Cylinder Head JEEP LIBERTY 2002 KJ / 1.G Service Manual

Component Page
Left Power Seat Motors
(Midline/Highline)................ 8Wa-80-74
Left Power Seat Switch
(Midline/Highline)................ 8Wa-80-74
Left Rear Door Ajar Switch (Base)..... 8Wa-80-74
Left Rear Door Lock Motor/Ajar Switch
(Except Base)................... 8Wa-80-74
Left Rear Door Speaker.............. 8Wa-80-75
Left Rear Power Window Motor
(Midline/Highline)................ 8Wa-80-75
Left Remote Radio Switch (Premium) . . . 8Wa-80-75
Left Side Impact Airbag Control
Module (LSIACM)................ 8Wa-80-75
Left Side Marker Lamp (Except
Built-Up-Export)................. 8Wa-80-76
Left Side Repeater Lamp
(Built-Up-Export)................ 8Wa-80-76
Left Speed Control Switch (Except Base) . 8Wa-80-76
Left Tail/Stop Lamp................ 8Wa-80-76
Left Visor/Vanity Lamp (Except Base) . . . 8Wa-80-76
License Lamp (Built-Up-Export)....... 8Wa-80-77
License Lamp (Except Built-Up-Export) . 8Wa-80-77
Line Pressure Sensor (3.7L).......... 8Wa-80-77
Low Note Horn.................... 8Wa-80-77
Manifold ABSolute Pressure Sensor.... 8Wa-80-77
Multi-Function Switch C1............ 8Wa-80-78
Multi-Function Switch C2............ 8Wa-80-78
Output Speed Sensor (3.7L).......... 8Wa-80-78
Overhead Map/Reading Lamp
(Except Base)................... 8Wa-80-78
Oxygen Sensor 1/1 Upstream......... 8Wa-80-79
Oxygen Sensor 1/2 Downstream....... 8Wa-80-79
Oxygen Sensor 2/1 Upstream (3.7L).... 8Wa-80-79
Oxygen Sensor 2/2 Downstream (3.7L) . . 8Wa-80-79
Passenger Airbag................... 8Wa-80-79
Passenger Seat Belt Switch........... 8Wa-80-80
Power Mirror Switch (Except Base)..... 8Wa-80-80
Power Outlet...................... 8Wa-80-80
Power Steering Pressure Switch....... 8Wa-80-80
Power Window Master Switch
(Midline/Highline)................ 8Wa-80-81
Powertrain Control Module-C1 (2.4L) . . . 8Wa-80-81
Powertrain Control Module-C1 (3.7L) . . . 8Wa-80-82
Powertrain Control Module-C2 (Gas) . . . 8Wa-80-82
Powertrain Control Module-C3 (Gas) . . . 8Wa-80-83
Radiator Fan Motor................. 8Wa-80-84
Radiator Fan Relay................. 8Wa-80-84
Radio C1......................... 8Wa-80-84
Radio C2......................... 8Wa-80-85
Radio C3......................... 8Wa-80-85
Radio Choke (Premium)............. 8Wa-80-85
Rear Power Outlet.................. 8Wa-80-85
Rear Power Window Switch
(Midline/Highline)................ 8Wa-80-86
Rear Wheel Speed Sensor............ 8Wa-80-86Component Page
Rear Wiper Motor.................. 8Wa-80-86
Red Brake Warning Indicator Switch . . . 8Wa-80-86
Remote Keyless Entry Module
(Except Base)................... 8Wa-80-86
Right Courtesy Lamp............... 8Wa-80-87
Right Curtain Airbag................ 8Wa-80-87
Right Cylinder Lock Switch
(Except Base)................... 8Wa-80-87
Right Door Lock Switch (Except Base) . . 8Wa-80-87
