Quote:
What would make the potentiometer output change from 0.2 volts dc - engine off - ignition on - to 2 volts + with engine at idle at 750 rpm...
...the answer of course is the position of the potentiometer measuring the air flow plate motion but that much for such a small movement is mad.
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The system pressure, which is constant, balances the "air-flow force" on the sensor plate via pressure on the plunger in the distributor - with the engine ON (at idle). The 0.7 V output should
correspond to a small deviation from 0 degree deflection of the plate (approx. 5 bar system pressure on the plunger and "idle air force"). 2 V corresponds to about 3 or so degrees of deflection of the plate.