spark plugs replace CHRYSLER VOYAGER 2001 Service Manual

every other interval on Schedule ± B (6,000 miles -
10 000 km).
²Check the engine coolant level, hoses, and
clamps.
EMISSION CONTROL SYSTEM MAINTENANCE
The scheduled emission maintenance listed inbold
typeon the Maintenance Schedules, must be done at
the mileage specified to assure the continued proper
functioning of the emission control system. These,
and all other maintenance services included in this
manual, should be done to provide the best vehicle
performance and reliability. More frequent mainte-
nance may be needed for vehicles in severe operating
conditions such as dusty areas and very short trip
driving.
DESCRIPTION - MAINTENANCE SCHEDULES
SCHEDULE±A±CHRYSLER TOWN AND
COUNTRY VEHICLES
7,500 Miles (12 000 km) or at 6 months
²Change the engine oil.
²Replace the engine oil filter.
15,000 Miles (24 000 km) or at 12 months
²Change the engine oil.
²Replace the engine oil filter.
22,500 Miles (36 000 km) or at 18 months
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
30,000 Miles (48 000 km) or at 24 months
²Change the engine oil.
²Replace the engine oil filter.
²Replace the engine air cleaner element (fil-
ter).
²Inspect the tie rod ends and boot seals.
37,500 Miles (60 000 km) or at 30 months
²Change the engine oil.
²Replace the engine oil filter.
45,000 Miles (72 000 km) or at 36 months
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
52,500 Miles (84 000 km) or at 42 months
²Change the engine oil.
²Replace the engine oil filter.
60,000 Miles (96 000 km) or at 48 months
²Change the engine oil.
²Replace the engine oil filter.
²Replace the engine air cleaner element (fil-
ter).
²Check the PCV valve and replace, if neces-
sary.*
²Inspect the serpentine drive belt, replace if nec-
essary.
²Inspect the tie rod ends and boot seals.
67,500 Miles (108 000 km) or at 54 months
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
75,000 Miles (120 000 km) or at 60 months
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the serpentine drive belt and replace if
necessary. This maintenance is not required if the
belt was previously replaced.
²Flush and replace engine coolant at 60 months.
82,500 Miles (132 000 km) or at 66 months
²Change the engine oil.
²Replace the engine oil filter.
90,000 Miles (144 000 km) or at 72 months
²Change the engine oil.
²Replace the engine oil filter.
²Replace the engine air cleaner element (fil-
ter).
²Check the PCV valve and replace, if neces-
sary. Not required if previously changed.*
²Inspect the serpentine drive belt, replace if nec-
essary. This maintenance is not required if the belt
was previously replaced.
²Inspect the tie rod ends and boot seals.
²Inspect the brake linings.
97,500 Miles (156 000 km) or at 78 months
²Change the engine oil.
²Replace the engine oil filter.
100,000 Miles (160,000 km)
²Replace the spark plugs.
²Replace the ignition cables.
²Flush and replace engine coolant at 60 months
or 100,000 miles (160,000 km).
105,000 Miles (168 000 km) or at 84 months
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the serpentine drive belt and replace if
necessary. This maintenance is not required if the
belt was previously replaced.
0 - 8 LUBRICATION & MAINTENANCERS
MAINTENANCE SCHEDULES (Continued)

42,000 Miles (67 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Change the All Wheel Drive (AWD) overrunning
clutch and rear carrier fluid. (See the note at the end
of Schedule ± B.)
45,000 Miles (72 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the engine air cleaner element (fil-
ter). Replace as necessary.*
²Change the All Wheel Drive (AWD) power trans-
fer unit fluid. (See the note at the end of Schedule ±
B.)
²Inspect the brake linings.
48,000 Miles (77 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Drain and refill the automatic transmission fluid
and replace the filter. (See the note at the end of
Schedule ± B.)
51,000 Miles (82 000 km)
²Change the engine oil.
54,000 Miles (86 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
57,000 Miles (91 000 km)
²Change the engine oil.
²Replace the engine oil filter.
60,000 Miles (96 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Replace the engine air cleaner element (fil-
ter).
²Inspect the PCV valve and replace if neces-
sary.*
²Inspect the serpentine drive belt and replace if
necessary.