Right Fog Lamp................... 8Wa-80-87
Right Front Door Ajar Switch (Base).... 8Wa-80-88
Right Front Door Lock Motor/Ajar Switch
(Except Base)................... 8Wa-80-88
Right Front Door Speaker (Base)...... 8Wa-80-88
Right Front Door Speaker (Premium) . . . 8Wa-80-88
Right Front Impact Sensor........... 8Wa-80-88
Right Front Park/ Turn Signal Lamp . . . 8Wa-80-89
Right Front Power Window Motor
(Midline/Highline)................ 8Wa-80-89
Right Front Wheel Speed Sensor (ABS) . 8Wa-80-89
Right Headlamp (Built-Up-Export)..... 8Wa-80-89
Right Headlamp (Except Built-Up-Export). 8Wa-80-89
Right Heated Seat Assembly (Highline) . 8Wa-80-90
Right Heated Seat Switch (Highline) . . . 8Wa-80-90
Right Instrument Panel Speaker....... 8Wa-80-90
Right Leveling Motor (Built-Up-Export) . 8Wa-80-90
Right Position Lamp (Built-Up-Export) . . 8Wa-80-91
Right Power Mirror (Except Base)...... 8Wa-80-91
Right Power Seat Motors
(Midline/Highline)................ 8Wa-80-91
Right Power Seat Switch
(Midline/Highline)................ 8Wa-80-91
Right Rear Door Ajar Switch (Base).... 8Wa-80-92
Right Rear Door Lock Motor/Ajar Switch
(Except Base)................... 8Wa-80-92
Right Rear Door Speaker............ 8Wa-80-92
Right Rear Power Window Motor
(Midline/Highline)................ 8Wa-80-92
Right Remote Radio Switch (Premium) . . 8Wa-80-92
Right Side Impact Airbag Control Module
(RSIACM)...................... 8Wa-80-93
Right Side Marker Lamp
(Except Built-Up-Export)........... 8Wa-80-93
Right Side Repeater Lamp
(Built-Up-Export)................ 8Wa-80-93
Right Speed Control Switch
(Except Base)................... 8Wa-80-93
Right Tail/Stop Lamp............... 8Wa-80-93
Right Visor/Vanity Lamp (Except Base) . 8Wa-80-94
Sentry Key Immobilizer Module
(Except Base)................... 8Wa-80-94
Shifter Assembly................... 8Wa-80-94
Siren (Built-Up-Export).............. 8Wa-80-94
Speed Control Servo................ 8Wa-80-94
Sunroof Motor..................... 8Wa-80-95
KJ8W-80 CONNECTOR PIN-OUTS8Wa-80-3

BODY CONTROL MODULE C1 - GRAY 26 WAY
CAV CIRCUIT FUNCTION
16 D19 20VT/OR BODY CONTROL MODULE FLASH ENABLE
17 P101 20OR/PK FLIP-UP GLASS RELEASE SWITCH SENSE
18 - -
19 - -
20 B22 18LG/YL VEHICLE SPEED OUTPUT
21 G69 20BK/OR VTSS INDICATOR DRIVER
22 - -
23 C79 20VT/BK REAR WINDOW DEFOGGER CONTROL
24 C19 18BR A/C ON/OFF CONTROL
25 Z3 16BK/OR GROUND
26 P100 18OR/BR FLIP-UP GLASS RELEASE MOTOR DRIVER
BODY CONTROL MODULE C2 - GRAY 22 WAY
CAV CIRCUIT FUNCTION
1 Y66 20GY (EXCEPT BASE) RKE ANTENNA
2 G910 20VT/BR TAILGATE SWITCH GROUND
3- -
4 L80 20WT/DG HEADLAMP SWITCH RETURN
5 L307 20LG/OR HEADLAMP SWITCH MUX
6 G72 18DG/OR (LHD PREMIUM) RIGHT CYLINDER LOCK SWITCH MUX
6 G73 18LG/OR (RHD) RIGHT CYLINDER LOCK SWITCH MUX
7 L27 20WT/TN (EXCEPT BASE) FRONT FOG LAMP SWITCH SENSE
8 E21 20OR/RD PANEL LAMPS DIMMER SWITCH MUX
9 G72 18DG/OR (RHD) LEFT CYLINDER LOCK SWITCH MUX
