Hoplite808
Well-Known Member
- Jan 11, 2022
- 507
- Boat Info
- 1996 Sea Ray 270 Sundancer
- Engines
- Mercruiser 7.4 LX MPI EFI (Gen. V)
Whose injectors did you replace with? Did you put a noid light on the injector plugs to check for a signal?
Just finished checking it all again and swapped the old injectors back onto it. Since I found the wiring schematic for the injectors I decided to verify them and found the previous owner had reversed the connections for cylinder 8 & 6 injectors. I corrected that now. It runs again but still won’t go over 2000 rpm under load.
Upon closer inspection there are actually three wires near where the ECU and relays mount that I can’t identify. One is the large 12 gauge wire which it turns out I remembered the color wrong. It’s black and when tested it appears to be a ground but if I connect it to ground the console alarms go off. The other is a solid white wire and the last is a white wire with a pink stripe that someone spliced to lengthen at some point. Neither of these wires test to seem to have any sort of DC + or - connection. Also both have a similar connector as the temp sender wire has. These wires appear to be taped into the same part of the harness that goes down to the alternator.
I connected my continuity tester and counted the beeps. The ECU only is throwing code 12 which means it’s working and there are no fault codes stored. I am completely at a loss as to what is wrong here.