I just got a interceptor gauge and was veiwing my fuel trims

Short is norm around -3 to 6
Long is between 12-19.5

I kno this isnt right lol all i got is a airbox mod what should i look for? I know when long trim goes above 20 it tgrows the p0171 cel
Whats tge nirmal sussposed to be for long and short trims, apologize about spellin im on my phone haha tganks in advance

 

is it bouncing around rapidly?

should be closest to 0, but airbox mod shouldn't do it that bad.

 

The short bounces rapidly but at idle LTFT stays at 19.5 and while driving shoots between 12-19.5 hmm idk im lost lol

 

I believe postive is lean and negative is rich.. are you throwing a code? If not idk.

 

Ive been throwing the p0171 which is fuel trims are lean but it will go away after a while but normally i just clear it, comes back ploberly 70 miles later.

 

Look up what a long term fuel trim is, then look up what a short term fuel trim is. Your tune is off, a lot. Get a new tune.

Are you in lincoln park chicago?

Are you in lincoln park chicago?

 

lincoln park michigan, ive never had a tune its just the stock GM tune i beleive idk bought the car at 48k miles..i think i may have a air leak at the elbow of the plastic peaice of the air box so air is getting in pass the MAF sensor which would throw it off? or could i be way off with that?

 

Now im tgrowing p0300 engine misfire ima buy. New plugs...
Also im idleing with the ac on and my ltft is at 13.2

 

now ive heard many different comments on this.. now its possible the owner before didnt let them set correctly. dont quote me but from what ive seen/heard it takes usually 3 start ups and cool downs (aprox 50 - 100 miles) for the ecu to get the correct trims. and at WOT it should lock at 0. and during the learning process you cannot go WOT. but.. thats what ive read. i not 100% sure.

 

Ill try that but it started doing this after the airbox mod but i just got my gauge so idk where the trims where before that