Ok .... what will a TBI motor do if the connectors are not on the right injector?

I see the wires are color coded so that must mean they have to go to a specific injector. Or does it matter. If they have to be put on the correct injector which one goes where?

thanks

 

This is a good question and I don't know the answer. However, I too have noticed that not only are the wire colors different, but which pin on the injector the +12 volts goes to is different. It is either the outer pin on each injector or the inner pin on each injector.

The injectors are keyed into the pod so one goes in a particular direction, and the other injector is rotated 180 deg. Which places the pins in opposite sequence.

I have never read anywhere (including the FSM) that the injectors are polarized. Or that the injector connectors are particular to an injector.

With all of that what I do is to make sure that the +12V side of each connector is the opposite of the other. (so far this sounds confusing). That is, either the outer pin on each injector gets the +12V, or the inner pin on each injector gets the +12 V.

RBob.

 

Just have a look on the efi system wiring diagram ...

 

The polarity likely wont matter as there is just a solenoid coil in the injector itself. No matter which way the magnetic field is oriented, the pintle will still be pulled towards the coil and the injector will fire. Also, given the firing order of a SBC and the fact that theres no reference for which cylinder is about to fire, its unlikely that it matters which way the injector drivers are wired to each injector. The wiring could be just for ID'ing where the wire goes in the harness and the alternating fire probably ensures proper fueling and lessens the current flowing back to ground.

As for which pins get the +12V, I agree with making sure that they are spaced on opposite sides. I could see myself accidentally shorting one of the drivers out if there was a +12V next to an opposite switched lead.