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Bill,
The main switch is normally closed and opens when hot. The Bentley manual has this backward. The 59F/15C refers to the temperature of the engine, not the air. The factory switch has a round terminal, but some cars have the "upgrade" higher temp superswitch which opens at a higher temp. It has a flat terminal.
If the O2 sensor is not producing a valid signal, the system will not go into closed loop even if the main switch works. The sensor may be carbon fouled, you can take it out and clean it with a torch. You cannot use a heated or wide band sensor with CIS lambda, just the single wire BOSCH, which can be found for $20 if you are willing to splice the wire. The shielding is necessary, it is a long way for 0.1 volts to go. It sounds like you verified the ECU is pulsing the FV at the default setting. It also sounds like your digital WUR is wacky and raising the pressure too soon, do you have the original WUR ?
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Paul
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