sorry being newbie actually dont know much about cars, i only know how to use it

my sportivo is lately seeing lots of white smoke every time i start at cold start and when in 1st-2nd gear. dati hindi naman sya ganon ka usok and medyo lumalakas na ang vibration ng engine. im riding a 2005 sportivo wit 46k km.
nagpachange oil na rin ako and napalitan na rin yung fuel filter and oil filter, pero ganon parin, sabi need ko mag pa calibration na. ano kaya ang problema and san maganda check/magpagawa?