2007 INFINITI FX35 seat adjustment

EI-8
SQUEAK AND RATTLE TROUBLE DIAGNOSES
Revision: 2006 July 2007 FX35/FX45
TRUNK
Trunk noises are often caused by a loose jack or loose items put into the trunk by the owner.
In addition look for:
1. Trunk lid dumpers out of adjustment
2. Trunk lid striker out of adjustment
3. The trunk lid torsion bars knocking together
4. A loose license plate or bracket
Most of these incidents can be repaired by adjusting, securing or insulating the item(s) or component(s) caus-
ing the noise.
SUNROOF/HEADLINING
Noises in the sunroof/headlining area can often be traced to one of the following:
1. Sunroof lid, rail, linkage or seals making a rattle or light knocking noise
2. Sun-visor shaft shaking in the holder
3. Front or rear windshield touching headlining and squeaking
Again, pressing on the components to stop the noise while duplicating the conditions can isolate most of these
incidents. Repairs usually consist of insulating with felt cloth tape.
SEATS
When isolating seat noise it's important to note the position the seat is in and the load placed on the seat when
the noise is present. These conditions should be duplicated when verifying and isolating the cause of the
noise.
Cause of seat noise include:
1. Headrest rods and holder
2. A squeak between the seat pad cushion and frame
3. The rear seatback lock and bracket
These noises can be isolated by moving or pressing on the suspected components while duplicating the con-
ditions under which the noise occurs. Most of these incidents can be repaired by repositioning the component
or applying urethane tape to the contact area.
UNDERHOOD
Some interior noise may be caused by components under the hood or on the engine wall. The noise is then
transmitted into the passenger compartment.
Causes of transmitted under-hood noise include:
1. Any component mounted to the engine wall
2. Components that pass through the engine wall
3. Engine wall mounts and connectors
4. Loose radiator mounting pins
5. Hood bumpers out of adjustment
6. Hood striker out of adjustment
These noises can be difficult to isolate since they cannot be reached from the interior of the vehicle. The best
method is to secure, move or insulate one component at a time and test drive the vehicle. Also, engine RPM
or load can be changed to isolate the noise. Repairs can usually be made by moving, adjusting, securing, or
insulating the component causing the noise.