²Change the All Wheel Drive (AWD) power trans-
fer unit fluid. (See the note at the end of Schedule ±
B.)
²Inspect the tie rod ends and boot seals.
63,000 Miles (101 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
²Change the All Wheel Drive (AWD) overrunning
clutch and rear carrier fluid. (See the note at the end
of Schedule ± B.)
66,000 Miles (106 000 km)
²Change the engine oil.
²Replace the engine oil filter.
69,000 Miles (110 000 km)
²Change the engine oil.
²Replace the engine oil filter.
72,000 Miles (115 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
75,000 Miles (120 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the engine air cleaner element (fil-
ter) and replace as necessary.*
²Replace the spark plugs.
²Replace the ignition cables.
²Inspect the serpentine drive belt and replace if
necessary. This maintenance is not required if belt
was previously replaced.
²Change the All Wheel Drive (AWD) power trans-
fer unit fluid. (See the note at the end of Schedule ±
B.)
78,000 Miles (125 000 km)
²Change the engine oil.
²Replace the engine oil filter.
81,000 Miles (130 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
84,000 Miles (134 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Change the All Wheel Drive (AWD) overrunning
clutch and rear carrier fluid. (See the note at the end
of Schedule ± B.)
87,000 Miles (139 000 km)
²Change the engine oil.
²Replace the engine oil filter.
90,000 Miles (144 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Replace the engine air cleaner element (fil-
ter).
²Check the PCV valve and replace if neces-
sary. Not required if previously changed.*
²Inspect the serpentine drive belt and replace if
necessary. This maintenance is not required if belt
was previously replaced.
0 - 10 LUBRICATION & MAINTENANCERS
MAINTENANCE SCHEDULES (Continued)

²Replace theengine air cleaner element (fil-
ter).
²Replace thespark plugson 2.4 liter engines.
²Inspect and adjust the power steering pump belt
tension on 2.4 liter engines.
²Inspect the tie rod ends and boot seals.
37,500 Miles (60 000 km) or at 30 months
²Change the engine oil.
²Replace the engine oil filter.
45,000 Miles (72 000 km) or at 36 months
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the generator belt on 2.4 liter engines
and replace if necessary.
²Inspect the brake linings.
52,500 Miles (84 000 km) or at 42 months
²Change the engine oil.
²Replace the engine oil filter.
60,000 Miles (96 000 km) or at 48 months
²Change the engine oil.
²Replace the engine oil filter.
²Replace theengine air cleaner element (fil-
ter).
²Check thePCV valveand replace, if necessary.*
²Replace thespark plugson 2.4 liter engines.
²Inspect the power steering pump belt tension,
and replace the belt, if necessary, on 2.4 liter
engines.
²Inspect the serpentine drive belt on 3.3 liter and
3.8 liter engines, and replace if necessary.
²Inspect the tie rod ends and boot seals.
67,500 Miles (108 000 km) or at 54 months
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
75,000 Miles (120 000 km) or at 60 months
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the generator belt on 2.4 liter engines
and replace if necessary.
²Inspect the serpentine drive belt on 3.3 liter and
3.8 liter engines, and replace if necessary. This main-
tenance is not required if belt was previously
replaced.
²Flush and replace engine coolant at 60 months.
82,500 Miles (132 000 km) or at 66 months
²Change the engine oil.
²Replace the engine oil filter.
90,000 Miles (144 000 km) or at 72 months
²Change the engine oil.
²Replace the engine oil filter.
²Replace theengine air cleaner element (fil-
ter).
²Check thePCV valveand replace, if necessary.
Not required if previously changed.*
²Replace thespark plugson 2.4 liter engines.
²Inspect and adjust the power steering pump belt
tension on 2.4 liter engines.
²Inspect the generator belt on 2.4 liter engines
and replace if necessary.
²Inspect the serpentine drive belt on 3.3 liter and
3.8 liter engines, and replace if necessary. This main-
tenance is not required if belt was previously
replaced.
²Inspect the tie rod ends and boot seals.
²Inspect the brake linings.
97,500 Miles (156 000 km) or at 78 months
²Change the engine oil.
²Replace the engine oil filter.
100,000 Miles (160 000 km)
²Replace thespark plugs3.3 liter and 3.8 liter
engines.
