Jerking– As you go down the road, you’ll feel your Sonic really jerk and hesitate as the engine speed changes erratically.And when it does, it doesn’t usually run very well. Hard to Start– Without knowing the proper amount of air entering into the intake, it can be really difficult for the engine to start.The exhaust color usually doesn’t change. A lean condition is when there is too much air relative to fuel in the air fuel mixture. The exhaust color is usually darker when running rich. A rich condition is when there is not enough air relative to the fuel in the air/fuel mixture.

Idle Issues– Your Sonic may run rich or lean when idling, or it may also idle erratically.

Here are the most common symptoms of a bad or failing MAF sensor: When the mass airflow sensor has gone bad, you’ll definitely feel it.

And, most of the time they are right by the air box and easy to replace.įaulty Mass Airflow Sensor Symptoms: Chevy Sonic If you do determine that you need a new mass airflow sensor, they aren’t too expensive. The ECU uses this information along with other sensor data to control the amount of fuel that enters the combustion chamber. It passes this information onto your Sonic’s ECU. A bad mass airflow sensor can leave your Chevy Sonic’s engine running rough, or even inoperable.Ī MAF sensor measures the density of the air entering the intake manifold. The mass airflow sensor (commonly abbreviated to MAF) is one of the most important engine management sensors.

Sl55 mass air flow sensor problems