Posts Tagged: white smoke from exhaust

White smoke from exhaust, what it means and when it’s bad

White smoke coming from the exhaust: Does it always indicate a head gasket problem? White smoke from exhaust on cold startup is usually not a problem. When you start a cold engine, the computer commands a rich fuel mixture. The exhaust produced from a cold engine and rich fuel mixture produces a lot of hot water vapor. As soon as that hot water vapor enters the cold air, it condenses, forming thin white smoke. It’s not really smoke. In fact, it’s like a very thin mist of white vapor. If … Read More