2008 Pontiac Grand Prix Owner's Manual - Page 100

Active Fuel Management™ Your vehicle's engine may be equipped with Active Fuel Management™. This system allows the engine to operate on either all or half of its cylinders, depending on your driving conditions. When less power is required, such as cruising at a constant vehicle speed, the system will operate in the half cylinder mode, allowing your vehicle to achieve better fuel economy. When greater power demands are required, such as accelerating from a stop, passing, or merging onto a freeway, the system will maintain full-cylinder operation. Automatic Transmission Operation The shift lever for the automatic transmission is located on the console between the seats. Maximum engine speed is limited when the vehicle is in PARK (P) or NEUTRAL (N) to protect driveline components from improper operation. There are several different positions for the shift lever. 3800 V6 Engine PARK (P): This position locks the front wheels. It is the best position to use when the engine is started because the vehicle cannot move easily. 2-28