1995 Toyota 4Runner airflow mass moduel ithink that is what

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1995 Toyota 4Runner 6 cyl Two Wheel Drive Automatic 169000 miles

what are the simptoms or what does this airflow mass moduel do. The truck hesitates when the speed reaches 40 will loose power and like it slows.

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Tuesday, August 5th, 2008 AT 10:38 PM

1 Reply

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Your problem could also be caused by fuel pressure problem, throttle position sensor.

A mass airflow sensor is used to find out the mass of air entering an fuel-injected engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Air changes its density as it expands and contracts with temperature and pressure. In automotive applications, air density varies with the ambient temperature and altitude, and this is an ideal application for a mass sensor. (See stoichiometry and ideal gas law.)

There are two common types of mass airflow sensors in usage on gasoline engines. These are the vane meter and the hot wire. Neither design employs technology that measures air mass directly. However, with an additional sensor or two, the engine's air mass flow rate can be accurately determined.

Both approaches are used almost exclusively on electronic fuel injection (EFI) engines. Both sensor designs output a 0 - 5.0 volt signal that is proportional to the air mass flow rate, and both sensors have an intake air temperature (IAT) sensor incorporated into their housings.

When a MAF is used in conjunction with an oxygen sensor, the engine's air/fuel ratio can be controlled very accurately. The MAF sensor provides the open-loop predicted air flow information (the measured air flow) to the ECU, and the sensor provides closed-loop feedback in order to make minor corrections to the predicted air mass.

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Wednesday, August 6th, 2008 AT 12:15 AM

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