If your car eating oil & see white smoke then engine needs overhaul, matter of missing there's some sensor problem of air located in air cleaner box canbe see when remove it from engine its need to be cleaning, carefuly with good carb cleaner other sensor is located in throttle body,shud b clean also, do'nt be fool from mechanics, experianced same problem in my Vitz, solved problem by myself, where u live in lahore, my cell is 0321-4144606.