²Replace theignition cables2.4 liter, 3.3 liter
and 3.8 liter engines.
²Flush and replace the engine coolant 60 months
or 100,000 miles (160 000 km).
105,000 Miles (168 000 km) or at 84 months
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the serpentine drive belt on 3.3 liter and
3.8 liter engines, and replace if necessary. This main-
tenance is not required if belt was previously
replaced.
²Inspect the generator belt on 2.4 liter engines
and replace if necessary.
112,500 Miles (180 000 km) or at 90 months
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
120,000 Miles (192 000 km) or at 96 months
²Change the engine oil.
²Replace the engine oil filter.
²Replace theengine air cleaner element (fil-
ter).
²Check and replace thePCV valve, if necessary.*
²Replace thespark plugs2.4 liter engines.
²Inspect the power steering pump belt tension,
replace belt if necessary on 2.4 liter engines.
0 - 12 LUBRICATION & MAINTENANCERS
MAINTENANCE SCHEDULES (Continued)

²Inspect the generator belt on 2.4 liter engines
and replace if necessary.
²Inspect the serpentine drive belt on 3.3 liter and
3.8 liter engines. Not required if replaced at 75,000,
90,000 or 105,000 miles.
²Replace theengine timing belton 2.4 liter
engine only.
²Inspect the tie rod ends and boot seals.
* This maintenance is recommended by Daimler-
Chrysler Corporation to the owner but is not
required to maintain the emissions warranty.
Inspection and service should also be performed
anytime a malfunction is observed or suspected.
Retain all receipts.
SCHEDULE±B±DODGE VEHICLES, CHRYSLER
VOYAGER
Follow this schedule if the vehicle is usually oper-
ates under one or more of the following conditions.
²Frequent short trips of less than 5 miles
²Frequent driving in dusty conditions
²Frequent trailer towing
²Day and night temperatures are below freezing
²Frequent stop and go driving
²Extensive periods of idling
²Frequent operation at sustained high speeds
during hot weather, above 90ÉF (32ÉC)
²Use of E-85 (ethanol) fuel in 3.3 liter engines.
3,000 Miles (5 000 km)
²Change the engine oil.
²Replace the engine oil filter.
6,000 Miles (10 000 km)
²Change the engine oil.
²Replace the engine oil filter.
9,000 Miles (14 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
12,000 Miles (19 000 km)
²Change the engine oil.
²Replace the engine oil filter.
15,000 Miles (24 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect theengine air cleaner element (fil-
ter).Replace as necessary.*
²Change the All Wheel Drive (AWD) power trans-
fer unit fluid. (See the note at the end of Schedule ±
B.)
²Inspect the generator belt on 2.4 liter engines
and replace if necessary.
18,000 Miles (29 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
21,000 Miles (34 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Change the All Wheel Drive (AWD) overrunning
clutch and rear carrier fluid. (See the note at the end
of Schedule ± B.)
24,000 Miles (38 000 km)
²Change the engine oil.
²Replace the engine oil filter.
27,000 Miles (43 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
30,000 Miles (48 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Replace theengine air cleaner element (fil-
ter).
²Inspect thePCV valveand replace as neces-
sary.*
²Replace thespark plugs2.4 liter engines.
²Inspect and adjust the generator belt and power
steering pump belt tension on 2.4 liter engines.
²Change the All Wheel Drive (AWD) power trans-
fer unit fluid. (See the note at the end of Schedule ±
B.)
²Inspect the tie rod ends and boot seals.
33,000 Miles (53 000 km)
²Change the engine oil.
²Replace the engine oil filter.
36,000 Miles (58 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
39,000 Miles (62 000 km)
²Change the engine oil.
²Replace the engine oil filter.
42,000 Miles (67 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Change the All Wheel Drive (AWD) overrunning
clutch and rear carrier fluid. (See the note at the end
of Schedule ± B.)
RSLUBRICATION & MAINTENANCE0-13
MAINTENANCE SCHEDULES (Continued)

45,000 Miles (72 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect theengine air cleaner element (fil-
ter).Replace as necessary.*
²Inspect the generator belt on 2.4 liter engines
and replace if necessary.
²Change the All Wheel Drive power transfer unit
fluid. (See the note at the end of Schedule ± B.)
²Inspect the brake linings.
