Why is it that my mass air flow sensor works worse on hot, humid days?

Answer by  kipcat (1964)

Well this is a likely incorrect category for an automotive problem. There is no mass air flow sensor on furnaces and air conditioners, but I can tell you that there is likely a crack in the vaccuum line to the pressure switch.

Answer by  japratt (1687)

The air flow sensor seems to work better on these days because it is not freezing over. If it is hot then then sensor will not freeze over and work.