My 2002 Toyota Camery 4 cylinder with 77,000 miles emits a rather large cloud of greyish white smoke at or a few seconds after staring the engine, after it has sat a few hours. It is very noticable starting the engine in the morning and after work. I back out of the driveway through a cloud of smoke. Otherwise, the engine seems to run fine with no leaks found on the driveway, and no sign that it overheats after running a while. I live in a hot and humid climate, so there is a lot of water on the driveway after coming home from work. Also I've noticed the AC compressor or AC component seems to make a small rattling noise when the car is idleing. Like maybe a bearing problem. It seems to rattle whey the return air is on and the compressor? cycles on and off. Not sure if this has anything to do with the smoke.