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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Engine Control System - 3.8L - Introduction (2 Of 2)) >> Description and Operation >> Fuel System Description >> Deceleration Mode

Deceleration Mode

WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

When the driver releases the accelerator pedal, air flow into the engine is reduced. The powertrain control module (PCM) monitors the corresponding changes in throttle position (TP), manifold absolute pressure (MAP), and mass air flow (MAF). The PCM shuts OFF fuel completely if the deceleration is very rapid, or for long periods, such as long, closed-throttle coast-down. The fuel shuts OFF in order to prevent damage to the catalytic converters.

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