What is the reason for black smoke from the Geely King Kong exhaust pipe with an overly rich air-fuel mixture?
2 Answers
Black smoke from the Geely King Kong exhaust pipe is due to incomplete combustion of the air-fuel mixture. Black smoke occurs because of incomplete combustion of the air-fuel mixture: When there is insufficient air intake and excessive fuel, the engine's combustion process becomes incomplete. Gasoline does not burn completely, forming a large amount of carbon particles under high temperatures, which results in black smoke being emitted. The exhaust pipe can emit smoke of different colors: When starting the car in winter, due to the low external temperature, water vapor produced after engine combustion turns into white smoke when emitted. If the car has a malfunction, blue smoke appears when engine oil enters the combustion chamber and participates in the combustion process.
I've been repairing cars for over a decade and have encountered many Geely KingKong models emitting black smoke. Upon inspection, it's usually caused by an overly rich air-fuel mixture with excessive fuel combustion. The most common issues are fuel injector leaks or blockages. When they age, the fuel spray becomes uneven, and improper ECU control leads to excessive fuel and insufficient air. Another cause is a completely clogged air filter preventing proper air intake, disrupting the ratio and resulting in black smoke. A faulty oxygen sensor is also critical—it monitors exhaust oxygen levels, and incorrect data can mislead the ECU into injecting too much fuel. If the coolant temperature sensor malfunctions, the system may think the engine is cold-starting and increase fuel injection, which is another reason for smoke. I recommend owners first check their air filter and replace it if dirty. If that doesn't help, take it to a shop to read fault codes and inspect the injectors and sensors. Don't delay, as this can lead to skyrocketing fuel consumption or severe engine carbon buildup.
