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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No. The mixture stays at 14.7 (or however close your factory ECU can hold it to this number). It takes a mass X of air to make Y power. The warmer the air, the higher the volume. The higher the volume the wider you need to open the throttle. Higher throttle position = less pumping losses.