I read through all 3 of these documents and they seem to be generic information not specific to the 3FE, but more so for the 1FZ-FE. Many statements of "on some models" and mentions of knock sensors which the 3FE does not have.
The only terminal on the 3FE ECU that is labeled NSW originates at...
Where are you getting this information from? According to the Toyota FSM and EWD, there is no input to the ECU from the NSS.
The only connection related to the NSS is the starter circuit which comes from the ignition switch.
I enjoy these discussions.
By unplugging the O2 sensors, your ECU that was designed in 1986 is in an open loop mode. It is now ignoring sensor inputs and running a preset set of parameters.
Now I'm not saying that the issue is not the O2 sensors, but it very well may not be.
Until you have...