[Mario_Marques]

cfg83 my english is not good, it seems to me, in your teste, the trick it's not the iat but the real temperature?
Do you have any software to teste lambda values and ignition and injection timing?
It's possible to see what changes when you change iat value, because i think your ecu will pick other values to adjust mixture, maybe lambda value.
In my case my car uses maf value, water temp and fuel temp, for example, if i want to inject more fuel i will cheat the diesel temperature sensor(tell it that the fuel is very hot), so it will inject more(injection time will be bigger), but if my maf is reading to much air also teh quantity in that time will be big; crossed information in ecu.