9 G73 18LG/OR (LHD PREMIUM) LEFT CYLINDER LOCK SWITCH MUX
10 V52 20DG/RD FRONT WIPER SWITCH MUX
11 X10 20RD/DB (EXCEPT BASE) RADIO CONTROL MUX RETURN
12 Y66 20GY (EXCEPT BASE) RKE ANTENNA
13 - -
14 - -
15 G32 20DB/OR (EXCEPT BASE) AMBIENT TEMPERATURE SENSOR RETURN
16 - -
17 G71 18VT/YL TAILGATE CYLINDER LOCK SWITCH MUX
18 G31 20VT/LG (EXCEPT BASE) AMBIENT TEMPERATURE SENSOR SIGNAL
19 L324 20WT/LG HIGH BEAM SWITCH SENSE
20 F512 18PK/OR VEHICLE SPEED SENSOR SUPPLY
21 B12 18DG/OR VEHICLE SPEED SIGNAL
22 X20 20RD/BK (EXCEPT BASE) RADIO CONTROL MUX
BODY CONTROL MODULE C3 (PREMIUM)-6WAY
CAV CIRCUIT FUNCTION
1 Y60 RKE DATA
2 Y62 RKE SUPPLY
3 Y61 RKE PROGRAM
4 Y63 RKE GROUND
5 Y64 RKE ANTENNA (+)
6 Y65 RKE ANTENNA (-)
8Wa - 80 - 10 8W-80 CONNECTOR PIN-OUTSKJ

CONNECTOR NAME/NUMBER COLOR LOCATION FIG.
Front Wiper Motor (RHD) BK Right Side of Cowl 24
Fuel Heater (Diesel) BK Left Rear Side of Engine
Compartment19
Fuel Injector No.1 (Diesel) BK At Fuel Injector 23
Fuel Injector No.1 (Gas) BK At Fuel Injector 1
Fuel Injector No.2 (Diesel) BK At Fuel Injector 23
Fuel Injector No.2 (Gas) BK At Fuel Injector 2
Fuel Injector No.3 (Diesel) BK At Fuel Injector 23
Fuel Injector No.3 (Gas) BK At Fuel Injector 1
Fuel Injector No.4 (Diesel) BK At Fuel Injector 22
Fuel Injector No.4 (Gas) BK At Fuel Injector 2
Fuel Injector No.5 (3.7L) BK At Fuel Injector 1
Fuel Injector No.6 (3.7L) BK At Fuel Injector 2
Fuel Pressure Sensor (Diesel) Left Side of Engine 22
Fuel Pressure Solenoid (Diesel) BK Left Side of Engine 20
Fuel Pump Module LG At Fuel Tank N/S
Generator BK Left Front Side of Engine 20
Glow Plug Assembly (Diesel) Top of Engine N/S
Headlamp Leveling Switch (BUX) BK Center of Instrument Panel N/S
Heated Seat Module (Highline) GN At Left Seat N/S
High Note Horn BK Left Front Side of Engine
Compartment29
Hood Ajar Switch Right Side of Engine
Compartment25
Idle Air Control Motor BK On Throttle Body 1
Ignition Switch At Steering Column N/S
Input Speed Sensor (3.7L) BK Left Side of Transmission 5
Instrument Cluster BK Rear of Cluster N/S
Intake Air Temperature Sensor GY Left Side of Intake Manifold 1
Intrusion Sensor (BUX) BK Overhead Console N/S
Junction Block Body Control Module -
JBUnder Left Side of
Instrument PanelN/S
Junction Block C1 GY Under Left Side of
Instrument PanelN/S
Junction Block C2 GN Under Left Side of
Instrument PanelN/S
Junction Block C3 LB Under Left Side of
Instrument PanelN/S
Knock Sensor (3.7L) BK Near Fuel Injector No.5 1
Leak Detection Pump BK Near Fuel Tank N/S
Left Curtain Airbag YL Left Mid B-Pillar 35, 38
Left Cylinder Lock Switch LG In Left Front Door 41
Left Door Lock Switch BK In Left Front Door 41
Left Fog Lamp BK Left Side of Front Bumper N/S
KJ8W-91 CONNECTOR/GROUND/SPLICE LOCATION8Wa-91-5
CONNECTOR/GROUND/SPLICE LOCATION (Continued)

CONNECTOR NAME/NUMBER COLOR LOCATION FIG.
