What Causes White Smoke from Diesel Engines?

[OFrancisco]

Here are the reasons why diesel engines emit white smoke: 1. Low engine temperature: If white smoke appears during startup in winter, it is usually due to the engine temperature being too low and not yet reaching optimal operating conditions; 2. Water in the fuel supply system: If you place your hand behind the exhaust pipe and water droplets form on your hand when white smoke passes over it, this indicates the presence of water in the fuel supply system; 3. Low air pressure in the engine cylinders: If the engine emits white smoke at low temperatures and black smoke when warmed up, it suggests that the air pressure in the cylinders is too low; 4. Low fuel injection system pressure: If the engine emits grayish-white smoke and the vehicle lacks power during acceleration after startup, this indicates that the fuel injection system pressure is too low.