I don't mean to steal your thread. Are you able to measure the pulse that the valve is getting? I might make my own idle controler and would like some measurements of what a working system is like. IE. Frequency, pulse width and voltage. I'm only asking because it seems to me you've fixed your problem. BTW, For those who think otherwise, the cold starting valve is a different valve than the Idle speed valve.

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iThink Different
Building an all new electrical system in my
1985 500SEL