EM-2Revision: 2006 July 2007 FX35/FX45
IGNITION COIL ......................................................
... 42
Components ........................................................ ... 42
Removal and Installation ..................................... ... 42
REMOVAL ........................................................ ... 42
INSTALLATION ................................................. ... 42
SPARK PLUG (PLATINUM-TIPPED TYPE) .......... ... 43
Components ........................................................ ... 43
Removal and Installation ..................................... ... 43
REMOVAL ........................................................ ... 43
INSPECTION AFTER REMOVAL ..................... ... 43
INSTALLATION ................................................. ... 44
FUEL INJECTOR AND FUEL TUBE ..................... ... 45
Components ........................................................ ... 45
Removal and Installation ..................................... ... 45
REMOVAL ........................................................ ... 45
INSTALLATION ................................................. ... 47
INSPECTION AFTER INSTALLATION ............. ... 50
ROCKER COVER .................................................. ... 51
Components ........................................................ ... 51
Removal and Installation ..................................... ... 51
REMOVAL ........................................................ ... 51
INSTALLATION ................................................. ... 52
FRONT TIMING CHAIN CASE .............................. ... 54
Removal and Installation ..................................... ... 54
REMOVAL ........................................................ ... 54
INSTALLATION ................................................. ... 58
INSPECTION AFTER INSTALLATION ............. ... 62
TIMING CHAIN ....................................................... ... 64
Components ........................................................ ... 64
Removal and Installation ..................................... ... 65
REMOVAL ........................................................ ... 65
INSPECTION AFTER REMOVAL ..................... ... 72
INSTALLATION ................................................. ... 72
INSPECTION AFTER INSTALLATION ............. ... 82
CAMSHAFT ............................................................ ... 83
Components ........................................................ ... 83
Removal and Installation ..................................... ... 84
REMOVAL ........................................................ ... 84
INSPECTION AFTER REMOVAL ..................... ... 85
INSTALLATION ................................................. ... 88
INSPECTION AFTER INSTALLATION ............. ... 92
Valve Clearance ................................................... ... 93
INSPECTION .................................................... ... 93
ADJUSTMENT ................................................. ... 96
OIL SEAL ............................................................... ... 98
Removal and Installation of Valve Oil Seal .......... ... 98
REMOVAL ........................................................ ... 98
INSTALLATION ................................................. ... 98
Removal and Installation of Front Oil Seal .......... ... 99
REMOVAL ........................................................ ... 99
INSTALLATION ................................................. ... 99
Removal and Installation of Rear Oil Seal ........... ... 99
REMOVAL ........................................................ ... 99
INSTALLATION ................................................. .100
CYLINDER HEAD .................................................. .101
On-Vehicle Service .............................................. .101
CHECKING COMPRESSION PRESSURE ...... .101
Components ........................................................ .102 Removal and Installation ......................................
.102
REMOVAL ......................................................... .102
INSPECTION AFTER REMOVAL ..................... .103
INSTALLATION ................................................. .104
INSPECTION AFTER INSTALLATION ............. .105
Disassembly and Assembly ................................. .106
DISASSEMBLY ................................................. .106
ASSEMBLY ....................................................... .107
Inspection After Disassembly ............................... .108
VALVE DIMENSIONS ....................................... .108
VALVE GUIDE CLEARANCE ........................... .108
VALVE GUIDE REPLACEMENT ...................... .109
VALVE SEAT CONTACT ................................... .110
VALVE SEAT REPLACEMENT ......................... .110
VALVE SPRING SQUARENESS ...................... . 111
VALVE SPRING DIMENSIONS AND VALVE
SPRING PRESSURE LOAD ............................. .112
ENGINE ASSEMBLY .............................................. .113
Components (2WD Models) ................................. .113
Removal and Installation (2WD Models) .............. .113
REMOVAL ......................................................... .114
INSTALLATION ................................................. .116
INSPECTION AFTER INSTALLATION ............. .117
Components (AWD Models) ................................ .118
Removal and Installation (AWD Models) ............. .118
REMOVAL ......................................................... .119
INSTALLATION ................................................. .121
INSPECTION AFTER INSTALLATION ............. .122
CYLINDER BLOCK ................................................ .123
Components ......................................................... .123
Disassembly and Assembly ................................. .124
DISASSEMBLY ................................................. .124
ASSEMBLY ....................................................... .129
How to Select Piston and Bearing ....................... .136
DESCRIPTION ................................................. .136
HOW TO SELECT PISTON .............................. .136
HOW TO SELECT CONNECTING ROD BEAR-
ING .................................................................... .137
HOW TO SELECT MAIN BEARING ................. .138
Inspection After Disassembly ............................... .141
CRANKSHAFT END PLAY ............................... .141
CONNECTING ROD SIDE CLEARANCE ........ .141
PISTON TO PISTON PIN OIL CLEARANCE .... .141
PISTON RING SIDE CLEARANCE .................. .142
PISTON RING END GAP ................................. .142
CONNECTING ROD BEND AND TORSION .... .143
CONNECTING ROD BIG END DIAMETER ..... .143
CONNECTING ROD BUSHING OIL CLEAR-
ANCE ................................................................ .143
CYLINDER BLOCK DISTORTION ................... .144
MAIN BEARING HOUSING INNER DIAMETER .145
PISTON TO CYLINDER BORE CLEARANCE . .145
CRANKSHAFT MAIN JOURNAL DIAMETER .. .146
CRANKSHAFT PIN JOURNAL DIAMETER ..... .147
CRANKSHAFT OUT-OF-ROUND AND TAPER .147
CRANKSHAFT RUNOUT ................................. .147
CONNECTING ROD BEARING OIL CLEAR-

