yobabiesdaddy2001

iTrader: (20)

After a Ve tune does the ltfts still keep learning? I ask because all of my stft are close to 0 within = or - 5%, but the LtFts are like 15 14 or so.

txhorns281

iTrader: (12)

LTFTs are built off STFT corrections. As the LTFT moves closer to it's learned value, the STFT correction will be less active (hence why it tends to settle around 0), unless you are excessively rich or lean. The LTFT stays at it's learned value until the PCM detects a change in A/F production. The immediate response is to employ STFT corrections until the LTFT value can update.

Sounds like your VE isn't so hot

chrisj6

Hey Len, are you resetting the fuel trims when you make changes? Send me some logs if you have any, I wanna see what you got.

yobabiesdaddy2001

iTrader: (20)

chris send e a email where i can send you a couple of files. I have came a long way!

yobabiesdaddy2001

iTrader: (20)

How often do you need to reset the Fuel trims, I assuming by this everytime I start to log the short and long trims

txhorns281

iTrader: (12)

Even if you don't reset fuel trims, given a 10 minute drive time, you will still notice all fuel trims updating unless your correction was not of any significance. Fuel trims learn pretty quickly, resetting simply allows the adaptive process to start from ground zero.