If you have 40 PSI at the fuel rail, and the noid flickers when you run the engine by manually putting gas into the throttle body, that would indicate to me that the injectors are clogged. The 40 psi says the injectors are getting fuel, and the flickering noid says that the ECM/ECU is sending the signal to the two banks of injectors. That only leaves the injectors. You didn't use a silicone based grease on the fuel injector o-rings, did you? Silicone grease can/will clog the injectors.
Did the injectors work before you connected pin 41 to ground? If so, disconnect it and try running the engine. All the manuals and Ford service literature that I have show a 3-wire O2 sensor, but they are clearly 4-wire. The schematic doesn't make sense, as it shows the O2 sensor ground (49) totally separate from the O2 sensor (?). I would think that one wire is 12 volts + for the internal heater, another wire going to ground for the heater (this wire should go to the back of the passenger side head), another wire (29) is a + signal wire to the ECU, and the last wire would be the O2 sensor ground/- (49). This is how I have always understood the way it's wired.
If disconnecting the ground that you connected to pin 49 makes your injectors work again, then I would think the above description is correct. But the best way to tell is to trace the O2 sensor wiring on your working '89 to be certain where the 4 wires are going. If it wasn't dark outside I'd crawl under my truck and trace them out because now I'm curious
.
I've attached another page I missed the last time that has some useful info regarding code 41 and 42.
And here's a link that I think supports my thinking on how the O2 sensor is wired. See the diagram at the bottom of the page.
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