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Home >> Chevrolet >> 1989 >> Astro Van M L4-151 2.5L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Description and Operation >> Operating Modes >> Deceleration Mode
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Deceleration Mode


In the Deceleration Mode, the ECM senses changes in throttle position and manifold pressure and reduces fuel delivery. When decelerating very rapidly, the ECM can cut off fuel completely for short periods of time.