5/21/21- Hooked up spark tester on both starboard and port engines; all 8 cylinders good to go. Pulled fuel rail on starboard engine to ohm out the injectors. All injectors tested out at 12.3 -12.5 on starboard. But while I was digging the injectors out, I found one heck of a surprise! See link below.
View attachment 151791
Yes, that is some crazy engineering, wiring injector 1 to injector 2. So while I had an ECU issue with injector one, someone thought it was a good idea to wire them together so they both fire at the same time (possibly to overcome an injector .
So I clipped the wire, installed the injectors and the fuel rail. They all seemed to fire, since the bad ECU was moved to port (comparing to the test performed on 4/18/21). At this point I was relieved and stressed about the wiring so I only did the YDS injector test on port side. Injectors 2 and 4 would fire, 1 and 3 would not. This confirmed the ECU being bad since I just swapped them. Finally, I confirmed I had a bad ECU. I then ordered a new ECU.
5/28/21 - Took off port side fuel rail, tested all injectors. Injector 2 ohm'd out at 18 so I replaced it. I also replaced the ECU. So everything fired up appropriately and seemed to run just great. Then a few hours later when I tried to start the starboard engine, it did not want to start. after 5 min of trying to crank it, bam... it worked like nothing ever happened. I think I am fighting a new issue now.
I am thinking fuel pump going out... maybe? Buying some in-line fuel gauges to get real time stats on the fuel pumps. Anyone have any other ideas? Its weird because this happened one other time, but thought it was related to my ECU. Once it starts, it runs perfectly.