> I had forgotten about your project. Is there any way I can help from a
> long distance??
>
>
Well, the only I don't know that's critical to the design is what, exactly,
the Idle Control Valve takes to operate. Really, that's the whole deal,
there. All the rest of it is binary inputs: PS pump switch, AC switch,
ignition pulse for counting RPM. Once I know how the valve operates, I could
theoretically just tune it in via software. That's the tough part though. So
far the voltmeter just shows a constant voltage. I need an oscilloscope or
the like to see what it's doing. Might be using pulse width modulation or
something, but I can't tell. The optional data logging module for the
Innovate LM-1 wideband O2 sensor tool works something like an after-the-fact
oscilloscope, but it reads only 0-5 volts at the inputs and I'm not yet
certain the valve control won't spike and fry it. Yeah, I know, a zener
diode and a couple resistors; I can't remember the last time I had the
energy to make a trip to the electronic parts place...

--
John Bange
'90 Vanagon - "Geldsauger"