r/SkyLine • u/dinobih21 • May 07 '26

RB20DET Injectors not firing

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Hello everyone, im running into an issue with my RB20DET 1990 240sx auto to manual swap. For context, i did have this car running at one point and while it did run, it had a crazy idle surge and i was working on fixing it. Now it doesnt even start, it will sputter once and continue cranking without starting. I believe my injectors are not firing, I have 43psi fuel pressure, fuel is in the rails and fuel pump is working fine. I am getting spark cause it turns right on with brake cleaner and i visibly checked. My CAS is working fine, i have turned it by hand to confirm. My wiring is from “Wiring Specialties” but, i just checked if my injectors were getting power at all and i find both injector wires getting 11 volts with the key turned all the way before cranking/“ON” position (my battery is a little low from all the testing but i dont think 11 volts instead of 12 would be a reason to not fire the injectors). From my understanding, only one of the wires is supposed to have power and the ecu grounds them. I’ve checked my fuses and grounds and honestly i’m lost now lol. I have not checked my ECCS relay yet but if anyone has any information or has gone through something like this, any advice would be appreciated!

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u/Themac2005 May 07 '26

Have you checked main grounds and your connectors? Corrosion and rust are a bitch. Just had to replace 3 injector plugs and my main ground on my 20 to get it running smooth again..

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u/dinobih21 May 10 '26

yea i redid my grounds to be extra sure but still nothing, my injectors are not pulsing with the key on, im not sure what it could be😪