i av a 1995 toyota camry%2C which had engine problem and i changed the engine%2C but since when i av changed it%2Cthe early morning startr up white coloured steam has stopped%2C pls what is the cause or solut

If you meant that white steam has "stopped", since the engine change then that's good. If you meant that the steam has just started, well that's not so good. White steam coming out of the exhaust usually means you have a bad head gasket. Keep an eye on your oil. If it turns milky it means you have coolant leaking into your oil as well. Not sure where you live, but if you live in the north, the white steam could just be an illusion because of the colder temperature. I am assuming that you were talking about a white steamy exhaust. If not, please describe where exactly you are seeing white steam............