Engine/ECU mod ideas for mileage

[micondie]

Tweaking the air temp sensor will advance your timing even in the middle of your hot Texas summers which will give you more power from the fuel you use
thus reducing your fuel consumption. Your motor is still breathing that hot Texas air, it will just get more power from it. The ECU will adjust the mixture for that thinner hot air based on the signal from the O2 sensor.

[TheEnemy]

Originally Posted by JohnnyGrey

Here's a nice chart from Toyota:



Notice that at the very worst, NOX is 20% higher than the stock tune, which is nothing to worry about. Conceivably, since we're all driving with a light foot we're probably releasing fewer total gases than the average driver despite the 20% lean-burn NOX increase. Also notice that if you go even leaner, NOX starts to come back down to stock levels.

GM's ECUs have a "lean cruise" mode, but it's disabled in all of their US cars to comply with US law. If you multiply that 20% NOX increase out to every Escalade, Yukon, Navigator, you can see why it wouldn't be a great thing in crowded cities. However, I'm not going to let anyone make me feel bad because my modified 2.2L might be producing almost as much NOX as their stock 3.0L.

Looking at the chart and taking your 17.4 AFR it looks like your emissions are better than stock even looking at the PPM.

Edit: just realized I was responding to a 2 year old post