Active Fuel Management; Automatic Transmission Operation; L V6 And 5.3L V8 Engines - Chevrolet 2008 Impala Owner's Manual

Active Fuel Management™

(3.9L V6 and 5.3L V8 Engines)

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.
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Automatic Transmission Operation

Your automatic transmission has a shift lever on the
steering column or on the console between the seats.
Maximum engine speed is limited on automatic
transmission vehicles while you are in PARK (P) or
NEUTRAL (N) to protect driveline components
from improper operation.
There are several different positions for the shift lever.
There is a display, located
on the instrument panel
cluster that will indicate the
gear the vehicle is in.