What happens to the engine when the air flow sensor fails

The air flow meter is one of the most important sensors in the EFI engine control system. It is used to measure the amount of air sucked into the engine. In order to obtain the best concentration of the mixture under various operating conditions, the EFI engine must Correctly measure the amount of air sucked into the engine at each moment, as the main basis for the computer to calculate and control the amount of fuel injection. It is between the amount of intake when the engine is idle and the throttle is fully closed and the amount of intake when the vehicle is accelerating and the throttle is opened. The difference can reach more than 40 times, and the maximum flow rate of the intake airflow can reach more than 80m/s. The air flow meter should be able to accurately measure the intake air volume within these varying ranges; and during the measurement, the flow of air should not be hindered, as much as possible. May reduce intake resistance.

The common faults of air flow meters are line short circuit, open circuit or abnormal air intake signal. Its fault will make the computer unable to correctly measure the air volume sucked into the engine, so that the fuel injection volume control can not be carried out normally, causing the mixture to be too thick. Or too thin, causing the engine to run abnormally.

The air flow meter is a high-precision component. In the process of maintenance and disassembly, you should be careful, avoid collisions, do not let dirt enter the flowmeter, and do not arbitrarily put tools or fingers into the flowmeter to avoid damage There are many types of air flow meters, and their structural principles are very different, so the maintenance methods are also different.

Post time: Nov-15-2021