Quote:
Originally Posted by California98Civic
So, ever since installing the new WAI and getting markedly higher 40-50 degrees over ambient temps on the intake sensor, I have noticed long term fuel trim greatly leaned-out, as in this photo. I also think I can feel less power in certain routine situations. Oddly, conventional wisdom here has been that the ECU will keep stoich and that gains come from reduced pumping losses. I still think the pumping losses idea makes sense, but my UG is telling me I am running far leaner than I used to. Normally, this long term fuel trim would read +0.78, now it generally reads -6.2 and leaner.
Why, do you think? |
Warmer air is less dense = less fuel to bring it to 14:1 afr, as a result, less power due to less fuel consumption. That's why cold air intakes give more power. Colder air = more dense = more fuel to keep it at 14:1, as a result, more power due to more fuel consumption.
[Edit]: Why is your engine temp at 122F?