48,000 Miles (77 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Drain and replace the automatic transmission
fluid and filter.
²Adjust bands on 3±speed transmission. (See the
note at the end of Schedule ± B.)
51,000 Miles (82 000 km)
²Change the engine oil.
²Replace the engine oil filter.
54,000 Miles (86 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
57,000 Miles (91 000 km)
²Change the engine oil.
²Replace the engine oil filter.
60,000 Miles (96 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Replace theengine air cleaner element (fil-
ter).
²Inspect thePCV valveand replace if necessary.*
²Replace thespark plugson 2.4 liter engines.
²Inspect the generator belt and power steering
pump belt tension, replace belt if necessary on 2.4
liter engines.
²Inspect the serpentine drive belt on 3.3 liter and
3.8 liter engines and replace if necessary.
²Change the All Wheel Drive (AWD) power trans-
fer unit fluid. (See the note at the end of Schedule ±
B.)
²Inspect the tie rod ends and boot seals.
63,000 Miles (101 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Change the All Wheel Drive (AWD) overrunning
clutch and rear carrier fluid. (See the note at the end
of Schedule ± B.)
²Inspect the brake linings.
66,000 Miles (106 000 km)
²Change the engine oil.
²Replace the engine oil filter.
69,000 Miles (110 000 km)
²Change the engine oil.
²Replace the engine oil filter.
72,000 Miles (115 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
75,000 Miles (120 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect theengine air cleaner element (fil-
ter)and replace as necessary.*
²Replace thespark plugs3.3 liter and 3.8 liter
engines.
²Replace theignition cables2.4 liter, 3.3 liter
and 3.8 liter engines.
²Inspect the generator belt on 2.4 liter engines
and replace if necessary.
²Inspect the serpentine drive belt on 3.3 liter and
3.8 liter engines, and replace if necessary. This main-
tenance is not required if belt was previously
replaced.
²Change the All Wheel Drive power transfer unit
fluid. (See the note at the end of Schedule ± B.)
78,000 Miles (125 000 km)
²Change the engine oil.
²Replace the engine oil filter.
81,000 Miles (130 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
84,000 Miles (134 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Change the All Wheel Drive (AWD) overrunning
clutch and rear carrier fluid. (See the note at the end
of Schedule ± B.)
87,000 Miles (139 000 km)
²Change the engine oil.
²Replace the engine oil filter.
90,000 Miles (144 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Replace theengine air cleaner element (fil-
ter).
0 - 14 LUBRICATION & MAINTENANCERS
MAINTENANCE SCHEDULES (Continued)

²Check thePCV valveand replace if necessary.
Not required if previously changed.*
²Replace thespark plugson 2.4 liter engines.
²Inspect the generator belt on 2.4 liter engines
and replace if necessary.
²Inspect the serpentine drive belt (3.3 liter and
3.8 liter engines) and replace if necessary. This main-
tenance is not required if belt was previously
replaced.
²Change the All Wheel Drive (AWD) power trans-
fer unit fluid. (See the note at the end of Schedule ±
B.)
²Inspect the tie rod ends and boot seals.
²Inspect the brake linings.
93,000 Miles (149 000 km)
²Change the engine oil.
²Replace the engine oil filter.
96,000 Miles (154 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Drain and replace the automatic transmission
fluid and filter.
²Adjust bands on 3±speed transmission. (See the
note at the end of Schedule ± B.)
99,000 Miles (158 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
100,000 Miles (160 000 km)
²Flush and replace engine coolant at 60 months
or 100,000 miles (160 000 km).
102,000 Miles (163 000 km)
²Change the engine oil.
²Replace the engine oil filter.
105,000 Miles (168 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect theengine air cleaner element (fil-
ter)and replace as necessary.*
²Inspect the generator belt on 2.4 liter engines
and replace if necessary.
²Inspect the serpentine drive belt on 3.3 liter and
3.8 liter engines and replace if necessary. This main-
tenance is not required if the belt was previously
replaced.
²Change the All Wheel Drive (AWD) power trans-
fer unit fluid. (See the note at the end of Schedule ±
B.)
²Change the All Wheel Drive (AWD) overrunning
clutch and rear carrier fluid. (See the note at the end
of Schedule ± B.)
