![]() ![]() The throttle is not open very wide or may be closed causing intake vacuum to increase. When conditions change and the vehicle is cruising along under light load, coasting or decelerating, less power is needed from the engine. At the same time, the computer will retard (back off) ignition timing slightly to prevent detonation (spark knock) that can damage the engine and hurt performance. In fact, when the computer reads a heavy load signal from the MAP sensor, it usually makes the fuel mixture go slightly richer than normal so the engine can produce more power. The engine sucks in more air, which requires more fuel to keep the air/fuel ratio in balance. When the engine is working hard, intake vacuum drops as the throttle opens wide. The engine computer then uses this information to adjust ignition timing and fuel enrichment. The sensor generates a signal that is proportional to the amount of vacuum in the intake manifold. The Manifold Absolute Pressure (MAP) sensor is a key sensor because it senses engine load. Manifold Absolute Pressure MAP Sensors by Larry Carley copyright 2022 Auto Repair Library, Auto Parts, Accessories, Tools, Manuals & Books, Car BLOG, Links, Index ![]()
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