Testing mass air flow sensor?

Car not starting properly ,car has slow accelarations,car bogs down,low gas mileage, shuddering, stalling, knocking or pinging,low rpm,car sputtering etc etc are basically indication of bad MAF sensor.MAF is mechanic short hand for a Mass Air Flow sensor. It measures the amount of air entering the engine. It is located between the air cleaner box and the throttle body. It usually is either clamped into the rubber tube which connects these parts or bolted to the air cleaner top housing. It will have an electrical connector attached to it. To do proper testing requires a professional computer scan tool.
Two "poor man" tests can be done. First test is to tap lightly on the MAF while the engine is idling [engine must be warmed up aka at operating temperature] If the engine stumbles or the idle changes when the MAF is tapped on, it is bad. Another check is to shut the engine off [key off] and disconnect the wiring connector to the MAF. This will cause the engine computer to go into "limp home" mode. This is the computer's response to a failed major sensor. If the engine now runs better, the MAF is probably bad. FYI, the MAF can fail in a number of ways which will not give a fault code. Often, the best test is to substitute a MAF from another car [same year, make, model & engine] that is running normally.

This details will help.Thanks.

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