108,000 Miles (173 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
111,000 Miles (178 000 km)
²Change the engine oil.
²Replace the engine oil filter.
114,000 Miles (182 000 km)
²Change the engine oil.
²Replace the engine oil filter.
117,000 Miles (187 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Inspect the brake linings.
120,000 Miles (192 000 km)
²Change the engine oil.
²Replace the engine oil filter.
²Replace theengine air cleaner element (fil-
ter).
²Inspect thePCV valveand replace as neces-
sary.*
²Replace thespark plugson 2.4 liter engines.
²Inspect the generator belt and power steering
pump belt tension, replace the belt if necessary on
2.4 liter engines.
²Inspect the serpentine drive belt on 3.3 liter and
3.8 liter engines. Not required if replaced at 75,000,
90,000 or 105,000 miles.
²Replace theengine timing belton 2.4 liter
engines.
²Change the All Wheel Drive (AWD) power trans-
fer unit fluid. (See the note at the end of Schedule ±
B.)
²Inspect the tie rod ends and boot seals.
* This maintenance is recommended by Daimler-
Chrysler Corporation to the owner but is not
required to maintain the emissions warranty.
NOTE: Operating the vehicle more than 50% in
heavy traffic during hot weather, above 90ÉF (32ÉC),
using vehicle for police, taxi, limousine type opera-
tion or trailer towing require the more frequent tran-
saxle service noted in Schedule ± B. Perform these
services if vehicle usually operate under these con-
ditions.
NOTE: The AWD power transfer unit fluid and the
AWD overrunning clutch/rear carrier fluid must be
changed at the more frequent intervals shown in
schedule B if the vehicle is operated under any of
the conditions noted by an asterisk at the begin-
ning of the schedule.
RSLUBRICATION & MAINTENANCE0-15
MAINTENANCE SCHEDULES (Continued)

CAUTION: Cleaning of the platinum plug may dam-
age the platinum tip.
REMOVAL
When replacing the spark plugs and spark plug
cables, route the cables correctly and secure them in
the appropriate retainers. Failure to route the cables
properly can cause the radio to reproduce ignition
noise, cross ignition of the spark plugs orshort cir-
cuit the cables to ground.
Always remove cables by grasping at the boot,
rotating the boot 1/2 turn, and pulling straight back
in a steady motion.
(1) Prior to removing the spark plug, spray com-
pressed air around the spark plug hole and the area
around the spark plug.
(2) Remove the spark plug using a quality socket
with a foam insert.
(3) Inspect the spark plug condition.
INSTALLATION
When replacing the spark plugs and spark plug
cables, route the cables correctly and secure them in
the appropriate retainers. Failure to route the cables
properly can cause the radio to reproduce ignition
noise, cross ignition of the spark plugs orshort cir-
cuit the cables to ground.(1) To avoid cross threading, start the spark plug
into the cylinder head by hand.
(2) Tighten spark plugs to 17.5 N´m (13 ft. lbs.)
torque.
(3) Install spark plug cables over spark plugs. A
click will be heard and felt when the cable properly
attaches to the spark plug.
SPARK PLUG CABLE
DESCRIPTION
Spark Plug cables are sometimes referred to as
secondary ignition wires. The wires transfer electri-
cal current from the ignition coil pack to individual
spark plugs at each cylinder. The resistive spark plug
cables are of nonmetallic construction. The cables
provide suppression of radio frequency emissions
from the ignition system.
Check the spark plug cable connections for good
contact at the coil, and spark plugs. Terminals should
be fully seated. The insulators should be in good con-
dition and should fit tightly on the coil, and spark
plugs. Spark plug cables with insulators that are
cracked or torn must be replaced.
Clean Spark Plug cables with a cloth moistened
with a non-flammable solvent. Wipe the cables dry.
Check for brittle or cracked insulation. The spark
plug cables and spark plug boots are made from high
temperature silicone materials. All spark plug cable
leads are properly identified with cylinder numbers.
The inside of most the spark plug boot is coated with
a special high temperature silicone grease for greater
sealing and to minimize boot bonding to the spark
plug insulator.
REMOVAL
Failure to route the cables properly could cause the
radio to reproduce ignition noise, cross ignition of the
spark plugs or short circuit the cables to ground.
Remove spark plug cable from coil first.
