Mass Air Flow Meter (Tech Tip)

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MASS Air Flow Meter (MAF): There is few different kind of Mass Air Flow Meter on the market; most common is Hot-Wire sensors. It uses small electrical current to heat a wire and resistor assembly in the intake air stream. Variation in the intake air flow will cause the amperage of the current to vary according to the cooing effects of the air flowing past the heated wire – resistor. The MAF then converts the variable amperage value into a variable voltage or frequency value that is sent to the ECM (engine control module) to indicate the grams per second of air flowing in to the engine. This determination is the basis for pulse width (amount of fuel) calculation to the fuel injector.



The most caused MAF failures are dirt, oil contamination and air filters often shed pager fibers that accumulate on the heated wire and resistor assembly, etc.
Important: Recommend use specially formulated MAF sensor cleaner. Using carburetor cleaner or other harsh solvent will destroy the sensitivity of the sensor.
The most caused MAF failures are dirt, oil contamination and air filters often shed pager fibers that accumulate on the heated wire and resistor assembly, etc. Important: Recommend use specially formulated MAF sensor cleaner. Using carburetor cleaner or other harsh solvent will destroy the sensitivity of the sensor.