Output Speed Sensor BK Left Side of Transmission 5
Overhead Map/Courtesy Lamp BK Overhead Console N/S
Oxygen Sensor 1/1 Upstream (2.4L) BK Right Side of Engine 12
Oxygen Sensor 1/1 Upstream (3.7L) BK Lower Left Side of Engine 3
Oxygen Sensor 1/2 Downstream
(2.4L)NAT Right Side of Transmission 11, 12
Oxygen Sensor 1/2 Downstream
(3.7L)NAT Left Side of Transmission 5, 7
Oxygen Sensor 2/1 Upstream (3.7L) BK Lower Right Side of Engine 4
Oxygen Sensor 2/2 Downstream
(3.7L)NAT Right Side of Transmission 6
Park Brake Switch BK Center Console 36, 40
Passenger Airbag YL Right Side Instrument Panel N/S
Passenger Seat Belt Switch LG At Passenger Seat N/S
Power Mirror Switch WT In Left Front Door 41
Power Outlet RD Center of Instrument Panel N/S
Power Steering Pressure Switch BK Left Front Side of Engine 3, 15
Power Window Master Switch LG Center Console 36, 40
Powertrain Control Module C1 (2.4L) BK At Powertrain Control Module 13, 14
Powertrain Control Module C1 (3.7L) BK At Powertrain Control Module 8, 9, 10
Powertrain Control Module C2 WT At Powertrain Control Module 8, 9, 10, 13, 14
Powertrain Control Module C3 GY At Powertrain Control Module 31
Radiator Fan Motor BK Right Front Side of Engine
Compartment28
Radiator Fan Relay BK Left Front Side of Engine
Compartment29
Radio C1 GY Rear of Radio N/S
Radio C2 Rear of Radio N/S
Radio C3 Rear of Radio N/S
Radio Choke GY Center of Instrument Panel N/S
Rear Map/Reading Lamp BK Overhead Console N/S
Rear Power Outlet RD Right Rear Quarter Panel 44, 45, 48
Rear Power Window Switch WT Center Console 36, 40
Rear Wheel Speed Sensor BK On Rear Axle N/S
Rear Window Defogger BK At Rear Window 46
Rear Wiper Motor BK In Tailgate 46
Red Brake Warning Indicator Switch
(LHD)GY Left Rear Side of Engine
Compartment31
Red Brake Warning Indicator Switch
(RHD)GY Right Rear Side of Engine
Compartment26
Right Curtain Airbag YL Right Mid B-Pillar 34, 39
Right Cylinder Lock Switch (Except
Base)LG In Right Front Door 41
KJ8W-91 CONNECTOR/GROUND/SPLICE LOCATION8Wa-91-7
CONNECTOR/GROUND/SPLICE LOCATION (Continued)

CONNECTOR NAME/NUMBER COLOR LOCATION FIG.
Siren (BUX) Right Front Side of Engine
Compartment28
Speed Control Servo BK Right Rear Side of Engine
Compartment27
Sunroof Motor LG Overhead Console N/S
Sunroof Switch BK Overhead Console N/S
Tailgate Cylinder Lock Switch LG In Tailgate 46
Tailgate Flip-Up Ajar Switch GY In Tailgate 46
Tailgate Lock Motor/Ajar Switch BK In Tailgate 46
Throttle Position Sensor WT On Throttle Body 1
Trailer Tow Brake Lamp Relay Right Quarter Panel 47
Trailer Tow Circuit Breaker Right Quarter Panel N/S
Trailer Tow Connector BK At Trailer Hitch 47, 48
Trailer Tow Right Turn Relay Right Quarter Panel 47
Trailer Tow Relay Right Quarter Panel 47
Trailer Tow Left Turn Relay Right Quarter Panel 47
Transfer Case Position Sensor BK Rear Side of Transmission 5, 7, 11, 12, 22
Transmission Control Module (3.7L)
(LHD)BK Right Rear Side of Engine
Compartment8, 9
Transmission Control Module (3.7L)
(RHD)BK Left Rear Side of Engine
Compartment10
Transmission Solenoid/TRS
Assembly (3.7L)GY Left Side of Transmission 5
Under Hood Lamp BK Underside of Hood 24
Washer Fluid Level Switch LG At Washer Fluid Reservoir 28
Water In Fuel Sensor (Diesel) Left Rear Side of Engine
Compartment19
GROUNDS
GROUND NUMBER LOCATION FIG.
