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Message: [QUOTE="Long Gone, post: 1528675, member: 31343"] Oh , but if it were only that easy for me...(nothing is ever easy that is worth doing..) I've worked a bit with thermocouples in industry as an industrial electrician most of it type J some K and others, who knows what type the MAT is really. In the IH literature I've found what they are calling the IA2 (Intake Air Temp2). It says that "when the temperature decreases the resistance of the thermister increases. This causes the signal voltage to increase" It doesn't say if inverse or proportional to temp though. Type J and K go high in all the applications I've ever seen. My sensor was plugged in and still reading -40 on the MAT scangauge2. I unplugged it and it goes to 419. plugged and unplugged several times and it was consistent. Starting the truck with it unplugged and reading 419 led to the same problem as at the -40 reading. Ran ok initially for about 10 seconds and then high RPMs (1100). Not sure what is going on here but since the reading is so off I have to think the sensor is not good, possibly shorting to ground. Not sure this is the root of the problem though. I am really wondering why the check engine light hasn't illuminated through all of this. Especially since the IH literature says "if the PCM recognizes that the IA2 signal is higher or lower than the expected value it will set a Diagnostic Trouble Code (DTC) and illuminate the amber malfunction indicator lamp on the dash" No codes no check engine light. [/QUOTE]

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