What Causes Smoke from the Front of a Car?
1 Answers
There are many reasons why a car emits smoke, and the issue can be identified based on the color of the smoke, such as engine overheating, decreased cylinder pressure, etc. Below are the specific details: Reasons for white smoke from the front of a car: Generally, if white smoke persists from the car engine even in a warmed-up state, it could be due to two scenarios: a small fuel injection advance angle causing incomplete combustion, or minor water leakage in the cylinder liner or water in the fuel. White smoke during a cold start, especially in low temperatures, which disappears as the engine warms up, is a normal phenomenon. Reasons for black smoke from the front of a car: An imbalanced air-fuel ratio; decreased cylinder pressure; early fuel injection timing (excessive fuel injection advance angle) can cause black smoke; failure of the smoke limiter on the fuel injection pump can also lead to black smoke during rapid acceleration; malfunctioning exhaust brake system. If severe black smoke is observed, other issues should also be considered. Reasons for blue smoke from the front of a car: Blue smoke from a car engine is often caused by "burning engine oil." In such cases, check for wear in the engine cylinder liner, "stuck piston rings," misaligned rings, aging or deformed valve seals, excessive valve guide clearance, etc., which may also be accompanied by crankcase blow-by. Severe oil discharge from the turbocharger can also cause some oil to enter the cylinder through the intake tract, resulting in "blue smoke." Therefore, during routine maintenance, the turbocharger's oil discharge should be checked, and any oil in the connecting line between the turbocharger and the intercooler should be promptly cleaned.