G100 Left Side of Engine Compartment 8, 9, 10, 14, 19
G101 (2.4L) Left Side of Engine Compartment 11
G102 (LHD) Right Rear Side of Engine Compartment 9
G102 (RHD) Left Rear Side of Engine Compartment 10
G103 (3.7L) Right Front Side of Engine 4
G103 (Diesel) Right Front Side of Engine 20
G104 Near Engine Control Module C2 19
G105 Left Side of Engine Compartment N/S
G106 Left Side of Engine Compartment N/S
G110 Left Side of Engine Compartment 30
G111 Left Front Side of Engine Compartment 29
G112 Left Front Side of Engine Compartment 29
G200 Near Body Control Module N/S
KJ8W-91 CONNECTOR/GROUND/SPLICE LOCATION8Wa-91-9
CONNECTOR/GROUND/SPLICE LOCATION (Continued)

ENGINE - 3.7L
TABLE OF CONTENTS
page page
ENGINE - 3.7L
DESCRIPTION..........................3
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - INTRODUCTION............4
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - PERFORMANCE............4
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - MECHANICAL..............6
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - LUBRICATION..............7
DIAGNOSIS AND TESTING - CYLINDER
COMPRESSION PRESSURE..............8
DIAGNOSIS AND TESTING - CYLINDER
COMBUSTION PRESSURE LEAKAGE.......8
STANDARD PROCEDURE
STANDARD PROCEDURE - ENGINE
GASKET SURFACE PREPARATION.........9
STANDARD PROCEDURE - REPAIR
DAMAGED OR WORN THREADS..........9
STANDARD PROCEDURE - ENGINE CORE
AND OIL GALLERY PLUGS..............10
REMOVAL.............................10
INSTALLATION.........................11
SPECIFICATIONS
TORQUE............................12
3.7L ENGINE.........................12
SPECIAL TOOLS
3.7L ENGINE.........................15
AIR CLEANER ELEMENT
REMOVAL - 3.7L........................19
INSTALLATION - 3.7L....................19
CYLINDER HEAD - LEFT
DESCRIPTION - VALVE GUIDES...........19
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - HYDRAULIC
LASH ADJUSTER.....................19
DIAGNOSIS AND TESTING - CYLINDER
HEAD GASKET.......................19
REMOVAL.............................20
CLEANING............................22
INSTALLATION.........................22
CAMSHAFT(S)
DESCRIPTION.........................23
REMOVAL.............................24
INSTALLATION.........................25
CYLINDER HEAD COVER(S)
DESCRIPTION.........................25
REMOVAL.............................25INSTALLATION.........................26
INTAKE/EXHAUST VALVES & SEATS
DESCRIPTION.........................26
STANDARD PROCEDURE - REFACING......26
REMOVAL.............................27
INSTALLATION.........................28
ROCKER ARM
DESCRIPTION.........................29
VALVE GUIDE SEALS
DESCRIPTION.........................29
VALVE SPRINGS
DESCRIPTION.........................29
REMOVAL.............................29
INSTALLATION.........................29
CYLINDER HEAD - RIGHT
DESCRIPTION
DESCRIPTION - CYLINDER HEAD........30
DESCRIPTION - VALVE GUIDES..........30
DESCRIPTION........................30
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - HYDRAULIC
LASH ADJUSTER.....................30
DIAGNOSIS AND TESTING - CYLINDER
HEAD GASKET.......................30
REMOVAL.............................31
CLEANING............................31
INSPECTION..........................32
INSTALLATION.........................32
CAMSHAFT(S)
DESCRIPTION.........................33
REMOVAL.............................33
INSTALLATION.........................33
CYLINDER HEAD COVER(S)
REMOVAL.............................34
INSTALLATION.........................34
INTAKE/EXHAUST VALVES & SEATS
STANDARD PROCEDURE - REFACING......34
REMOVAL.............................35
INSTALLATION.........................36
ROCKER ARM
