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Manifold Absolute Pressure Sensor 8-28139776-0 16235939 for OPEL VAUXHALL ASTRA G CORSA C COMBO GMC SAVANA SIERRA

2020-11-09

Manifold Absolute Pressure Sensor 8-28139776-0 16235939 for OPEL VAUXHALL ASTRA G CORSA C COMBO GMC SAVANA SIERRA


MAP sensor introduction

The manifold absolute pressure sensor (MAP sensor) is one of the sensors used in an internal combustion engine's electronic control system.

Engines that use a MAP sensor are typically fuel injected. The manifold absolute pressure sensor provides instantaneous manifold pressure information to the engine's electronic control unit (ECU). The data is used to calculate air density and determine the engine's air mass flow rate, which in turn determines the required fuel metering for optimum combustion  and influence the advance or retard of ignition timing. A fuel-injected engine may alternatively use a mass airflow sensor (MAF sensor) to detect the intake airflow. A typical naturally aspirated engine configuration employs one or the other, whereas forced induction engines typically use both; a MAF sensor on the charge pipe leading to the throttle body and a MAP sensor on the intake tract pre-turbo.

Vacuum comparison

Engine vacuum is the difference between the pressures in the intake manifold and ambient atmospheric pressure. Engine vacuum is a "gauge" pressure, since gauges by nature measure a pressure difference, not an absolute pressure. The engine fundamentally responds to air mass, not vacuum, and absolute pressure is necessary to calculate mass. The mass of air entering the engine is directly proportional to the air density, which is proportional to the absolute pressure, and inversely proportional to the absolute temperature.

Note: Carburetors are largely dependent on air volume flow and vacuum, and neither directly infers mass. Consequently, carburetors are precise, but not accurate fuel metering devices. Carburetors were replaced by more accurate fuel metering methods, such as fuel injection in combination with an air mass flow sensor (MAF).

Sample product

Manifold Absolute Pressure Sensor 8-28139776-0 16235939 for OPEL VAUXHALL ASTRA G CORSA C COMBO GMC SAVANA SIERRA

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