If you don't have this relay then you would need to check the location where the relay would be and you would find the plug for the sensor. You would then see if the Blue/Red wire supplying voltage to the relay is jumpered to the Blue/Green wires which power the fuel pump.

 

Id say without question I do NOT have that relay in place. I dont have the wiring to the location either, as it was on the body harness from the donor car, which I no longer have. Does the ecu need to see this 12v/2v signal to fire the injectors?

 

No, it does not. Voltage from the Circuit Opening Relay runs to the relay you don't have which then runs to the fuel pump. W/o the second relay then your Circuit Opening Relay must then power the fuel pump.

 

Oh okay thats basically the way I have it run now. That marks another "why wont the injectors fire" option of the list...

 

Have you connected an LED light to the ECU to verify that it was properly trying to send a signal to the injectors? Did you ever address the main engine ground. Did you check timing.

 

Ive tried testing the signal wires from the ecu using a voltmeter, to see if the 12v signal drops at all from the grounds hitting and it doesn't appear to be. Never thought of an LED, that's a good idea, I will give it a go. The grounds that are meant to go from the ecu to the engine all appear to be good. Both from visual, and the continuity from the wires at the ecu to the chassis itself. I checked continuity from the plugs on the ecu for the engine grounds to the passenger seat front bolts, and got clear continuity. I have not checked the timing no and I will do that as well. Do you think timing would be the issue if I'm seeing like, absolutely zero fuel on the plugs? not even a smell of it if I crank the the car with no plugs in.

 

If you try the LED trickthen focus on the primary injectors since the secondaries don't work upon starting or idling the engine. One wire goes to the Light Green injector wire and the other LED wire goes to a pin which has voltage w/key to start (pin 1B B/W wire). If the ECU is correctly firing a primary injector the bulb should flash. 3W=front primary and 3Y=rear primary.

 

So when tested at the ECU both injectors are firing which is... puzzling. Could it just be that the ground isnt strong enough or something? I was pretty confident that it wasnt going to set off the LED, but in a very metered manner, both of them seem to be firing. At least at the ecu.

 

Check the timing.

Post #9 in the link.

https://www.rx7club.com/2nd-generati...estion-978911/

 

Checked it, and it was exactly as pictured.

 

Have you checked for spark recently? Are the fuel hoses, send and return, connected in the proper order or are they perhaps switched?

 

Spark is good and fuel lines are on the proper ports.

 

Thinking I might just run new grounds from the ecu to the engine. I know I checked them already, and have checked time and time again, but maybe it just isnt strong enough.

 

any updates?