What happens to the engine when the air flow sensor fails?

Air flowmeter is one of the most important sensors in the control system of EFI engine, which is used to measure the intake air of the engine. In order to obtain the best mixture concentration under various working conditions, the EFI engine must correctly measure the intake air entering the engine at each moment as the main basis for computer calculation and control of fuel injection. The difference between the air intake when the engine idling throttle is fully closed and the air intake when the automobile accelerating throttle is opened can reach more than 40 times, and the maximum air intake flow can reach more than 80 m/s, and the air flow is not hindered during measurement, so as to minimize the air intake resistance.

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.

Air flowmeter is a high-precision component. During maintenance and disassembly, care should be taken not to collide, not to let dirt enter the flowmeter, and not to put tools or fingers into the flowmeter at will to avoid damage. There are many kinds of air flow meters, and their structural principles are quite different, and their maintenance methods are also different.