Always remove the spark plug cable by grasping
the top of the spark plug insulator, turning the boot
1/2 turn and pulling straight up in a steady motion.
INSTALLATION
Failure to route the cables properly could cause the
radio to reproduce ignition noise, cross ignition of the
spark plugs or short circuit the cables to ground.
Install spark plug insulators over spark plugs.
Ensure the top of the spark plug insulator covers the
upper end of the spark plug tube.Then connect the
other end to coil pack.
Fig. 15 Setting Spark Plug Electrode Gap
1 - TAPER GAUGE
RSIGNITION CONTROL8I-9
SPARK PLUG (Continued)

CONDITION POSSIBLE CAUSE CORRECTION
ENGINE STALLS OR IDLES
ROUGH1. Idle speed too low. 1. Test minimum air flow. (Refer to
Appropriate Diagnostic Information)
2. Incorrect fuel mixture. 2. (Refer to Appropriate Diagnostic
Information)
3. Intake manifold leakage. 3. Inspect intake manifold, manifold
gasket, and vacuum hoses.
4. Faulty ignition coil(s). 4. Test and replace as necessary.
(Refer to Appropriate Diagnostic
Information)
ENGINE LOSS OF POWER 1. Dirty or incorrectly gapped plugs. 1. Clean plugs and set gap.
2. Contamination in fuel system. 2. Clean system and replace fuel
filter.
3. Faulty fuel pump. 3. Test and replace as necessary.
(Refer to Appropriate Diagnostic
Information)
4. Incorrect valve timing. 4. Correct valve timing.
5. Leaking cylinder head gasket. 5. Replace cylinder head gasket.
6. Low compression. 6. Test compression of each
cylinder.
7. Burned, warped, or pitted valves. 7. Replace valves.
8. Plugged or restricted exhaust
system.8. Perform exhaust restriction test.
(Refer to 11 - EXHAUST SYSTEM -
DIAGNOSIS AND TESTING) Install
new parts, as necessary.
9. Faulty ignition coil(s). 9. Test and replace as necessary.
(Refer to Appropriate Diagnostic
Information)
ENGINE MISSES ON
ACCELERATION1. Dirty or incorrectly gapped spark
plugs.1. Clean spark plugs and set gap.
2. Contamination in Fuel System. 2. Clean fuel system and replace
fuel filter.
3. Burned, warped, or pitted valves. 3. Replace valves.
4. Faulty ignition coil(s). 4. Test and replace as necessary.
(Refer to Appropriate Diagnostic
Information)
ENGINE MISSES AT HIGH SPEED 1. Dirty or incorrect spark plug gap. 1. Clean spark plugs and set gap.
2. Faulty ignition coil(s). 2. Test and replace as necessary.
(Refer to Appropriate Diagnostic
Information)
3. Dirty fuel injector(s). Test and replace as necessary.
(Refer to Appropriate Diagnostic
Information)
4. Contamination in fuel system. 4. Clean system and replace fuel
filter.
9 - 6 ENGINE 2.4LRS
ENGINE 2.4L (Continued)

CONDITION POSSIBLE CAUSES CORRECTION
OIL CONSUMPTION OR SPARK
PLUGS FOULED1. PCV system malfunction. 1. Check system and repair as
necessary. (Refer to 25 -
EMISSIONS CONTROL/
EVAPORATIVE EMISSIONS/PCV
VALVE - DIAGNOSIS AND
TESTING)
2. Worn, scuffed or broken rings. 2. Hone cylinder bores. Install new
rings.
3. Carbon in oil ring slots. 3. Install new rings.
4. Rings fitted too tightly in grooves. 4. Remove rings and check
grooves. If groove is not proper
width, replace piston.
5. Worn valve guide(s). 5. Replace cylinder head assembly.
6. Valve stem seal(s) worn or
damaged.6. Replace seal(s).
STANDARD PROCEDURE - ENGINE CORE AND
OIL GALLERY PLUGS
Using a blunt tool such as a drift and a hammer,
strike the bottom edge of the cup plug. With the cup
plug rotated, grasp firmly with pliers or other suit-
able tool and remove plug (Fig. 2).
CAUTION: Do not drive cup plug into the casting as
restricted cooling can result and cause serious
engine problems.