DESCRIPTION.........................37
REMOVAL.............................37
INSTALLATION.........................37
VALVE GUIDE SEALS
DESCRIPTION.........................38
VALVE SPRINGS
DESCRIPTION.........................38
REMOVAL.............................38
INSTALLATION.........................38
KJENGINE - 3.7L 9 - 1

ENGINE - 3.7L
DESCRIPTION
The 3.7 liter (226 CID) six-cylinder engine is an
90É single overhead camshaft engine. The cast iron
cylinder block is made up of two different compo-
nents; the first component is the cylinder bore and
upper block, the second component is the bedplate
that comprises the lower portion of the cylinder block
and houses the lower half of the crankshaft mainbearings. The cylinders are numbered from front to
rear with the left bank being numbered 1,3,and 5
and the right bank being numbered 2,4, and 6. The
firing order is 1±6±5±4±3±2. The engine serial num-
ber is located at the right front side of the engine
block
3.7 L ENGINE
KJENGINE - 3.7L 9 - 3

DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - INTRODUCTION
Engine diagnosis is helpful in determining the
causes of malfunctions not detected and remedied by
routine maintenance.
These malfunctions may be classified as either per-
formance (e.g., engine idles rough and stalls) or
mechanical (e.g., a strange noise).
(Refer to 9 - ENGINE - DIAGNOSIS AND TEST-
ING)ÐPERFORMANCE and (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)ÐMECHANICAL for
possible causes and corrections of malfunctions.
(Refer to 14 - FUEL SYSTEM/FUEL DELIVERY -
DIAGNOSIS AND TESTING) and (Refer to 14 -
FUEL SYSTEM/FUEL INJECTION - DIAGNOSIS
AND TESTING) for the fuel system diagnosis.Additional tests and diagnostic procedures may be
necessary for specific engine malfunctions that can
not be isolated with the Service Diagnosis charts.
Information concerning additional tests and diagno-
sis is provided within the following diagnosis:
²Cylinder Compression Pressure Test (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
²Cylinder Combustion Pressure Leakage Test
(Refer to 9 - ENGINE - DIAGNOSIS AND TEST-
ING).
²Engine Cylinder Head Gasket Failure Diagnosis
(Refer to 9 - ENGINE/CYLINDER HEAD - DIAGNO-
SIS AND TESTING).
²Intake Manifold Leakage Diagnosis (Refer to 9 -
ENGINE/MANIFOLDS/INTAKE MANIFOLD -
DIAGNOSIS AND TESTING).
DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - PERFORMANCE
CONDITION POSSIBLE CAUSE CORRECTION
ENGINE WILL NOT START 1. Weak battery 1. Charge or replace as necessary.
2. Corroded or loose battery
connections.2. Clean and tighten battery
connections. Apply a coat of light
mineral grease to the terminals.
3. Faulty starter. 3. (Refer to 8 - ELECTRICAL/
STARTING - DIAGNOSIS AND
TESTING).
4. Faulty coil or control unit. 4. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION
COIL - REMOVAL).
5. Incorrect spark plug gap. 5. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/SPARK PLUG
- CLEANING).
6. Incorrect right bank cam timing. 6. Refer to engine timing in this
section.
7. Dirt or water in fuel system. 7. Clean system and replace fuel
filter.
8.Faulty fuel pump, relay or wiring. 8.Repair or replace as necessary.
9. Faulty cam or crank sensor 9. Refer to Ignition system.
ENGINE STALLS OR ROUGH IDLE 1. Vacuum leak. 1. Inspect intake manifold and
vacuum hoses, repair or replace as
necessary.
2. Faulty crank position sensor 2. Replace crank position sensor.
4. Faulty coil. 4. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION
COIL - REMOVAL).
9 - 4 ENGINE - 3.7LKJ
ENGINE - 3.7L (Continued)

CONDITION POSSIBLE CAUSE CORRECTION
5. Incorrect cam timing. 5. (Refer to 9 - ENGINE/VALVE
TIMING - STANDARD
PROCEDURE).
