Hesitation and jerking during acceleration.The engine hesitates or drags while under load or idle.The engine stalls shortly after starting.The engine is very hard to start or turn over.Here are some of the most common symptoms of a faulty mass airflow sensor: Symptoms of a Faulty Mass Air Flow SensorĪ faulty mass airflow sensor will cause problems similar to low compression or low vacuum, and will also show symptoms similar to when your vehicle has low fuel pressure from a faulty fuel pump. When a vehicle’s mass airflow sensor is faulty or defective it can cause a variety of problems, and usually results in very poor performance from your engine. The air mass information is necessary for the ECU to correctly balance and deliver the correct amount of fuel to the engine.
A mass airflow sensor (MAS) determines the mass of air entering a vehicle’s fuel injection engine, and passes that data to the Engine Control Unit, or ECU.
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