Quote:
Originally Posted by Jeremy
I cannot locate my IAT sensor on my 95 jimmy. Can anyone help with a picture or anything, please
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The Intake Air Temperature (IAT) sensor detects the temperature of the incoming air stream in a car machine. The IAT sensor resistance changes in response to the intake air temperature. The AIT is usually located in an intake air passage which is connected to the THA terminal on the ECM, it is used for detecting ambient temperature on a cold start and intake air temperature as the engine heats up the incoming air. The sensor resistance decreases as the surrounding air temperature increases. This provides a signal to the PCM, indicating the temperature of the incoming air charge.
Located: Under hood, center, upper engine area, mounted in front of air intake duct. Good luck and hope this helps.
If your planing to add a IAT resistor, don't wast your time. It does nothing but fouls up your spark plugs.
This sensor send to the ECU a signal in form of voltage. The theory is that installing a resistor instead the sensor the ECU will "think" that the temperature is constant, and colder, and it will inject more gasoline to compasate the colder (and higher density) charge of air. Unfortunately you have a thing called a O2 sensor which will tell the computer to lean it out even if the air temp is cold/rich.
Well the O2 does tell the ecu it is lean or rich by a voltage. What I was going for was the ECU would figure in the cooler air temps and remap the fuel back to 14.7 or should I say either side of 14.7:1. Its actually the other way around, which was what I was trying to say. Thats why youll notice rich conditions during startup, cold weather, etc. Its usually correction via 02 feedback, then when you go into the higher rpms, the ECU doesnt even take info from the 02, instead it just delivers whatever the fuel maps say and its modifiy by whatever multipliers(Map Sensor).
02-02-2010, 10:36 PM
IAT sensor on a 95 gmc jimmy?
