Shop for New Auto Parts at 1AAuto.com this video to learn all about Manifold Absolute Pressure (MAP) sensors, and how The manifold absolute pressure sensor measures the pressure in the air intake manifold and sends this data to the engine control unit (ECU). The ECU uses this information to determine the air -fuel ratio for the combustion process , thereby influencing engine performance and efficiency. The manifold absolute pressure (MAP) sensor monitors this and reports the information to the engine's computer. If the MAP sensor starts to fail, these are some of the most common symptoms: 1. Your engine accelerates poorly: If a MAP sensor fails, it can cause the engine's computer to miscalculate the amount of fuel and ignition timing When idling, intake pressure usually ranges from 16-22 in. Hg. Because this is lower than atmospheric pressure, air rushes into the intake. When the driver uses the engine to brake, pressure can go as low as 10 in. Hg. Upon accelerating, however, the open throttle body allows air to rush in faster, increasing pressure in the intake. The intake manifold pressure sensor measures the intake manifold vacuum that exists in the intake manifold after the throttle. The measured values of the intake manifold pressure sensor and the intake air temperature sensor are required to calculate the intake air mass. Depending on the injection system, the intake manifold pressure sensor and .

intake manifold pressure sensor symptoms