2008 JEEP GRAND CHEROKEE engine

WARNING!
It is dangerous to shift the selector lever out of P
(Park) or N (Neutral) if the engine speed is higher
than idle speed. If your foot is not firmly on the
brake pedal, the vehicle could accelerate quickly
forward or in reverse. You could lose control of the
vehicle and hit someone or something. Only shift
into gear when the engine is idling normally and
when your foot is firmly on the brake pedal.
Shift Lock Manual Override Ð If Equipped
Your vehicle may be equipped with a shift lock manual
override. The manual override may be used in the event
that the shift lever should fail to move from Park with the
key in the ON position and the brake pedal depressed. To
operate the shift lock manual override, perform the
following steps:
1. Firmly set the parking brake.
2. Using a flat blade screwdriver, carefully remove the
shift lock manual override cover which is located on the
PRNDL bezel.
3. Depress and maintain firm pressure on the brake
pedal.
4. Using the screwdriver, reach into the manual override
opening. Press and hold the shift lock lever down.
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WARNING!
It is dangerous to shift the selector lever out of P
(Park) or N (Neutral) if the engine speed is higher
than idle speed. If your foot is not firmly on the
brake pedal, the vehicle could accelerate quickly
forward or in reverse. You could lose control of the
vehicle and hit someone or something. Only shift
into gear when the engine is idling normally and
when your foot is firmly on the brake pedal.
Gear Ranges
NOTE:After selecting any gear range, wait a moment to
allow the selected gear to engage before accelerating.
This is especially important when the engine is cold. If
there is a need to restart the engine be sure to cycle the
key to the LOCK position before restarting. Transmission
gear engagement may be delayed after restarting the
engine if the key is not cycled to the LOCK position first.
P (Park)
Supplements the parking brake by locking the transmis-
sion. The engine can be started in this range. Never use P
(Park) while the vehicle is in motion. Apply the parking
brake when leaving the vehicle in this range.
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WARNING!
Unintended movement of a vehicle could injure
those in and near the vehicle. As with all vehicles,
you should never exit a vehicle while the engine is
running. Before exiting a vehicle, you should apply
the park brake, shift the transmission into P (Park),
and remove the key from the ignition. Once the key
is removed from the ignition the transmission shift
lever is locked in the P (Park) position, securing the
vehicle against unwanted movement. Furthermore,
you should never leave children unattended inside a
vehicle.
R (Reverse)
Shift into this range only after the vehicle has come to a
complete stop.
N (Neutral)
No power is transmitted from the engine to the drive
axle. When the brakes are released, the vehicle can roll
freely. Do not engage in N (Neutral) position while
driving except to coast when the vehicle is in danger of
skidding (e.g., on icy roads).
D (Drive)
Shift into D (Drive) only when the vehicle is at a complete
stop and the brakes are firmly applied. The transmission
automatically upshifts through fifth gear. The D (Drive)
position provides optimum driving characteristics under
all normal operating conditions. For additional shifting
information, refer to ªAutostickº later in this section.
Rocking the Vehicle
If the vehicle becomes stuck in snow, sand, or mud, it can
often be moved by a rocking motion. Move the gear
selector rhythmically between D (Drive) and R (Reverse),
while applying slight pressure to the accelerator.
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5

NOTE:The Electronic Stability Program (ESP) and
Traction Control (if equipped) should be turned OFF
before attempting to rock the vehicle. Refer to ªElectronic
Brake Control Systemº in Section 3 of this manual.
The least amount of accelerator pedal pressure to main-
tain the rocking motion without spinning the wheels or
racing the engine is most effective. Racing the engine or
spinning the wheels, due to the frustration of not freeing
the vehicle, may lead to transmission overheating and
failure. Allow the engine to idle with the transmission
selector in N (Neutral) for at least one minute after every
five rocking-motion cycles. This will minimize overheat-
ing and reduce the risk of transmission failure during
prolonged efforts to free a stuck vehicle.CAUTION!
When ªrockingº a stuck vehicle by moving between
ªFirstº and R (Reverse), do not spin the wheels faster
than 15 mph (24 km/h), or drivetrain damage may
result.
AUTOSTICK
Autostick is a driver-interactive transmission that offers
manual gear shifting capability to provide the driver
with more control. Autostick allows the driver to increase
engine braking ability, control upshift and downshift
points, and enhance the driving experience. This system
can also provide the driver with more control during
passing, city driving, mountain driving, trailer towing,
and many other situations.
