Truck in question is a 89 S10. The two TBI injectors are not spitting any fuel. At first look we guessed one of the possible reason was the state of the connectors:
So we ordered new connectors but managed to forget which wire goes where. I am assuming here the circuit is: once engine is on, 12V is provided to the injectors and the ECU then will ground the other wire to open them. I am also assuming, because I do not have the diagram and because of the nature of TBI, that both injectors fire together, so it is possible there is really only one 12V wire and one ground wire down the harness. I could be wrong, but, without a diagram that is all I have to play with. In any case, using a multimeter, we thought the power wire was the pink (or whatever you call that colour) with a black stripe wire and the green and blue wires were the grounds to ECU. Based on that, this is how we wired it up:
When we tried to crank, nothing happened. Well, we are getting 12V at the red wires, but the green and blue wires are not grounding as the engine turns. What did we do wrong? Does anyone have a diagram we could check? We are trying to get it running tomorrow morning otherwise we need to grab my car dolly before the apartment complex call the tow company to make it go away; they have already left a notice on the car today.