What Causes a Car to Emit Large Amounts of White Smoke During Cold Start?

[WyattFitz]

It is quite common to see white smoke from a car during winter, as the white smoke observed is essentially water vapor. The reasons for a car emitting large amounts of white smoke during cold start are as follows: 1. Delayed Fuel Injection Timing: Due to late fuel injection, the cylinder temperature has already dropped by the time the fuel is injected, causing some diesel to remain unburned and turn into oil vapor, resulting in white smoke. 2. Poor Fuel Injector Atomization: This leads to incomplete combustion of diesel, which mixes with the high-temperature exhaust gases from normally functioning cylinders in the exhaust pipe, causing white smoke. 3. Low Cylinder Pressure: Wear on valves, piston rings, or cylinder liners can cause insufficient compression pressure, allowing some diesel to turn into oil vapor without being burned, thus emitting white smoke from the exhaust pipe.