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Yah, I will likely next go with the variable resistor route. I just have to find a small variable resistor (<= 1k ohm or so).
And if that doesn't work, I got a similar EGR valve sitting right beside me. The EGR valve in the car is driven by a pulse-width modulated 128 Hz signal. I'll hook the spare EGR valve up to the engine computer, piggyback the solenoid driver signal into a small microcontroller (likely a Microcore-11, since I have a few of them here that are gathering dust), and use that to drive the actual EGR valve. The microcontroller would then read the variable resistor, and multiply the EGR PWM signal by some percentage determined by the variable resistor.
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