Quote Originally Posted by Nisshead View Post
It would be the higher current which would make the wire red hot.
From a quick bit of research it looks like all hot wire MAF sensors have this "burn-off" function whey they heat( up to1000c) to burn off any crap on the wire. I suppose if they didn't have this function there would be a lot of cars playing up..LOL
For the current to increase you need to increase the voltage, current = voltage/resistance and the resistance of the MAF is going to be a constant so the voltage has to increase to increase the current. They could do this but I would not have thought so but will read up to see.
My fuel economy varies considerably, if I am driving it and not towing I get between 11 & 12 l/100km. the wife usually drives it to and from work which is only 5km from home and she gets around 15l/100km. Have tried to teach her how to drive properly to get better economy but that did not end well.