Join Date: Mar 2007
Location: Rio Grande Valley, Tx
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You can run without it, and a few have said that they saw gains (the highest I saw was 8 RWHP) but as far as exactly what it does you got me...
I BELIEVE it keeps track of the either the amount of air entering or the temperature and then accordingly changes the amount of fuel being put into the engine
The IAT sensor is there to detect the temp of the air entering the engine from the intake. The signal sent from the sensor tells the computer what timing and amount of fuel the engine needs according to the air temp itself.
It is NOT the only sensor that controls the fuel and timing, there are many others sensors, these also include the O2 sensors, MAP (manifold air pressure) sensor and many other sensors and parameters to ensure the engine works properly.
One trick is to place a resistor in line with the sensor to trick the engine to think it is colder outside, then it will change the fuel and timing, not by much and therefore the changes are not dramatic and our computers adapt them selves and readjust.
If you disconnect the sensor or add to much resistance you will end up with a code and check engine light, I have played with this and other sensors and the car ran best by leaving it as it came.
Hope this helps,
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