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You're going to have a hard time "fooling" a diesel computer into running a leaner mix - at least based on intake air temp.
The whole reason why your gas engine pulls fuel is in order to cool things off in the combustion chamber and prevent precombustion that a "hot mix" could be succeptible to. Um, precombustion isn't an issue in diesels. Forget about it.
Plus, why would you ever want to intake warmer air on a TURBOCHARGED AND INTERCOOLED engine? By the time you go through all that processing, you're not going to affect precharge air temperature anyway.
By the way, most gas engines NOT ONLY pull fuel when they see high intake temps, but they will also pull out timing. Um, power and efficiency (power per fuel) go down when this happens. It will vary in magnitude from computer to computer, but you're trying to convince your computer to use less gas. In the end, the computer will correct based on O2 sensor readings. I'm pretty convinced warm air is a placebo effect. Didn't work on my vehicle.
If you better understand what goes on inside your computer, you can better understand what to do outside. Warm air does not make a combustion process more efficient. It makes it worse. Maybe your computer does something funny, but the basics of Carnot/Rankine cycle dictate that a cooler charge/sink temp is more efficient at harvesting the heat energy from the source. Always.
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