MAP Sensor Replacement
What is a map sensor?
The manifold absolute pressure (MAP) sensor, is located on or around the intake manifold, and provides constant information concerning the amount of pressure inside the intake manifold.
How does the map sensor work?
The engine's computer has to receive input from many sensors, and ensure they are in agreement. An extremely important sensor that is used in reference to nearly all engine operations is the manifold absolute pressure (MAP) sensor. The MAP sensor records the air pressure in the intake manifold, and reports that information to the computer. This allows the computer to calculate, or confirm, the amount of air moving into the engine, amount of exhaust gas to expect, the amount of fuel to send into the engine, and many other important factors. Lastly, this sensor works very closely with the mass airflow (MAF) sensor to allow extremely accurate response to changing conditions.
When a MAP sensor fails, the vehicle may exhibit engine performance problems such as poor power, rough idle, poor fuel economy, and excessive tail pipe smoke. The Check Engine Light may illuminate and codes may set for a defective MAP sensor.