What Causes Pungent White Smoke from Exhaust?

[MacDakota]

Reasons for pungent white smoke from exhaust: 1. The vehicle's air filter is contaminated, causing insufficient air intake; 2. The carburetor is malfunctioning, or the oxygen sensor in the exhaust pipe is contaminated, preventing the computer from providing correct air-fuel mixture information; 3. The engine's piston is damaged and burning engine oil; 4. Excessive water content in gasoline. It is recommended to clean the throttle body and check for leaks at the junction of the cylinder head and gasket. If leaks are found, it can be determined as caused by a damaged cylinder gasket. White smoke during cold starts that disappears as the engine warms up is normal, as it results from complete combustion in the engine and hot steam encountering cold air.