EM-4Revision: 2006 July 2007 FX35/FX45
ROCKER COVER ..................................................
.200
Components ........................................................ .200
Removal and Installation ..................................... .200
REMOVAL ........................................................ .200
INSTALLATION ................................................. .202
TIMING CHAIN ....................................................... .203
Components ........................................................ .203
Removal and Installation ..................................... .204
REMOVAL ........................................................ .204
INSPECTION AFTER REMOVAL ..................... .208
INSTALLATION ................................................. .208
INSPECTION AFTER INSTALLATION ............. .214
CAMSHAFT ............................................................ .215
Components ........................................................ .215
Removal and Installation ..................................... .215
REMOVAL ........................................................ .215
INSPECTION AFTER REMOVAL ..................... .216
INSTALLATION ................................................. .219
INSPECTION AFTER INSTALLATION ............. .221
Valve Clearance ................................................... .222
INSPECTION .................................................... .222
ADJUSTMENT ................................................. .224
OIL SEAL ............................................................... .228
Removal and Installation of Valve Oil Seal .......... .228
REMOVAL ........................................................ .228
INSTALLATION ................................................. .228
Removal and Installation of Front Oil Seal .......... .229
REMOVAL ........................................................ .229
INSTALLATION ................................................. .229
Removal and Installation of Rear Oil Seal ........... .230
REMOVAL ........................................................ .230
INSTALLATION ................................................. .230
CYLINDER HEAD .................................................. .232
On-Vehicle Service .............................................. .232
CHECKING COMPRESSION PRESSURE ...... .232
Components ........................................................ .233
Removal and Installation ..................................... .233
REMOVAL ........................................................ .233
INSPECTION AFTER REMOVAL ..................... .234
INSTALLATION ................................................. .234
Disassembly and Assembly ................................. .236
COMPONENTS ................................................ .236
DISASSEMBLY ................................................ .236
ASSEMBLY ...................................................... .237
Inspection After Disassembly .............................. .238
VALVE DIMENSIONS ....................................... .238
VALVE GUIDE CLEARANCE ........................... .239
VALVE GUIDE REPLACEMENT ...................... .239
VALVE SEAT CONTACT .................................. .241
VALVE SEAT REPLACEMENT ........................ .241
VALVE SPRING SQUARENESS ...................... .242
VALVE SPRING DIMENSIONS AND VALVE
SPRING PRESSURE LOAD ............................ .242 ENGINE ASSEMBLY ..............................................
.243
Components ......................................................... .243
Removal and Installation ...................................... .243
REMOVAL ......................................................... .243
INSTALLATION ................................................. .246
INSPECTION AFTER INSTALLATION ............. .246
CYLINDER BLOCK ................................................ .248
Components ......................................................... .248
Disassembly and Assembly ................................. .249
DISASSEMBLY ................................................. .249
ASSEMBLY ....................................................... .253
How to Select Piston and Bearing ....................... .258
DESCRIPTION ................................................. .258
HOW TO SELECT PISTON .............................. .259
HOW TO SELECT CONNECTING ROD BEAR-
ING .................................................................... .260
HOW TO SELECT MAIN BEARING ................. .261
Inspection After Disassembly ............................... .265
CRANKSHAFT END PLAY ............................... .265
CONNECTING ROD SIDE CLEARANCE ........ .265
PISTON TO PISTON PIN OIL CLEARANCE .... .265
PISTON RING SIDE CLEARANCE .................. .266
PISTON RING END GAP ................................. .266
CONNECTING ROD BEND AND TORSION .... .267
CONNECTING ROD BIG END DIAMETER ..... .267
CONNECTING ROD BUSHING OIL CLEAR-
ANCE ................................................................ .267
CYLINDER BLOCK DISTORTION ................... .268
MAIN BEARING HOUSING INNER DIAMETER .269
PISTON TO CYLINDER BORE CLEARANCE . .269
CRANKSHAFT MAIN JOURNAL DIAMETER .. .270
CRANKSHAFT PIN JOURNAL DIAMETER ..... .271
CRANKSHAFT OUT-OF-ROUND AND TAPER .271
CRANKSHAFT RUNOUT ................................. .271
CONNECTING ROD BEARING OIL CLEAR-
ANCE ................................................................ .272
MAIN BEARING OIL CLEARANCE .................. .273
CRUSH HEIGHT OF MAIN BEARING ............. .274
CRUSH HEIGHT OF CONNECTING ROD
BEARING .......................................................... .274
DRIVE PLATE ................................................... .274
SERVICE DATA AND SPECIFICATIONS (SDS) ... .275
Standard and Limit ............................................... .275
GENERAL SPECIFICATIONS .......................... .275
DRIVE BELTS ................................................... .275
INTAKE MANIFOLD AND EXHAUST MANI-
FOLD ................................................................ .275
SPARK PLUG ................................................... .276
CAMSHAFT AND CAMSHAFT BEARING ........ .276
CYLINDER HEAD ............................................. .278
CYLINDER BLOCK ........................................... .281
PISTON, PISTON RING AND PISTON PIN ..... .282
CONNECTING ROD ......................................... .283
CRANKSHAFT .................................................. .284
MAIN BEARING ................................................ .286
CONNECTING ROD BEARING ........................ .287

FFD-10
FRONT OIL SEAL
Revision: 2006 July 2007 FX35/FX45
INSTALLATION
1. Apply multi-purpose grease to front oil seal lips.
2. Using the drifts, install front oil seal as shown in figure.
CAUTION:

Do not reuse oil seal.

When installing, do not incline oil seal.
3. Align the matching mark (B) of drive pinion with the matching mark (A) of companion flange, and then install the companion
flange (1).
4. Apply anti-corrosion oil to the thread and seat of new drive pin- ion lock nut, and temporarily tighten drive pinion lock nut to drive
pinion.
CAUTION:
Do not reuse drive pinion lock nut.
5. Tighten to drive pinion lock nut, while adjust total preload torque.
CAUTION:

Adjust to the lower limit of the drive pinion lock nut tight-
ening torque first.

