What are the reasons for sudden heavy smoke from the engine?
1 Answers
Automobile engine smoke can be divided into three types: white smoke, black smoke, and blue smoke (taking diesel vehicles as an example). White smoke: Generally, if white smoke still appears when the car engine is in a hot state, there may be two situations: the fuel injection advance angle is too small, causing incomplete combustion; slight water leakage in the cylinder liner or water in the fuel. White smoke during cold starts, especially during low-temperature starts, which disappears as the engine temperature rises, is a normal phenomenon. Black smoke: Black smoke from a car engine may occur under the following circumstances: air-fuel ratio imbalance; decreased cylinder pressure; excessively early fuel injection (too large fuel injection advance angle) can cause black smoke; failure of the smoke limiter on the fuel injection pump can also result in black smoke during rapid acceleration; malfunction of the exhaust brake system. If there is severe black smoke, other issues should also be considered. Blue smoke: Blue smoke from a car engine is often caused by "burning engine oil." In this case, check whether the engine cylinder liner is worn, whether there is "sticking rings," ring misalignment, aging or deformation of the valve seal rings, excessive valve guide clearance, etc. At the same time, this is often accompanied by crankcase blow-by. Severe oil discharge from the turbocharger can also cause some engine oil to enter the cylinder through the intake tract, resulting in "blue smoke discharge." Therefore, during routine maintenance, the oil discharge situation of the turbocharger should be checked, and the engine oil in the connecting pipeline from the turbocharger to the intercooler should be cleaned in a timely manner.
