Most Fuel Injected vehicles are equipped with a Mass Air Flow (MAF) Sensor to measure the air velocity which the PCM uses to determine the proper air/fuel ratio mixture. However, the MAF sensor gets dirty with debris, oil, air filter fibers, dust and pollen causing inaccurate measurements of intake air flow which results in a "rich" running engine, loss of power, and excess emissions.
Some believe that the permanent washable air filters which are oiled, overly contribute to a dirty MAF. Although this has not been my experience,
over oiling a cloth type air filter
will cause down stream contamination of the MAF.
Caution:
Never apply MAF cleaner when the MAF is energized.
Use MAF cleaner in a well ventilated area. Vapors may accumulate readily and may ignite.
Do not breath fumes. Contains Hexane Isomers, n-Hexane, and Carbon Dioxide. May cause irritation to respiratory system.
Use eye protection when spraying MAF cleaner. Avoid contact with skin.
Directions to clean MAF Sensor.
1) Turn off vehicle.
2) Locate your MAF. It should be between your air filter housing and throttle body.
3) Unplug MAF wire harness.
4) Remove MAF assembly from vehicle.
5) Place MAF on shop towel or cardboard to catch any run off.
6) Apply 10-15 short sprays MAF cleaner onto the exposed sensor wires, or sensor plate.
7) Do not touch the sensor wires or sensor plate with any object.
8) Clean all sides of the MAF, and clean the wire connections also.
9) Allow the MAF to dry for 2-3 minutes before reassembly to the vehicle.
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Originally Posted by RickMN
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The MAF has a thin wire that heats up. The air rushing past it cools it. The PCM
measures how much current it takes to keep the wire at a constant temperature. Some MAFs have a temp sensor. Once the computer knows the outside temp and the "wind chill" it can determine the density of the air. It uses air density to calculate how much fuel to deliver.
Rick
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Linear Mode
