I don't know the answer about the voltage to the aux air valve. I do recall something about the cold start injector being updated if the old one was butterscotch in color. I've experienced poor cold starts due to light oil fouling from worn valve seals. Replaced the seals and plugs and it worked.

Currently, after (years) the valve seal replacement, experiencing intermittent very hard/long crank starts only when hot, all cold starts excellent...go figure.

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