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<font face=\"Verdana, Arial\" size=\"2\">Anybody know what kind of power loss I would experience if the switch weren't working?</font>
If I remember my wiring diagrams and KJetronic details from when I was racing my GTi in Showroom Stock (yep, mid-to-early-1980's) it does the exact same thing as the temperature sensor on the port side of the head in the water line. That switch changes the duty cycle and goes open loop when the car is cold (just as Bill said). The full-throttle switch does the same thing on full throttle after the car is warmed up.