spark plugs replace JEEP WRANGLER 2007 JK / 3.G Owners Manual

MAINTAINING YOUR VEHICLE
CONTENTS
Engine Compartment – 3.8L...............364
Onboard Diagnostic System — OBD II........365
▫Loose Fuel Filler Cap Message............366
Emissions Inspection And Maintenance
Programs............................366
Replacement Parts......................368
Dealer Service.........................368
Maintenance Procedures..................369
▫Engine Oil..........................369▫Drive Belts — Check Condition And Tension . . 372
▫Spark Plugs.........................373
▫Catalytic Converter....................373
▫Crankcase Emission Control System........375
▫Fuel Filter..........................375
▫Engine Air Cleaner Filter................375
▫Maintenance-Free Battery................376
▫Air Conditioner Maintenance.............376
▫Power Steering Fluid Check..............377
7

Spark Plugs
Spark plugs must fire properly to assure engine perfor-
mance and emission control. New plugs should be in-
stalled at the mileage specified in the appropriate main-
tenance chart. The entire set should be replaced if there is
any malfunction due to a faulty spark plug.
Refer to the “Vehicle Emission Control Information” label
in the engine compartment for spark plug information.
Catalytic Converter
The catalytic converter requires the use of unleaded fuel
only. Leaded gasoline will destroy the effectiveness of the
converter as an emission control device.
Under normal operating conditions, the catalytic con-
verter will not require maintenance. However, it is im-
portant to keep the engine properly tuned to assure
proper catalyst operation and prevent possible catalyst
damage.
CAUTION!
Damage to the catalytic converter can result if your
vehicle is not kept in proper operating condition. In
the event of engine malfunction, particularly involv-
ing engine misfire or other apparent loss of perfor-
mance, have your vehicle serviced promptly. Contin-
ued operation of your vehicle with a severe
malfunction could cause the converter to overheat,
resulting in possible damage to the converter and
vehicle.
MAINTAINING YOUR VEHICLE 373
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.XXXXX
Rotate the tires. X X
Inspect the engine air filter element, replace if necessary.X
Replace the spark plugs.X
Replace the ignition cables.X
Inspect the brake linings. X
Change the brake fluid. If vehicle is used for trailer towing. X
Drain and refill the front and rear axle fluid. X
Inspect the transfer case fluid, add if necessary. X
Inspect the drive belt, and replace as needed. Not required if
belt was previously replaced.X
Flush and replace the engine coolant/anti-freeze, if not done
at 60,000 miles (100 000 km).X
Clean and lubricate soft top zippers (if equipped). X X X X X
SCHEDULE “B” 427
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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
Rotate the tires. X X X X
Inspect the engine air filter element, and replace if necessary.X
Inspect the PCV Valve, and replace if necessary.X
Replace the spark plugs.X
Replace the ignition cables.X
Inspect the brake linings. X
Inspect the drive belt, and replace as needed. Not required if pre-
viously replaced.XX
Flush and replace the engine coolant/anti-freeze if not done at 60
months.X
Inspect the manual transmission fluid, add as necessary. X
Inspect the transfer case fluid, add as necessary. X
Clean and lubricate soft top zippers (if equipped). X X X X
SCHEDULE “A” 435
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INTRODUCTION INTRODUCTION Roll Over WarningHOW TO USE THIS MANUAL WARNINGS AND CAUTIONS VEHICLE IDENTIFICATION NUMBER VEHICLE MODIFICATIONS/ALTERATIONS THINGS TO KNOW BEFORE STARTING YOUR VEHICLE A WORD
ABOUT YOUR KEYS Ignition Key RemovalKey-In-Ignition ReminderSTEERING WHEEL LOCK - IF EQUIPPED To Manually Lock the Steering WheelTo Release the Steering Wheel LockSENTRY KEY IMMOBILIZER SYSTEM Important Note About ServiceReplacement
KeysCustomer Key ProgrammingGeneral InformationSECURITY ALARM SYSTEM - IF EQUIPPED To Set the AlarmTo Disarm the SystemILLUMINATED ENTRY REMOTE KEYLESS ENTRY - IF EQUIPPED To Unlock the Doors and Swing GateTo Lock the Doors and
