I bought a used accent crdi which was burning oil... so i refurbished the engine... it was black smoke coming from exhaust.... now after refurbishment it has started to emit white smoke while in idling... and emits black smoke while driving... I have only drivien 200 km after engine work.... WHAT WOULD BE THE PROBLEM..?

 

The white smoke typically comes from coolant being burned off and black smoke typically comes from a vehicle that is running too rich. Do you have any trouble codes?

 

And blue smoke is oil being burned.

I'd suggest checking the coolant level first.

 

Have your oil seal/gasket checked. It may be broken.