ITs the first one will.

Didn't want anyone to musunderstand Fuel mileage will go WAY down, and you'll foul plugs. (as well as set an SES light).

hey Will are you talkin bad fuel mileage, foulin plugs, and ses light if you remove the iat sensor?? cause when i put my intake on in december i put the iat sensor in and the fuel mileage sucked @$$ but i thought the ecu might adjust itself after a few days.....nope, a week and a half later and its still munchin the gas, so i unhooked the iat sensor and the fuel mileage went up and its still unpluged now..... if i plug the iat back in will i need a mini afc 2.0 to lean it back out to get good fuel mileaga again?

u might of damaged the sensor when u took it out. Also make sure that when u put it back in, which u will need to deffinately do, that it is air tight on ur air intake.

If the IAT is disconnected, the PCM will default to a certain value and 'assume' this is correct. Depending on the actual outside air temp, your PCM will be running rich or lean. You'll very rarely ever get the right AFR. This can foul plugs, kill O2'*, kill your cat, etc. The IAT works in concert with the TPS, MAF, and O2 sensors to determine the correct amount of fuel to deliver. If you kill one of the three, you are going to lose efficiency and power......but in different conditions, depending on which sensor is missing.

Make sense?

It'* difficult to mess up an IAT, unless it is physically broken. It'* just an element that changes resistance with temperature. The computer reads the voltage across, and translates into a temp.