Swing GateUsing The Panic AlarmTo Turn Off Flash Lights With LockProgramming Additional TransmittersGeneral InformationBattery ReplacementDOORS Front Door RemovalRear Door Removal (4 Door Models)DOOR LOCKS Manual Door LocksPower Door Locks -
If EquippedWINDOWS Power Windows - If EquippedWind BuffetingREAR SWING GATE OCCUPANT RESTRAINTS Lap/Shoulder BeltsRear Center Lap/Shoulder BeltRetractor Lock-OutAdjustable Upper Shoulder Belt AnchorageSeat Belt PretensionersEnhanced Seat
Belt Use Reminder System (BeltAlert)Seat Belts And Pregnant WomenSeat Belt ExtenderDriver And Front Passenger Supplemental Restraint Systems (SRS) Child RestraintENGINE BREAK-IN RECOMMENDATIONS SAFETY TIPS Exhaust GasSafety Checks You Should
Make Inside The VehicleSafety Checks You Should Make Outside The VehicleUNDERSTANDING THE FEATURES OF YOUR VEHICLE MIRRORS Inside Day/Night MirrorOutside MirrorsSEATS Front Seat AdjustmentManual Seat Height Adjustment - If EquippedFront Seat
Back ReclineFront Passenger Easy Entry Seat (2 Door Models)Head RestraintsFold And Tumble Rear Seat (2 Door Models)Removing the Rear Seat (2 Door Models)Replacing the Rear Seat (2 Door Models)60/40 Split Folding Rear Seat (4 Door Models)To Raise the Rear
SeatTO OPEN AND CLOSE THE HOOD LIGHTS Interior LightsMulti-Function Control LeverParking Lights, Instrument Panel Lights, and HeadlightsLights-On ReminderHeadlight Dimmer SwitchPassing LightFront Fog Lights - If EquippedTurn SignalsDaytime Running Lights
- If EquippedWINDSHIELD WIPERS AND WASHERS Intermittent Wiper SystemWindshield Wiper OperationWindshield WashersMist FeatureTILT STEERING COLUMN ELECTRONIC SPEED CONTROL - IF EQUIPPED To ActivateTo Set At A Desired SpeedTo Deactivate
To Resume SpeedTo Vary The Speed SettingManual TransmissionTo Accelerate For PassingELECTRONIC BRAKE CONTROL SYSTEM ABS (Anti-Lock Brake System)TCS (Traction Control System)BAS (Brake Assist System)ERM (Electronic Roll Mitigation)ESP (Electronic
Stability Program)ESP/BAS Warning LampELECTRICAL POWER OUTLET Electrical Outlet Use With Engine OffCUP HOLDERS STORAGE Console Storage CompartmentRear Storage CompartmentDUAL TOP - IF EQUIPPED Removing The Soft TopInstalling the Soft
TopFREEDOM TOP 3- PIECE MODULAR HARD TOP Front Panel(s) RemovalFront Panel(s) InstallationFront Panel(s) Installation Only (With Rear Hard Top Removed)Rear Panel RemovalRear Panel InstallationDOOR FRAME Door Frame Removal (2 Door Models)Door
Frame Installation (2 Door Models)Door Frame Removal (4 Door Models)Door Frame Installation (4 Door Models)SOFT TOP (2 DOOR MODELS) Folding Down TheSoft Top Putting Up The Soft Top SUNRIDER - 4 DOOR MODELS SOFT TOP (4 DOOR MODELS) Folding
Down The Soft Top Putting Up The Soft Top FOLDING WINDSHIELD Lowering the Windshield and Removing Side BarsRaising The Windshield And Replacing Side BarsREAR WINDOW FEATURES - HARD TOP ONLY Rear Window Wiper/Washer - If EquippedRear Window
Defroster - If EquippedUNDERSTANDING YOUR INSTRUMENT PANEL INSTRUMENT PANEL AND CONTROLS INSTRUMENT CLUSTER INSTRUMENT CLUSTER DESCRIPTION COMPASS AND TRIP COMPUTER - IF EQUIPPED Control ButtonsTrip Conditions
Compass Temperature DisplayRADIO GENERAL INFORMATION Radio Broadcast SignalsTwo Types of SignalsElectrical DisturbancesAM ReceptionFM ReceptionSALES CODE REQ - AM/FM STEREO RADIO AND 6-DISC CD/DVD CHANGER (MP3/WMA AUX JACK)
Operating Instructions - Radio ModeOperation Instructions - (DISC MODE for CD and MP3/WMA Audio Play, DVD-VIDEO)Notes On Playing MP3/WMA FilesLISTButton (DISC Mode for MP3/WMA Play)INFO Button (DISC Mode for MP3/WMA Play)SALES CODE RES
- AM/FM STEREO RADIO WITH CD PLAYER (MP3 AUX JACK) Operating Instructions - Radio ModeOperation Instructions - CD MODE for CD and MP3 Audio PlayNotes OnPlaying MP3 FilesLIST Button (CD Mode for MP3 Play)INFO Button (CD Mode for MP3 Play)
SALES CODE RER - AM/FM/CD/DVD RADIO WITH NAVIGATION SYSTEM - IF EQUIPPED Operating Instructions - Satellite RadioClock Setting ProcedureSATELLITERADIO - IF EQUIPPED System ActivationElectronic Serial Number/Sirius Identification Number
