What is a “MAF” and a “MAP”?

It depends on the type of engine you have as to whether you have one or both of these.

Typically a Naturally aspirated engine configuration employs one or the other where as a Forced induced engine typically uses both a MAF sensor on the intake tract pre turbo and a MAP sensor on the charge pipe leading to the throttle body.

A “MAF” is a Mass Airflow Sensor, it is one of the components in a cars electronic fuel injection system.  A Mass Airflow Sensor is installed between the air filter & the intake manifold of the engine. The main job of the MAF sensor is to measure the amount of air entering the engine or air flow.

If the MAF becomes faulty then the ECU isn’t able to gather the correct air mass information to balance & deliver the correct fuel mass to the engine, which can be one of many causes of poor engine running.

A similar sounding Sensor is the “MAP” sensor – the Manifold Absolute Pressure Sensor.  This is one of the sensors used in an internal combustion engines ECU (electronic control unit).

Engines that use a MAP Sensor are typically fuel injected. The MAP Sensor provides instantaneous manifold pressure information to the ECU.  The data is used to calculate the air density & determine the engines air mass flow rate which in turn determines the required fuel metering for optimum combustion & influences the advance or retard of ignition timing.

If your car isn’t starting easily or is displaying a rough running engine during acceleration, deceleration or at idle then this may be the cause.

If you experience any driveability problems please get in touch with us on 07587 988174 or email us at amc.carrepairs@gmail.com,  as it may be your MAF or MAP thats not hitting the correct pressure values.