2006 JEEP LIBERTY spark plugs replace

MAINTAINING YOUR VEHICLE
CONTENTS

3.7L Engine ...........................314

2.8L Turbo Diesel Engine .................315

Onboard Diagnostic System — OBD II ........316
▫ Loose Fuel Filler Cap Message ............316

Emissions Inspection And Maintenance
Programs ............................317

Replacement Parts ......................318

Dealer Service .........................318

Maintenance Procedures ..................319 ▫
Engine Oil ..........................319
▫ Drive Belts — Check Condition And Tension . . 323
▫ Spark Plugs .........................324
▫ Catalytic Converter ....................324
▫ Crankcase Emission Control System ........326
▫ Air Cleaner Filter .....................326
▫ Maintenance-Free Battery ................326
▫ Air Conditioner Maintenance .............327
▫ Power Steering Fluid Check ..............328
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.
324 MAINTAINING YOUR VEHICLE

Miles 18,000 21,000 24,000 27,000 30,000
(Kilometers) (30 000) (35 000) (40 000) (45 000) (50 000)
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 filter element, replace if
necessary. X
Replace the spark plugs. X
Inspect and replace the PCV valve, if necessary. X
Inspect the brake linings. X
Inspect the manual transmission fluid, add as nec-
essary. X
Drain and refill the front and rear axle fluid‡ X
Inspect the transfer case fluid, add if necessary. X
SCHEDULE “B” — GASOLINE ENGINES 371
8
M A I
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Miles 48,000 51,000 54,000 57,000 60,000
(Kilometers) (80 000) (85 000) (90 000) (95 000) (100 000)
Change the engine oil and engine oil filter, if not replaced
at 3 months. XXXXX
Rotate the tires. X X X
Inspect the engine air filter element, replace if necessary. X
Replace the spark plugs. X
Inspect and replace the PCV valve, if necessary. X
Inspect the brake linings. X X
Drain and refill the front and rear axle fluid‡ X
Inspect the manual transmission fluid, add as necessary. X
Drain and refill the automatic transmission fluid, replace
main sump filter, and spin-on cooler return filter (if
equipped).† X
Inspect the drive belt and replace as needed. Not required
if belt was previously replaced. X
Drain and refill the transfer case fluid. X
Flush and replace the engine coolant/anti-freeze. X
SCHEDULE “B” — GASOLINE ENGINES 373
8
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Miles 78,000 81,000 84,000 87,000 90,000
(Kilometers) (130 000) (135 000) (140 000) (145 000) (150 000)
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 filter element, replace if
necessary. X
Replace the spark plugs. X
Inspect and replace the PCV valve, if necessary. X
Inspect the brake linings. X
Inspect the manual transmission fluid, add as nec-
essary. X
Drain and refill the front and rear axle fluid‡ X
Inspect the drive belt and replace as needed. Not
required if belt was previously replaced. X
Inspect the transfer case fluid, add if necessary. X
SCHEDULE “B” — GASOLINE ENGINES 375
8
M A I
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C
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Miles 108,000 111,000 114,000 117,000 120,000
(Kilometers) (180 000) (185 000) (190 000) (195 000) (200 000)
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 filter element, replace if
necessary. X
Replace the spark plugs. X
Inspect and replace the PCV valve, if necessary. X
Inspect the brake linings. X X
Drain and refill the front and rear axle fluid‡ X
Inspect the manual transmission fluid, add as nec-
essary. X
Drain and refill the automatic transmission fluid,
replace main sump filter, and spin-on cooler return
filter (if equipped).† X
Inspect the drive belt and replace as needed. Not
required if belt was previously replaced. X
SCHEDULE “B” — GASOLINE ENGINES 377
8
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Schedule “A” — Gasoline Engines
Miles 6,000 12,000 18,000 24,000 30,000
(Kilometers) (10 000) (20 000) (30 000) (40 000) (50 000)
[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 filter element, and replace
if necessary. X
Replace the spark plugs. X
Inspect the manual transmission fluid, add as nec-
essary. X
Inspect the brake linings. X
Inspect the transfer case fluid. X
SCHEDULE “A” — GASOLINE ENGINES 379
8
M
A I
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Miles 60,000 66,000 72,000 78,000
(Kilometers) (100 000) (110 000) (120 000) (130 000)
[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 filter element, and replace if nec-
essary. X
Replace the spark plugs. X
Inspect and replace the PCV valve, if necessary. X
Inspect the brake linings. X
Inspect the drive belt and replace, if needed. X
Inspect the drive belt and replace as needed. Not re-
quired if previously replaced. X
Flush and replace the engine coolant/anti-freeze. X
Inspect the manual transmission fluid, add as necessary. X
Inspect the transfer case fluid. X
SCHEDULE “A” — GASOLINE ENGINES 381
8
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