Yesterday we had our first hot day of the year (90F) and I had the C5 out for a bit.
I thought I had my VE table dialed in pretty well in the idle and "light cruise" sections of the map until after about 45 minutes of stop and go in the heat, the AFRs started getting very lean in these same regions (~17.5-18).
I had previously done all my tuning in these areas when ambient temp was around 70F.
- Isn't the PCM supposed to be taking IAT into account for these fueling calculations?
- Do I just need to make these sections richer and let the STFT and LTFT do their thing when I re-enable them?
- Will this remedy itself when I re-enable the MAF for the low end?
- Is there something else I can adjust to help with this? (Hotsoak Enrichment?)
This post #12 looks like it might be on to something. Maybe the IAT is more heat-soaked than the engine and pulling fuel when it shouldn't be.
https://forum.hptuners.com/showthrea...l=1#post290311