Yes on the Bat, I would like to know the state of the Bat prior to starting. A fully charged Bat would be 12.7V but could be 12.5V
The ECM supplies 5V to sensors, and from your errors it starts to look like a bad sensor is drawing the voltage lower then 5V. Can measure the 5V running or not...
Get a digital multimeter and measure takes some measurements.
Battery reading motor OFF
Battery reading motor ON and has been reved just once to 1200 or so rpms
Check for 5V on MAP and MAT
I like epoxy, but just don't see that alone holding the box together over long periods of time. Using dowels is classic build, and if it was anything other then a boat I would agree. I would at least tab the edges with glass prior to epoxy
Another my Opinion:
Seafoam is snake oil, nothing can be fixed by spraying stuff down the bore. Others like the stuff. Your motor has sensors which may have issues with the chemicals
I think your sucking air or there is a restriction
Get a piece of clear hose at the hardware store and place it between the seawater pump and thermostat housing
As before, just my opinion, and who knows John may be able to do something. Could be he might get into the fuel tables, or reload a known good one. In link below John does discuss the differences with the 099 and 999. Eddie Young also discusses and he was the one which built my motor and...
Opinion: Bob at OBD has been testing them for much longer then John. As before John loves to talk and for him there is no one that is better then him.
That said, IF the ECM is causing the injectors to stay on to long, I don't see how that can be tested. The ECM is pulsed and a reading is...
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