What Causes Smoke from the Car Hood?

[LaylaLee]

Smoke from the car hood may be caused by engine overheating. The specific reasons for different colors of smoke from the car hood are analyzed as follows: White smoke: caused by a small injection advance angle leading to incomplete combustion; slight water leakage in the cylinder liner or water in the fuel may also cause white smoke. Black smoke: caused by an imbalance in the air-fuel ratio; a drop in cylinder pressure; premature injection timing can cause black smoke; failure of the smoke limiter on the fuel injection pump can also cause black smoke during sudden acceleration. Blue smoke: often caused by burning engine oil. In this case, check for wear in the engine cylinder liner, piston ring misalignment, aging or deformation of the valve seals, etc., which is usually accompanied by crankcase blow-by.