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Home >> Chevrolet >> 2004 >> Cutaway 4.8 V >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Engine Control System - 4.3L (Introduction)) >> Description & Operation >> Fuel System Description >> Deceleration Mode

Deceleration Mode

WARNING: This page is about a different car, the 2004 GMC Savana and 2004 Chevrolet Chevy Express. 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 control module monitors the corresponding changes in the TP, the MAP, and the MAF. The control module 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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