So I'm troubleshooting my car and I am trying to figure out what I should be seeing on a scan tool. I saw two seperate IAT readings on the scan tool, one read about 4 degrees celsius (39ish fahrenheit), which is just about the ambient temp today. The other number I saw was 82 celsius, which I think translates into like 179 degrees fahrenheit? How is this even possible? I have a feeling I found my problem with my car running like garbage.

So what should I be seeing compared to ambient? Considering I'm not beating the car. Thanks!!

 

The higher number is coolant temperature and the lower one is the air temperature.

 

Hmmm. That would make sense but they were both clearly labeled "intake air temperature" on the scan tool. Hmmm.

 

There is only one IAT sensor on a stock Evo engine afaik

 

Yeah and its built into the MAF I believe.
Still seeing two temps, one ambient, and one showing what seems to be pretty consistant with coolant temp (82/83 degrees C). Interesting.

Regardless, the code I was throwing was because the MAF was unplugged at one point while the car was being worked on, so I am back to square one. However I did notice a decent amount of pressure in the valve cover last night when I unscrewed the oil cap at idle, I could feel a pretty good thumping of air coming out of the cap. I will be checking the PCV as soon as I can, as well as the hose that vents from the front corner of the crankcase to the intake pipe.

The car did use maybe a half quart of oil in 2700 miles, but I would almost call that normal for a turbo car with 100k on the clock. Just exhibiting horrible low speed and low load throttle response.