Genuine Volvo 940 Mass Air Flow Sensor

The Volvo 940 Mass Air Flow Sensor plays an appropriate role in maintaining the air fuel mix in the right proportion since it measures each gulp of the intake air and it is up to the Volvo engine computer to determine the exact length of each injector pulse. Two main sensing styles were fitted in this Volvo model family, with the early vane air flow meter being fitted on some examples of the 940 and the more recent hot wire unit being added in as modifications increased efficiency, though both are aimed at achieving the same goal, that of giving the Volvo control unit accurate information on mass based airflow data to control the throttle without either running too rich or too lean. The vane version uses a spring-loaded flap that rotates with the inflow of the stream, the location of which changes the signal to a potentiometer, but despite being simple, it restricts intake, can become stuck when the door is coated with dirt and is prone to wear due to containing moving parts. The hot wire type of Mass Air Flow Sensor uses a thin wire in the airway and then measures the electricity needed to maintain that wire at a desired temperature; additional flow increases the amount of heat dissipated thus resulting in an increase of current, and the computer converts this into a figure of airflow; it provides quicker response and less resistance to breathing, but oil mist or dust may coat the wire. A dirty Mass Air Flow Sensor normally causes hesitation, stalling, a lean or rich mixture and a lit check engine light; hence ensuring that the air track is sealed and the sensor element is free of problems can ensure that all Volvos breathe properly and provide damage-free power.

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