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Air flow meter is an integral component found on most modern vehicle’s electronic fuel injection system. It is located between the air filter and the intake manifold of the engine in a plastic housing. The AF meter is used to measure the amount of air flowing into the vehicle’s intake. It also delivers the air mass information required for the ECU to control the operations and deliver the correct fuel mass to the engine.
A damaged air flow meter will cause rough idling and loss of efficiency. In vehicles, mainly two common types of air flow meters are used, the hot wire and the vane meter.
The hot-wire meter is mounted directly in an air intake system in the form of a heated thin wire. Vane meters consist of a spring-loaded paddle in the engine's air intake. Both types of air flow meters are sensitive electronic sensors. They require inspection and cleaning once in a while with electronic contact cleaner. Dirty air flow sensors will decrease your fuel mileage and may shorten the lifespan of your engine.
To run efficiently, engines require a precisely controlled mixture of air and fuel, and spark timing. In this process, the Air flow meter plays an important part.
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