spark plugs replace JEEP GRAND CHEROKEE 2005 WK / 3.G Owners Manual

MAINTAINING YOUR VEHICLE
CONTENTS

3.7L Engine...........................310

4.7L Engine...........................311

5.7L Engine...........................312

Onboard Diagnostic System — OBD II........313
▫Loose Fuel Filler Cap Message............313

Emissions Inspection And Maintenance
Programs............................314

Replacement Parts......................315

Dealer Service.........................316
Maintenance Procedures..................316
▫Engine Oil..........................316
▫Drive Belts - Check Condition And Tension . . . 320
▫Spark Plugs.........................321
▫Catalytic Converter....................321
▫Ignition Cables.......................323
▫Crankcase Emission Control System........323
▫Fuel Filter..........................323
▫Air Cleaner Filter.....................323
7

Special tools are required to properly measure tension
and to restore belt tension to factory specifications. Also,
check belt routing to make sure there is no interference
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 the “Vehicle Emission Control Informa-
tion” 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 321
7

Miles 18,000 21,000 24,000 27,000 30,000
(Kilometers) (29 000) (34 000) (38 000) (43 000) (48 000)
Change the engine oil and engine oil filter, if not
replaced at 3 months.X X XXX
Rotate the tires. X X X
Inspect the engine air cleaner filter, replace if nec-
essary.X
Inspect the PCV Valve, replace if necessary. X
Replace the spark plugs.X
Lubricate the upper knuckle ball stud at steering &
suspension ball joints.XXX
Drain and refill the front and rear axles. X
Inspect the brake linings. X
Drain the transfer case and refill.X
SCHEDULE “B” 367
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Miles 48,000 51,000 54,000 57,000 60,000
(Kilometers) (77 000) (82 000) (86 000) (91 000) (96 000)
Change the engine oil and engine oil filter, if not
replaced at 3 months.X X XXX
Rotate the tires. X X X
Inspect the engine air cleaner filter, replace if nec-
essary.X
Inspect the PCV Valve, replace if necessary. X
Replace the spark plugs.X
Inspect the ignition cables, replace if necessary
(5.7L Only).X
Inspect drive belt, replace if necessary. X
Lubricate the upper knuckle ball stud at steering &
suspension ball joints.XXX
Inspect the brake linings. X X
SCHEDULE “B” 369
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Miles 78,000 81,000 84,000 87,000 90,000
(Kilometers) (125 000) (130 000) (134 000) (139 000) (144 000)
Change the engine oil and engine oil filter, if not
replaced at 3 months.X X XXX
Rotate the tires. X X X
Inspect the engine air cleaner filter, 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
Lubricate the upper knuckle ball stud at steering &
suspension ball joints.XXX
Drain and refill the transfer case fluid. X
Inspect the brake linings. X
Drain and refill the front and rear axle fluid. X
372 SCHEDULE “B”
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Miles 108,000 111,000 114,000 117,000 120,000
(Kilometers) (173 000) (178 000) (182 000) (187 000) (192 000)
Change the engine oil and engine oil filter, if not
replaced at 3 months.X X XXX
Rotate the tires. X X X
Inspect the engine air cleaner filter, replace if nec-
essary.X
Inspect the PCV Valve, replace if necessary. X
Replace the spark plugs.X
Inspect the ignition cables, replace if necessary
(5.7L Only).X
Inspect the drive belt, replace if necessary. X
Lubricate the upper knuckle ball stud at steering &
suspension ball joints.XXX
Inspect the brake linings. X X
Drain and refill the front and rear axle fluid. X X
374 SCHEDULE “B”
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Schedule “A”
Miles 6,000 12,000 18,000 24,000 30,000
(Kilometers) (10 000) (19 000) (29 000) (38 000) (48 000)
[Months] [6] [12] [18] [24] [30]
Change the engine oil and engine oil filter. X X X X X
Rotate the tires. X X X X X
Inspect the engine air cleaner filter, and replace if
necessary.X
Replace the spark plugs.X
Lubricate the upper knuckle ball stud at steering &
suspension ball joints.XX
Inspect the brake linings. X
Drain the transfer case and refill.X
376 SCHEDULE “A”
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Miles 60,000 66,000 72,000 78,000
(Kilometers) (96 000) (106 000) (115 000) (125 000)
[Months] [60] [66] [72] [78]
Change the engine oil and engine oil filter. X X X X
Rotate the tires. 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 ignition cables, replace if necessary (5.7L
Only).X
Inspect the drive belt, replace if necessary. X
Lubricate the upper knuckle ball stud at steering & sus-
pension ball joints.XX
Flush and replace the engine coolant/anti-freeze, at 60
months if not done at 102,000 miles (163 000 km).X
Inspect the brake linings. X
Drain the transfer case and refill. X
378 SCHEDULE “A”
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Miles 84,000 90,000 96,000 102, 000
(Kilometers) (134 000) (144 000) (154 000) (163 000)
[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 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
Lubricate the upper knuckle ball stud at steering & sus-
pension ball joints.XX
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” 379
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Miles 108,000 114,000 120,000
(Kilometers) (173 000) (182 000) (192 000)
[Months] [108] [114] [120]
Change the engine oil and engine oil filter. X X X
Rotate the tires. X X X
Inspect the engine air cleaner filter, and replace if necessary.X
Inspect the PCV Valve, replace if necessary. X
Replace the spark plugs.X
Inspect the ignition cables, replace if necessary (5.7L Only).X
Inspect the drive belt, replace if necessary. X
Lubricate the upper knuckle ball stud at steering & suspension
ball joints.XX
Inspect the brake linings. X
Flush and replace the engine coolant/anti-freeze if not done at
102,000 miles (163 000 km).X
Drain the transfer case and refill.X
380 SCHEDULE “A”
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