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Thanks, I thought it would be something to do with PWM ...
I plan on using a PIC controller with inputs from the revcounter, oil temp sensor and an idle microswitch at the throttle.
It would act as an auxiliary air valve during cold starts and when warm would stabilize idle.
My car has already a microswitch in the throttle linkage, but I don't know what it's used for (idle, fully open throttle ?)
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