Does the engine emit black smoke?

If the gasoline engine emits black smoke, it means that the working state of the engine is wrong, which means that the load situation does not match the actual fuel injection quantity, so it causes black smoke; The main reason is nothing more than this 10 common fault:

First, the air filter is blocked.

Second, the fault of the fuel injector, such as poor atomization and high injection pressure;

Third, fuel system failure, such as common oil return pipe blockage or excessive oil supply.

Fourthly, excessive carbon deposition in the ignition system and poor flash performance of the spark plug affect the combustion quality of gasoline;

The fifth is the quality problem of the throttle valve, which leads to internal leakage due to poor sealing of the throttle valve or improper adjustment of the clearance of the throttle valve.

Sixth, the oxygen sensor is faulty, such as the open circuit of the power supply line, which makes it impossible to heat.

Seventh, there is something wrong with the air flowmeter, and the measurement error or imbalance of the air flowmeter will lead to black smoke;

The eighth is the failure of the fuel pressure regulator. If the vacuum hose of the regulator is damaged or blocked, the fuel pressure will be too high.

Ninth, the coolant temperature sensor is faulty and cannot provide the coolant temperature correctly;

Tenth, the grounding wire is poorly grounded, and the oxygen sensor signal wire is screwed with the shielding grounding.