for some reason the injector on cylinder 4 is not working. i checked for spark, i have spark. i replaced all four injectors, still have the problem. i used the noid lights to check for voltage on injector plugs.i have voltage on all of them except number 4 cylinder. so i replaced the ecu.still have the problem. i replace the injector resistor box , still have problem . tomorrow im going to check the wiring because to me thats the only thing left . if you please can help me try to determine or find out whats going on.by the way i have pr3 obdo ecu b16a

 

anyone??????

 

you should see voltage from each injector clip, power from the res. box is always going there. what changes and actually makes the injector function is the ground that the ecu sends. so it makes most sense to me that the wire which controls the #4 injector is not making its way all the way back to the ecu for some reason. It should be a yellow wire at position A7 at the ecu.

 

distributor distributor distributor. I had a similar problem. Ask a buddy if you can borrow one just to be sure.