1. ENGINE LOSS OF POWER 1. Dirty or incorrectly gapped spark
plugs.1. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/SPARK PLUG
- CLEANING).
2. Dirt or water in fuel system. 2. Clean system and replace fuel
filter.
3. Faulty fuel pump. 3. (Refer to 14 - FUEL SYSTEM/
FUEL DELIVERY/FUEL PUMP -
DIAGNOSIS AND TESTING).
4. Blown cylinder head gasket. 4. Replace cylinder head gasket.
5. Low compression. 5. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING), repair
as necessary.
6. Burned, warped or pitted valves. 6. Replace as necessary.
7. Plugged or restricted exhaust
system.7. Inspect and replace as
necessary.
8. Faulty coil. 8. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION
COIL - REMOVAL).
9. Incorrect cam timing. 9. Refer to Engine TIming in this
section.
1. ENGINE MISSES ON
ACCELERATION1. Spark plugs dirty or incorrectly
gapped.1. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/SPARK PLUG
- CLEANING).
2. Dirt in fuel system. 2. Clean fuel system.
3. Burned, warped or pitted valves. 3. Replcae as necessary.
4. Faulty coil. 4. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION
COIL - REMOVAL).
1. ENGINE MISSES AT HIGH
SPEED1. Spark plugs dirty or incorrectly
gapped.1. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/SPARK PLUG
- CLEANING).
2. Faulty coil. 2. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION
COIL - REMOVAL).
3. Dirt or water in fuel system. 3. Clean system and replace fuel
filter.
KJENGINE - 3.7L 9 - 5
ENGINE - 3.7L (Continued)

DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - MECHANICAL
CONDITION POSSIBLE CAUSES CORRECTIONS
NOISY VALVES 1. High or low oil level in
crankcase.1. (Refer to LUBRICATION &
MAINTENANCE/FLUID TYPES -
SPECIFICATIONS).
2. Thin or diluted oil. 2. Change oil and filter.
3. Low oil pressure. 3. Check oil pump, if Ok, check rod
and main bearings for excessive
wear.
4. Dirt in lash adjusters. 4. Clean or replace as necessary.
5. Worn rocker arms. 5. Replace as necessary.
7. Worn valve guides. 7. (Refer to 9 - ENGINE/CYLINDER
HEAD/INTAKE/EXHAUST VALVES
& SEATS - STANDARD
PROCEDURE).
8. Excessive runout of valve seats
on valve faces.8. Service valves and valve seats.
(Refer to 9 - ENGINE/CYLINDER
HEAD/INTAKE/EXHAUST VALVES
& SEATS - STANDARD
PROCEDURE).
ENGINE VIBRATION 1. Counter Balance Shaft not timed
properly1. Refer to Engine Timing in this
section
CONNECTING ROD NOISE 1. Insufficient oil supply. 1. (Refer to LUBRICATION &
MAINTENANCE/FLUID TYPES -
SPECIFICATIONS).
2. Low oil pressure. 2. Check oil pump, if Ok, check rod
and main bearings for excessive
wear.
3. Thin or diluted oil. 3. Change oil and filter.
4. Excessive bearing clearance. 4. Replace as necessary.
5. Connecting rod journal
out-of-round.5. Service or replace crankshaft.
6. Misaligned connecting rods. 6. Replace bent connecting rods.
MAIN BEARING NOISE 1. Insufficient oil supply. 1. (Refer to LUBRICATION &
MAINTENANCE/FLUID TYPES -
SPECIFICATIONS).
2. Low oil pressure. 2. Check oil pump, if Ok, check rod
and main bearings for excessive
wear.
3. Thin or diluted oil. 3. Change oil and filter.
4. Excessive bearing clearance. 4. Replace as necessary.
5. Excessive end play. 5. Check thrust washers for wear.
6. Crankshaft journal out-of round. 6. Service or replace crankshaft.
7. Loose flywheel or torque
converter.7. Tighten to correct torque
9 - 6 ENGINE - 3.7LKJ
ENGINE - 3.7L (Continued)