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Discussion Starter #1
I have an 09 GT with long tubes. It’s throwing lean codes. I replaced the MAF. Didn’t work. I bought a bama tuner, through rich codes and several other codes. I turned it back to the stock tune. Should I get a professional shop tune? Thanks!
 

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why did you replace the maf?

did this occur only with the long tube install?

you need to log the rail pressure, fuel pump duty cycle, lambse1 and 2, kamrf1 and 2, iego1 and 2, then run it just under half throttle so it stays in closed loop on the interstate in 2nd gear up to 6k rpm or so to see if its in fact running lean

it could very well be just the long tubes screwing with the o2s or even a bad o2
 

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Discussion Starter #3
I replaced the Maf because I figured the hesitation was from a bad maf. I bought the car with the long tubes already on it.
 
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