Automobile air flowmeter has poor appearance.

Idle shivering, increased fuel consumption, weak acceleration, and black smoke from tail gas.

Common faults of air flowmeter include short circuit, open circuit or abnormal intake signal. Its failure will make the computer unable to measure the intake air into the engine correctly, thus unable to control the fuel injection normally, resulting in the mixture being too rich or too lean, which will make the engine run abnormally.

In order to obtain the best mixture concentration under various working conditions, the electronically controlled gasoline injection engine must correctly measure the intake air entering the engine at each moment, which is the main basis for ECU to calculate (control) the fuel injection quantity. If the air flow sensor or circuit fails, the ECU can't get the correct intake signal, so it can't control the fuel injection normally.

Extended data

Fault diagnosis and treatment of air flowmeter

Judge the cause first, and check the data of engine air flowmeter, which is out of range. High fuel consumption, weak acceleration and black smoke from the exhaust pipe. According to the data flow and fault phenomenon, the fault of air flowmeter is judged.

When accelerating, the fuel injection pulse width increases, but the air flow basically does not increase, and the air-fuel ratio is inappropriate, so the acceleration is inevitable.

Solution: Replace the air flow meter, clean the throttle body and replace the original air filter.

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