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Autostick Operation
By placing the shift lever in the D (Drive) position the
lever can be moved from side to side. This allows the
driver to engage the AutoStick mode. Moving the shift
lever to the right (+) or the left (-) will engage the
Autostick mode. In normal driving mode (Boxed ªDº
displayed in the PRNDL), moving the shift lever to the
right (+) will engage the Autostick mode putting the
transmission in the currently engaged gear. Moving the
shift lever to the Left (-) will engage the Autostick mode
and downshift the transmission 1 gear. For example, the
transmission is in Normal Mode and is currently operat-
ing in 3rd gear, a boxed D is displayed in the PRNDL, a
push to the right will engage the Autostick mode in 3rd
and a Boxed 3 will be displayed in the PRNDL. A push to
the left (-) will engage Autostick mode and downshift to
2nd gear and a Boxed 2 will be displayed in the PRNDL.Once Autostick mode is engaged a move to the Right (+)
or left (-) will trigger a upshift (+) or trigger a downshift
(-).
NOTE:In the Autostick mode, the transmission will
only shift up and down when Left or Right (D-/D+) is
manually selected by the driver.
The transmission will not allow a downshift if the
downshift would result in a engine overspeed condition.
The transmission will always allow a upshift from 1st to
2nd gear, however 2nd - 3rd, 3rd - 4th, and 4th ± 5th
upshifts will not be allowed if the vehicle speed is to low
to maintain operation in the selected gear. The transmis-
sion will automatically downshift as the vehicle slows to
a stop.
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When in the Autostick mode, as the engine RPM nears
the engine maximum speed, an ªUPSHIFTº message will
appear in the Electronic Vehicle Information Center
(EVIC) portion of your instrument cluster. This message
appears in order to alert the driver that the engine speed
is approaching it's maximum value and a upshift to the
next gear is required. In the event that the driver does not
upshift, the engine control system will automatically do it
for the driver. Refer to ªElectronic Vehicle Information
Centerº in Section 4 of this manual.
Shifting into or out of the Autostick mode can be done at
any time without taking your foot off the accelerator
pedal. When the driver wishes to engage Autostick,
simply move the shift lever to the Left or Right (D-/D+)
position while in D (Drive).
Hold the shift lever to the right for at least one second to
disengage Autostick. The transmission will now operate
automatically; shifting between the five available gears.Autostick General Information
²
You can start out in first or second gear. The system
will ignore attempts to upshift at too low of a vehicle
speed.
²The transmission will automatically downshift to first
gear when coming to a stop.
²Starting out in second gear is helpful in snowy or icy
conditions.
²Avoid using speed control when Autostick is engaged.
²The transmission will automatically shift up when
maximum engine speed is reached while Autostick is
engaged.
²Transmission shifting will be more noticeable when
Autostick is engaged.
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WARNING!
To use your brakes and accelerator more safely,
follow these tips:
²Do not ªrideº the brakes by resting your foot on the
pedal. This could overheat the brakes and result in
unpredictable braking action, longer stopping dis-
tances, or brake damage.
²When descending mountains or hills, repeated brak-
ing can cause brake fade with loss of braking control.
Avoid repeated heavy braking by downshifting the
transmission or locking out overdrive whenever pos-
sible.
²Engines may idle at higher speeds during warm-up,
which could cause rear wheels to spin and result in
loss of vehicle control. Be especially careful while
driving on slippery roads, in close-quarter maneuver-
ing, parking or stopping.
²Do not drive too fast for road conditions, especially
when roads are wet or slushy. A wedge of water can
build up between the tire tread and the road. This
hydroplaning action can cause loss of traction, braking
ability, and control.
²After going through deep water or a car wash, brakes
may become wet, resulting in decreased performance
and unpredictable braking action. Dry the brakes by
gentle, intermittent pedal action while driving at very
slow speeds.
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any of the four active road tires. The vehicle may need to
be driven for up to 10 minutes above 15 mph (24 km/h)
in order for the TPMS to receive this information.
General Information
This device complies with part 15 of the FCC rules and
RSS 210 of Industry Canada. Operation is subject to the
following conditions:
²This device may not cause harmful interference.
²This device must accept any interference received,
including interference that may cause undesired op-
eration.
The tire pressure sensors are covered under one of the
following licenses:
United States.....................KR5S120123
Canada........................2671-S120123
FUEL REQUIREMENTS
6.1L Engine
The 6.1L engine is designed to meet all
emissions regulations and provide excel-
lent fuel economy and performance when
using high-quality premium unleaded
gasoline with an octane rating of 91 or
higher.
Light spark knock at low engine speeds is not harmful to
your engine. However, continued heavy spark knock at
high speeds can cause damage and immediate service is
required. Poor quality gasoline can cause problems such
as hard starting, stalling, and hesitations. If you experi-
ence these symptoms, try another brand of gasoline
before considering service for the vehicle.
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