My main question is, why are fuel trims always negative , both when idling and during driving ???
And STFT IS -11.5 , LTFT is -11.7 , in this range, just rises a bit during acceleration when driving etc.
So the Oxygen sensor always has reading rich condition, why is it happening ?
And in city driving fuel consumption very high, while in longer routes fuel consumption is excellent perfect... WHY this is happening ? Is it possibly DUE TO SPARK PLUGS GETTING WEAK or is there any other reason ?