Quote Originally Posted by slimguns View Post
So, this is what I thought and puts me back to square one. I thought the engine would run rich with a MAF failure (or disconnect). Right now, MAF disconnected, LTFT running positive 2-5 at idle and up to 9-10 with moderate driving. Using "Jerry's handbook" VE tune methodology I thought I would be getting negative numbers and trying to lock those down between 0 and -3 when PE mode kicks in.

With the LTFT so far in the positive, how do I flip that around? Please show me if a better tuning (DHP) guide if one exist but I have been using Jerry's guide for my NA motor until the parts are on order and ready to swap. TIA
I have ssaid many times the "handbook" is complete and utter bullcrap and should be burned, as there is no accurate information in there.


Also, "trims" reflect air temperature when the maf is unplugged, it doesnt read the O2 sensor at all, it effectively goes into open loop.
the LTFT number is just the PCM's thoughts on how to compensate for air temperature based on your IAT reading... Trying to tune any VE table (which is never used when the maf is plugged in btw) is stupid as hell in general, even dumber trying to do it using the LTFT value as it is not reflecting anything other than what the air temperature is reading.