(ENS/SID)Selecting Satellite Mode (RSC Radios)Satellite AntennaReception QualityOperating Instructions - Satellite ModeOperating Instructions - Hands Free Phone (If Equipped)Operating Instructions - Video Entertainment System (VES) (If Equipped)CD/DVD DISC
MAINTENANCE RADIO OPERATION AND CELLULAR PHONES CLIMATE CONTROLS Manual Heater OnlyManual Air Conditioning and Heating System - If EquippedOperating TipsSTARTING AND OPERATING STARTING PROCEDURES Manual TransmissionAutomatic
TransmissionNormal StartingExtreme Cold Weather (below -20 degrees F or -29 degrees C)If Engine Fails to StartAfter StartingENGINE BLOCK HEATER - IF EQUIPPED MANUAL TRANSMISSION 6-Speed Manual TransmissionAUTOMATIC TRANSMISSION Shift Lock
Manual OverrideBrake/Transmission Interlock SystemAutomatic Transmission with OverdriveFOUR-WHEEL DRIVE OPERATION (COMMAND-TRAC OR ROCK-TRAC) - IF EQUIPPED Operating Instructions/PrecautionsShift PositionsShifting ProcedureTRAC-LOK REAR
AXLE - IF EQUIPPED AXLE LOCK (TRU-LOK) - RUBICON MODELS REAR AXLE LOCK - 4WD NON-RUBICON MODELS (IF EQUIPPED) ELECTRONIC SWAY BAR DISCONNECT - IF EQUIPPED ON-ROAD DRIVING TIPS OFF-ROAD DRIVING TIPS When To Use
4L (Low) RangeDriving Through WaterDriving In Snow, Mud and SandHill ClimbingTraction DownhillAfter Driving Off-RoadPARKING BRAKE ANTI-LOCK BRAKE SYSTEM POWER STEERING TIRE SAFETY INFORMATION Tire Markings Tire Identification Number (TIN)
Tire Loading and Tire PressureTIRES - GENERAL INFORMATION Tire PressureTire Inflation Pressures Tire Pressures for High Speed OperationRadial-Ply TiresTire SpinningTread Wear IndicatorsLife of TireReplacement TiresAlignment and BalanceTIRE CHAINS TIRE
ROTATION RECOMMENDATIONS TIRE PRESSURE MONITOR SYSTEM (TPMS) - IF EQUIPPED Base System - If EquippedGeneral InformationFUEL REQUIREMENTS Reformulated GasolineGasoline/Oxygenate BlendsMMT In GasolineMaterials Added To FuelFuel
System CautionsCarbon Monoxide WarningsADDING FUEL Fuel Filler Cap (Gas Cap)VEHICLE LOADING Certification LabelTRAILER TOWING Common Towing DefinitionsTrailer Hitch ClassificationTrailer Towing Weights (Maximum Trailer Weight Ratings)Trailer and
Tongue WeightTowing RequirementsTowing TipsRECREATIONAL TOWING (BEHIND MOTORHOME, ETC.) Towing - 2WD ModelsTowing - 4WD ModelsShifting Out Of Neutral (N)WHAT TO DO IN EMERGENCIES HAZARD WARNING FLASHERS IF YOUR ENGINE
OVERHEATS JACKING AND TIRE CHANGING Jack LocationSpare Tire StowagePreparations For JackingJacking InstructionsJUMP STARTING EMERGENCY TOW HOOKS - IF EQUIPPED TOWING A DISABLED VEHICLE MAINTAINING YOUR VEHICLE ENGINE
COMPARTMENT - 3.8L ONBOARD DIAGNOSTIC SYSTEM - OBD II Loose Fuel Filler Cap MessageEMISSIONS INSPECTION AND MAINTENANCE PROGRAMS REPLACEMENT PARTSDEALER SERVICE MAINTENANCE PROCEDURES Engine OilDrive Belts - Check
Condition and TensionSpark PlugsCatalytic ConverterCrankcase Emission Control SystemFuel FilterEngine Air Cleaner FilterMaintenance-Free BatteryAir Conditioner MaintenancePower Steering Fluid CheckDriveline And Steering Component LubricationBody Lubrication
Windshield Wiper BladesWindshield WashersExhaust SystemCooling SystemHoses and Vacuum/Vapor HarnessesBrake SystemAutomatic TransmissionHydraulic Clutch Fluid - Manual TransmissionManual TransmissionTransfer CaseFront/Rear Axle FluidAppearance Care
And Protection From CorrosionFUSES (TOTALLY INTEGRATED POWER MODULE) VEHICLE STORAGE REPLACEMENT BULBS - IF EQUIPPED BULB REPLACEMENT Head LightFront Park/Turn SignalFront Side MarkerFront Fog LightRear Tail, Stop, Turn Signal,
and Back-Up LightsCenter High Mounted Stop Light (CHMSL)FLUID CAPACITIES FLUIDS, LUBRICANTS AND GENUINE PARTS EngineChassisMAINTENANCE SCHEDULES EMISSION CONTROL SYSTEM MAINTENANCE MAINTENANCE SCHEDULES Schedule
BSchedule AIF YOU NEED CONSUMER ASSISTANCE SUGGESTIONS FOR OBTAINING SERVICE FOR YOUR VEHICLE Prepare For The AppointmentPrepare A ListBe Reasonable With RequestsIF YOU NEED ASSISTANCE WARRANTY INFORMATION (U.S. Vehicles
Only) MOPAR PARTS REPORTING SAFETY DEFECTS In CanadaPUBLICATION ORDER FORMS DEPARTMENT OF TRANSPORTATION UNIFORM TIRE QUALITY GRADES TreadwearTraction GradesTemperature GradesINDEX