i have a 91 ef sedan currently undergoing a dpfi to mpfi conversion mini me d15b2 y8 head swap same time but got confused when hooking up the injectors. Turns out I have high impedance injectors and those don't require a resistor box, i know 4 of those 8 wires go to the ECU 1-3-5-7 but the others for some reason I thought Tied together and went to the ECU a19 or something, turns out not for these injectors. ive searched for hours and hours only thing ive found say the block off plug is used and the connection is made at drivers side plug to main relay? i have the block plugs still from the harness , how I connect 2 them I'm not sure, anyone out there that has any knowledge of this that could help a fella out I'd appreciate it

 

First of all what are you trying to wire it as an OBD0 with vtec controller, chipped modified ECU? What engine harnes are you trying to use, your answer should be I'm using OBD0 DPFI engine harness to convert to OBD1/0 Vtec utilizing the missing elements I do not have. 4 wire O2, Vtec pressure and solenoid, MPFI fuel injector clips + Gray junction jumper. You just use 1 or 2 of the Yellow/Black power wires on the Drivers side engine bay harness connector via the short pigtail and pin them to the gray jumper plug, problem solved.

 

Each injector needs a positive and a ground to fire.
The ECU provides ground on the colored wires brown, red, blue, yellow.

The positive wires are all the same color - Yellow with a black stripe.
These 4 wires get combined together and go to the main relay.

When you turn the key on, the main relay will trigger and provide the injectors positive voltage.
When the engine is running, the ECU will send ground pulses to fire the injectors.