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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 >> Acceleration Mode

Acceleration Mode

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When the driver pushes on the accelerator pedal, air flow into the cylinders increases rapidly, while fuel flow tends to lag behind. To prevent possible hesitation, the PCM increases the pulse width to the injectors to provide extra fuel during acceleration. The PCM determines the amount of fuel required based upon the TP, the coolant temperature, the MAP, the MAF, and the engine speed.