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Home >> Chevrolet >> 2004 >> Impala SS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Control System 3.4L (Introduction)) >> Description and Operation >> Fuel System Description >> Deceleration Mode

Deceleration Mode

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When the driver releases the accelerator pedal, air flow into the engine is reduced. The PCM reads the corresponding changes in TP, MAP, and 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 protect the 3-way catalytic converters (TWC).

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