its a fuel pump problem, i dont have pump issues
so does anyone think its the computer, cause i'm getting tires of this problem
dont have lots of time to work on it, the dam car wont go over 2000k
checked vaccum, checked ignition, anyone got any ideas or tests i can perform, gonna get the wiring diagram but i still want some feedback from u tbi experts, summers comming and my car is not tip top shape, help an f-body buddy out, thx

 

Both injectors should fire at all times - ECM just controls how much out of both, but not individually - they both shoot same load at all times (I guess that could be worded better lol) - so it sounds like a wiring problem that needs traced down.

 

To answer your question the computer controls the ground to the injectors. If you have a logic probe or a meter with a logic function you should be able to check for switching voltage on the ground side.