3 Signs Of A Failing Mass Air Flow Sensor

A Mass Air Flow Sensor (MAF Sensor) is a vital part of an electronic fuel injection system in your car. It is located between the air filter and the intake manifold of the engine. The mass air flow sensor measures the amount of air entering the engine or the air flow.
There are few types of air flow sensors, and the most common type is a “hot-wire” MAF sensor. This type of sensor measures the amount of current necessary to maintain the temperature of a wire above 90 degrees, which in turn gives your car’s computer a measure of the mass of the air entering the engine. The PCM uses the airflow signal to calculate how much fuel to inject, keeping your MAF sensor running correctly.

Here are some of the most common symptoms of a failing mass air flow sensor:

1. Engine runs lean or rich

If your car’s computer is receiving inaccurate information from the MAF sensor (for example, due to deformation of the wire, or damage to the electrical equipment), then your engine will run consistently lean or rich. It can be noticeable on your fuel economy if there are no other problems with your engine control system. Sometimes it can be fixed only with the MAF sensor replacement , but sometimes you will need to replace the associated electronics or the entire engine control system.

2. Your Engine Runs Lean When Working, or Rich When Idling

Your MAF reports to your car’s computer information about the air which is used in your engine’s combustion chamber. The wire can get dirty due to oil or dust. If the wire is dirty, your MAF sensor will send an inaccurate reading and your engine will run lean when working, and rich when idling. If you noticed these issues, then your wire can be insulated. You can fix this problem by cleaning the hot wire.

3. Stalling or rough idling

Your car’s computer won’t be able to control the airflow information accurately if the MAF sensor fails completely. Take your vehicle to your trusted mechanic to replace the MAF sensor.


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