Which way do I turn my IAC valve to increase air?

The ECM go for it all of the worthwhile air restriction adjustments via electronically risk the movement of the diaphragm in the IAC which development also decreases the bypass exhibit via the valve. There are no mechanical adjustments on that IAC. I think the "knob" you are referring to is the black false cap covering the pour out inlet. That is not an ordering knob. It turns limited passing over it go for it not disarrange anything. It is just a plastic cap covering the diaphragm expansion vent and you can pull it off to clean the vent filter.