Re: Air Temp Sensor
Before people developed the ability to modify the calibration, changes were made to "fool" the ECM. Mid America sold TPS module that made the ECM think there was more throttle than actual, allowing you to go into PE mode sooner. Moving the MAT so that it was an IAT was another of these tricks. They tend to richer the fuel mixture. Converting the MAT into an IAT normalizes or makes the ECM input more consistent since the sensor is further isolated from the motor and the air temp stays more consistent. it doesn't vary as much due to heat soak and coolant temp ups and downs.
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