SR20DET No Start

SON240sx Automotive
1

I recently purchased Brendan’s (simplemind7) SR20DET S13 for a winter beater, and drove it for a few weeks with no issues. Before I drove it however, I fixed a right rear wheel bearing, put aftermarket turbo back exhaust on, and changed the O2 sensor (not sure if this is relevant but I decided to say it anyways). Last Thursday, I drove it to work with no issues. When I went to start up the car after work, it just cranked and didn’t fire up. So I started diagnosing. I had no spark and no fuel injector pulse. Brendan told me he didn’t solder the ignitor connector, just twisted and taped them. So I soldered all those connections (he had a Z32 ignitor if it matters, with a couple wires doing nothing). After doing so I had spark, but still no fuel injector pulse. After a long weekend of diagnosing the MAF, CAS, TPS, CTS, and all wiring, everything turned out to be in working order. But I still had no fuel injector pulse. I decided to start replacing parts. Tried a buddy’s ignitor, with no change in symptoms. Tried another ECU, figuring the injector drivers might have gotten burnt by the ignitor wires grounding out, but this was not the case. So here I am, on a Sunday night, with a broken car. If anyone has any suggestions, I am very open to them. Thank you in advance.

P.S.: I have gone through all the diagnostic procedures in the FSM for the injector, CAS, TPS, and most other circuits, but nothing seems to be helping.

The setup is a stock SR20DET blacktop, only modifications are an FMIC and a Koyo radiator. The car also has a remanufactured ECU part number 2731M 50F05. There is no provision to read codes on the remanufactured ECU, however on my friend’s ECU that I tried it flashed a 55.

Edit: Forgot to mention I am getting 12v (maybe 11.8v) to the injectors, and the wire that goes from each injector to the ECU, all of them have continuity, and not shorted to ground. Also, I have lots of fuel pressure. The car will start fine with starting fluid/ether, so I believe the only issue is the lack of fuel injector pulse. TPS also tested out to be fine and not entering clear flood mode. My next step is going to be to try yet another ECU, and perhaps try a different CAS.

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sounds like a cam or crank sensor issue. Check to make sure that the wire on the coolant sensor didnt get knocked off either.

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UPDATE: I seem to be getting 5.8 volts to the injectors now… wiring related problem perhaps?

Edit: Took apart the whole wiring harness today, and turns out the positive wire that feeds the injectors is crimped by factory, and it was all corroded, two red wires feed the 4 injector wires, and one of the main red wires was corroded off. Have yet to see if the car will start now…

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That was indeed the problem. Good thing I double and triple and quadruple (you get the point) checked everything, I guess the wire was barely holding on, which is why I was still seeing 12 volts at the beginning of my diagnosis. Thanks again to all who helped.