2006 JEEP GRAND CHEROKEE spark plugs replace

MAINTAINING YOUR VEHICLE
CONTENTS

6.1L Engine...........................296

Onboard Diagnostic System — OBD II........297
▫Loose Fuel Filler Cap Message............297

Emissions Inspection And Maintenance
Programs............................298

Replacement Parts......................299

Dealer Service.........................300

Maintenance Procedures..................300
▫Engine Oil..........................301▫Engine Oil Filter......................304
▫Drive Belts — Check Condition And
Tensioner...........................304
▫Spark Plugs.........................305
▫Engine Air Cleaner Filter................305
▫Fuel Filter..........................305
▫Catalytic Converter....................306
▫Maintenance-Free Battery................307
▫Air Conditioner Maintenance.............309
7

Spark Plugs
Spark plugs must fire properly to assure engine perfor-
mance and emission control. New plugs should be in-
stalled at the specified mileage. The entire set should be
replaced if there is any malfunction due to a faulty spark
plug. Malfunctioning spark plugs can damage the cata-
lytic converter. For proper type of replacement spark
plugs, refer to the “Vehicle Emission Control Informa-
tion” label in the engine compartment.
Engine Air Cleaner Filter
Under normal driving conditions, replace the air filter at
the intervals shown on “Maintenance Schedule A.” If,
however, you drive the vehicle frequently under dusty or
severe conditions, the filter element should be inspected
periodically and replaced if necessary at the intervals
shown on “Maintenance Schedule B.”
WARNING!
The air cleaner can provide a measure of protection
in the case of engine backfire. Do not remove the air
cleaner unless such removal is necessary for repair or
maintenance. Make sure that no one is near the
engine compartment before starting the vehicle with
the air cleaner removed. Failure to do so can result in
serious personal injury.
Fuel Filter
A plugged fuel filter can cause stalling, limit the speed at
which a vehicle can be driven or cause hard starting.
Should an excessive amount of dirt accumulate in the
fuel tank, filter replacement may be necessary. See your
local dealer for service.
MAINTAINING YOUR VEHICLE 305
7

Miles 93,000 96,000 99,000 102,000 105,000
(Kilometers) (155 000) (160 000) (165 000) (170 000) (175 000)
Change the engine oil and engine oil filter, if not
replaced at 3 months.X X XXX
Inspect the engine air cleaner filter, replace if nec-
essary.X
Replace the spark plugs.X
Inspect the drive belt, replace if necessary.* X
Inspect the brake linings. X
Drain and refill the front and rear axle fluid. X
Flush and replace the engine coolant/anti-freeze, if
not done at 60 months.X
356 SCHEDULE “B”
8
M
A
I
N
T
E
N
A
N
C
E
S
C
H
E
D
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Miles 84,000 90,000 96,000 102, 000
(Kilometers) (140 000) (150 000) (160 000) (170 000)
[Months] [84] [90] [96] [102]
Change the engine oil and engine oil filter. X X X X
Inspect the engine air cleaner filter, and replace if nec-
essary.X
Inspect the PCV Valve, replace if necessary.X
Replace the spark plugs.X
Inspect the drive belt, replace if necessary.* X
Inspect the brake linings. X
Flush and replace the engine coolant/anti-freeze if not
replaced at 60 months.X
Drain the transfer case and refill. X
SCHEDULE “A” 361
8
M
A
I
N
T
E
N
A
N
C
E
S
C
H
E
D
U
L
E
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Maintenance........................71,328
Pretensioners.......................... 39
Reminder............................ 181
Shoulder Belt Anchorage.................. 37
Seats................................. 105
Adjustment.......................... 105
Cleaning............................ 327
Easy Entry........................... 115
Head Restraints....................... 107
Heated............................. 108
Lumbar Support....................... 106
Memory............................. 112
Power.............................. 108
Rear Folding......................... 109
Reclining............................ 106
Security Against Theft..................... 16
Security Alarm (Theft Alarm).............25,178
Selection of Coolant (Antifreeze)............. 315
Selection of Oil......................... 303Sentry Key (Immobilizer)................... 13
Sentry Key Programming................... 15
Sentry Key Replacement................... 14
Service Assistance....................... 366
Service Contract......................... 368
Service Engine Soon Light (Malfunction Indicator) . 176
Service Manuals........................ 370
Setting the Clock.....................200,213
Shifting
Automatic Transmission................. 236
Shoulder Belts........................... 33
Signals, Turn...................124,176,337,339
SmartBeams........................... 122
Spark Plugs............................ 305
Speed Control (Cruise Control).............. 146
Speedometer........................... 176
Starting............................... 234
Automatic Transmission................. 234
Cold Weather......................... 235
386 INDEX