Ok so i threw some codes.....a p0135 and a p0130. I have a boosted ecotec and my a/f ratios are really low all the time like in the 11's and 13's just cruising. Im not sure if a bad 02 sensor will cause me to run rich while not under boost cause my numbers in boost are fine. Anys ideas would be helpful.
I would guess you got a problem with youre upstream O2 sensor, Its more likely wornout.
