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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 185 (Engine Controls - 3.5L - Introduction (2 Of 2)) >> Description and Operation >> Fuel System Description >> Deceleration Mode

Deceleration Mode

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. 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) reads the corresponding changes in throttle position, manifold air pressure and mass air flow. 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 protect the catalytic converters.

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