What Causes Excessive White Exhaust Smoke?

[KimberlyLynn]

There are several reasons for a car emitting large amounts of white exhaust smoke: 1. White oil mist: The main reason for milky white oil mist being emitted from the exhaust pipe is poor fuel vaporization, where unburned fuel exits through the exhaust pipe, forming milky white smoke. This is more common when starting the engine in winter due to low temperatures causing poor fuel atomization. Typically, this disappears as the engine warms up after starting. If black smoke appears from the exhaust pipe after the engine has warmed up, it indicates low cylinder pressure or a non-functioning cylinder, which should be checked and addressed. 2. Water vapor white smoke: The main reason for large amounts of water vapor white smoke being emitted from the exhaust pipe, with water droplets at the exhaust pipe outlet, is water vapor formed from coolant entering the cylinder or water content in the gasoline. Check whether the cylinder gasket is damaged, whether the cylinder block has cracks, and whether the cylinder sleeve sealing ring is in good condition.