2008 JEEP GRAND CHEROKEE spark plugs

MAINTAINING YOUR VEHICLE
CONTENTS
mEngine Compartment ± 6.1L...............306
mOnboard Diagnostic System Ð OBD II........307
NLoose Fuel Filler Cap Message............308
mEmissions Inspection And Maintenance
Programs............................308
mReplacement Parts......................310
mDealer Service.........................310
mMaintenance Procedures..................311
NEngine Oil..........................311NEngine Oil Filter......................315
NDrive Belts Ð Check Condition And
Tensioner...........................315
NSpark Plugs.........................316
NEngine Air Cleaner Filter................316
NFuel Filter..........................317
NCatalytic Converter....................317
NMaintenance-Free Battery................318
NAir Conditioner Maintenance.............319
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At the mileage indicated on the appropriate ªMainte-
nance Schedule,º all belts and tensioner should be
checked for condition. Improper belt tension can cause
belt slippage and failure.
Belts should be inspected for evidence of cuts, cracks,
glazing, or frayed cords and replaced if there is indication
of damage which could result in belt failure. Low gen-
erator belt tension can cause battery failure.
Also check belt routing to make sure there is no interfer-
ence between the belts and other engine components.
Spark Plugs
Spark plugs must fire properly to assure engine perfor-
mance and emission control. New spark plugs should be
installed at the specified mileage. The entire set should be
replaced if there is any malfunction due to a faulty spark
plug. Refer to ªFluids, Lubricants, and Genuine Partsº in
this section for spark plug information.
Engine Air Cleaner Filter
Under normal driving conditions, replace the air filter at
the intervals shown on ªMaintenance Schedule A.º 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 ªMaintenance Schedule B.º
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.
316 MAINTAINING YOUR VEHICLE

FLUIDS, LUBRICANTS, AND GENUINE PARTS
Engine
Component Fluid, Lubricant, or Genuine Part
Engine Coolant MopartAntifreeze/Coolant 5 Year/100,000 Mile Formula HOAT (Hybrid Or-
ganic Additive Technology)
Engine Oil (6.1L Engine) For best performance and maximum protection under all types of operating
conditions, the manufacturer only recommends full synthetic engine oils that
meet the American Petroleum Institute (API) categories of SM or SM/CF, and
meet the requirements of DaimlerChrysler Material Standard MS-10725. The
manufacturer recommends the use of a full synthetic engine oil, such as Mo-
bil 1 SAE 0W-40 or equivalent. For additional information, refer to the ªEn-
gine Oil Selectionº and ªEngine Oil Viscosity (SAE Grade)º in the ªMainte-
nance Proceduresº section of this manual.
Oil Filter (6.1L Engine) MopartOil Filter (P/N 05281090) or equivalent.
Spark Plugs PLZTR5AÐ13 (Gap 0.050º)
Fuel Selection (6.1L Engine) Premium Unleaded 91 Octane Only or higher.
MAINTAINING YOUR VEHICLE 353
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
366 SCHEDULE ªBº
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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.LX
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
372 SCHEDULE ªAº
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Sound Systems (Radio).................... 212
Spark Plugs............................ 316
Speed Control (Cruise Control).............. 131
Speedometer........................... 174
Starting............................... 242
Automatic Transmission................. 242
Cold Weather......................... 243
Engine Fails to Start.................... 244
Remote.............................. 24
Steering
Power...........................258,320
Tilt Column.......................... 129
Wheel, Tilt........................... 129
Steering Wheel Mounted Sound System
Controls.............................. 227
Storage............................... 345
Storage, Behind the Seat................... 162
Storage Bin............................ 162
Storage Compartment, Center Seat............ 113Storage, Vehicle......................237,345
Storing Your Vehicle...................... 345
Sun Roof.............................. 155
Sunglasses Storage....................... 148
Supplemental Restraint System - Airbag........ 45
Sway Control, Trailer..................... 140
System, Navigation...................... 215
System, Remote Starting.................... 24
Tachometer............................ 176
Telescoping Steering Column............... 129
Temperature Control, Automatic (ATC)........ 229
Temperature Gauge, Engine Coolant.......... 178
Tether Anchor, Child Restraint............... 60
Tie Down Hooks, Cargo................... 164
Tilt Steering Column..................... 129
Time Delay, Headlight.................... 124
Tire and Loading Information Placard......... 263
Tire Identification Number (TIN)............. 262
400 INDEX