Thoroughly clean inside of cup plug hole in cylin-
der block or head. Be sure to remove old sealer.Lightly coat inside of cup plug hole with Mopart
Stud and Bearing Mount. Make certain the new plug
is cleaned of all oil or grease. Using proper drive
plug, drive plug into hole so that the sharp edge of
the plug is at least 0.5 mm (0.020 in.) inside the
lead-in chamfer.
It is not necessary to wait for curing of the sealant.
The cooling system can be refilled and the vehicle
placed in service immediately.
STANDARD PROCEDURE - REPAIR OF
DAMAGED OR WORN THREADS
Damaged or worn threads (excluding spark plug
and camshaft bearing cap attaching threads) can be
repaired. Essentially, this repair consists of drilling
out worn or damaged threads, tapping the hole with
a special Heli-Coil Tap, (or equivalent) and installing
an insert into the tapped hole. This brings the hole
back to its original thread size.
CAUTION: Be sure that the tapped holes maintain
the original center line.
Heli-Coil tools and inserts are readily available
from automotive parts jobbers.
STANDARD PROCEDURE - HYDROSTATIC
LOCKED ENGINE
When an engine is suspected to be hydrostatically
locked, regardless of what caused the problem, the
following steps should be used.
CAUTION: DO NOT use starter motor to rotate the
engine, severe damage may occur.
Fig. 2 CORE HOLE PLUG REMOVAL
1 - CYLINDER BLOCK
2 - REMOVE PLUG WITH PLIERS
3 - STRIKE HERE WITH HAMMER
4 - DRIFT PUNCH
5 - CUP PLUG
RSENGINE 2.4L9-9
ENGINE 2.4L (Continued)

age to the valve guides.Identify valves to insure
installation in original location.
(4) Inspect the valves. (Refer to 9 - ENGINE/CYL-
INDER HEAD/VALVE SPRINGS - INSPECTION)
INSPECTION
(1) Whenever valves have been removed for inspec-
tion, reconditioning or replacement, valve springs
should be tested for correct tension. Discard the
springs that do not meet specifications. The following
specifications apply to both intake and exhaust
valves springs:
²Valve Closed Nominal TensionÐ76 lbs. @ 38.0
mm (1.50 in.)
²Valve Open Nominal TensionÐ136 lbs. @ 29.75
mm (1.17 in.)
(2) Inspect each valve spring for squareness with a
steel square and surface plate, test springs from both
ends. If the spring is more than 1.5 mm (1/16 inch)
out of square, install a new spring.
INSTALLATION - CYLINDER HEAD ON
(1) Install valve seal/valve spring seat assembly
(Fig. 35). Push the assembly down to seat it onto the
valve guide.
(2) Install valve spring and retainer, use Special
Tool MD-998772-A with adapter 6779 to compress
valve springs only enough to install locks (Fig. 34).
Correct alignment of tool is necessary to avoid nick-
ing valve stems.
(3) Remove air hose and install spark plugs.
(4) Install camshafts and cylinder head cover .
INSTALLATION - CYLINDER HEAD OFF
(1) Coat valve stems with clean engine oil and
insert in cylinder head.(2) Install new valve stem seals on all valves
using a valve stem seal tool (Fig. 36). The valve stem
seals should be pushed firmly and squarely over
valve guide.
CAUTION: When oversize valves are used, the cor-
responding oversize valve seal must also be used.
Excessive guide wear may result if oversize seals
are not used with oversize valves.
(3) Install valve springs and retainers. Compress
valve springs only enough to install locks, taking
care not to misalign the direction of compression.
Nicked valve stems may result from misalignment of
the valve spring compressor.
Fig. 34 Valve Spring - Removal/Installation
1 - VALVE SPRING COMPRESSOR MD 998772A
2 - AIR HOSEFig. 35 Valve Stem Seal/Valve Spring Seat
1 - VALVE RETAINING LOCKS
2 - VALVE SPRING
3 - VALVE SEAL AND VALVE SPRING SEAT ASSEMBLY
4 - VALVE SPRING RETAINER
Fig. 36 Valve Stem Oil Seal Tool
1 - VALVE SEAL TOOL
2 - VALVE STEM
RSENGINE 2.4L9-31
VALVE SPRINGS (Continued)