Get troubleshooting help for mass airflow sensors from AirTex Fuel Delivery Systems or Cars Direct. Both companies' websites illustrate common symptoms of faulty mass airflow sensor operation and show users how to clean, dry and reinstall sensors.
Some of the most common symptoms of a faulty mass airflow sensor include an engine that stalls immediately after starting, an engine that hesitates or drags when under load or when idling, an engine that jerks and hesitates during acceleration and occasional engine hiccups. Additionally, engines that display unusually rich or clean idling may have faulty sensors.
To get the longest life and most productivity out of a mass airflow sensor, clean it every time the vehicle's oil gets changed or every six months. To clean this device, open the air box of the vehicle, and pull it out using a flat-head screwdriver. Make sure not to accidentally break the delicate wires connecting to the sensor, as they are expensive to replace. Clean the sensor either with rubbing alcohol or with specialty sensor cleaner by placing it in a small plastic bag with the cleaning fluid inside and lightly shaking the bag so that any contaminants located on the sensor wipe off. After this, let the sensor sit for 20 minutes, and then reinstall it once dry.