Operation CHARM
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GMC Truck
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1999
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S15/T15 Sonoma P/U 2WD V6-4.3L VIN W
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Repair and Diagnosis
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Powertrain Management
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Fuel Delivery and Air Induction
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Description and Operation
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Fuel System Description
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Modes of Operation
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Acceleration Mode
Acceleration Mode
When the control module senses rapid changes in the throttle position and the manifold pressure, the system enters the acceleration mode. The system provides the extra fuel needed for smooth acceleration.