Quote:
Originally Posted by Ford Man
Warm air is less dense and has less oxygen molecules therefore less oxygen in the exhaust stream for the 02 sensor to detect and the IAT sensor sends a warmer temperature reading to the ECU, which fools the ECU into thinking the outdoor temperature is hotter than it actually is and leans out the mixture. All cars run richer when cold air is being introduced into the engine. Many have found that warmer IAT's increase their mileage.
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ummmmm,,,,, well, no.
it takes a certain amount of oxygen molecules to make a certain amount of power. If the molecules are warmer, they take up more space, so you have to give more throttle position to get the same amount of power.
But when done, it still takes the same number of molecules to make a certain amount of power.
If the molecules were colder to begin, expansion ratio would be higher, making the engine more "efficient" = more power with identical amounts of fuel and air.