I have been talking about my P1688 in another thread when someone mentioned after seeing my freeze frame that i have a LTFT 7%, why is that good or bad? also asked if i had any mods. I have everything stock. here is my freeze frame again, if someone with greater knowledge can explain pls. I am totally a dum *** when it comes to technical issues.

 

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It means long term fuel trim, and that is the "rough" tune the car uses for cold starts, before the closed loop feedback starts varying the STFT.

7% seems fairly normal, mine was reading 30% when I had a small vacuum leak.

S

 

Yeah, up to 12% is OK.
22% or more is bad.
Anything inbetween can be interpreted differently depending on its affect on the car's drivability.
30% is as far as the PCM can go.

 

wow...

i get wigged out when mine gets up around 6.6 the norm for me is 1.6 or 2.3

i can get to the 6.6 when i beat the crap out of it...

beers

 

I like trim....

 

i like trimmed.

beers