After adjustment, rotate drive pinion back and forth 2 to 3
times to check for unusual noise, rotation malfunction,
and other malfunctions.

If measured value is out of the specification, remove final
drive assembly and disassemble drive pinion parts to check
and adjust each part. Refer to FFD-13, "
Removal and Installa-
tion (VQ35DE Models)" ,FFD-15, "Removal and Installation (VK45DE Models)" and FFD-17, "Disas-
sembly and Assembly" .
6. Install front propeller shaft. Refer to PR-5, "
Removal and Installation" .
7. Install side shaft assembly.
8. Install front drive shaft both. Refer to FAX-15, "
Removal and Installation (Left Side)" , FAX-16, "Removal
and Installation (Right Side)" .
9. Refill gear oil to the final drive and check oil level. Refer to FFD-8, "
FILLING" .
10. Check the final drive for oil leakage. Refer to FFD-8, "
OIL LEAKAGE AND OIL LEVEL" .
Tool number A: ST33400001 (J-26082)
B: KV38102510 ( — )
PDIA0786J
PDIA0783J
Tool number A: ST3127S000 (J-25765-A)
Drive pinion lock nut tightening torque: 127.4 - 245.0 N·m (13.0 - 25.0 kg-m, 94 - 181 ft-lb)
Total preload torque: 1.56 - 2.65 N·m (0.16 - 0.27 kg-m, 14 - 23 in-lb)
PDIA0969E

FFD-34
FRONT FINAL DRIVE ASSEMBLY
Revision: 2006 July 2007 FX35/FX45
10. Install companion flange (1).
NOTE:
When reusing drive pinion, align the matching mark (B) of drive
pinion with the matching mark (A) of companion flange, and then
install companion flange (1).
11. Apply anti-corrosion oil to the thread and seat of new drive pin- ion lock nut, and temporarily tighten drive pinion lock nut to drive
pinion.
CAUTION:
Do not reuse drive pinion lock nut.
12. Tighten to drive pinion lock nut, while adjust pinion bearing pre- load torque.
CAUTION:

Adjust to the lower limit of the drive pinion lock nut tight-
ening torque first.

After adjustment, rotate drive pinion back and forth 2 to 3
times to check for unusual noise, rotation malfunction,
and other malfunctions.
13. Install differential case assembly. Refer to FFD-34, "
Differential
Assembly" .
CAUTION:
Do not install carrier cover yet.
14. Check and adjust drive gear runout, tooth contact, drive gear to drive pinion backlash, and companion flange runout. Refer to FFD-21, "
Drive Gear Runout" , FFD-21, "Tooth Contact" , FFD-23, "Backlash" ,
FFD-23, "
Companion Flange Runout" .
Recheck above items. Readjust the above description, if necessary.
15. Check total preload torque. Refer to FFD-20, "
Total Preload Torque" .
16. Install carrier cover. Refer to FFD-24, "
Differential Assembly" .
Differential Assembly
1. Install side gear thrust washers with the same thickness as the
ones installed prior to disassembly or reinstall the old ones on
the side gears.
PDIA0799J
Tool number A: ST3127S000 (J-25765-A)
Drive pinion lock nut tightening torque:
127.4 - 245.0 N·m (13.0 - 25.0 kg-m, 94 - 181 ft-lb)
Pinion bearing preload: 0.78 - 1.57 N·m (0.08 - 0.16 kg-m, 7 - 13 in-lb)
PDIA0802J
SDIA0193J

GW-8
SQUEAK AND RATTLE TROUBLE DIAGNOSES
Revision: 2006 July 2007 FX35/FX45
TRUNK
Trunk noises are often caused by a loose jack or loose items put into the trunk by the owner.
In addition look for:
1. Trunk lid dumpers out of adjustment
2. Trunk lid striker out of adjustment
3. The trunk lid torsion bars knocking together
4. A loose license plate or bracket
Most of these incidents can be repaired by adjusting, securing or insulating the item(s) or component(s) caus-
ing the noise.
SUNROOF/HEADLINING
Noises in the sunroof/headlining area can often be traced to one of the following:
1. Sunroof lid, rail, linkage or seals making a rattle or light knocking noise
2. Sunvisor shaft shaking in the holder
3. Front or rear windshield touching headlining and squeaking
Again, pressing on the components to stop the noise while duplicating the conditions can isolate most of these
incidents. Repairs usually consist of insulating with felt cloth tape.
SEATS
When isolating seat noise it's important to note the position the seat is in and the load placed on the seat when
the noise is present. These conditions should be duplicated when verifying and isolating the cause of the
noise.
Cause of seat noise include:
1. Headrest rods and holder
2. A squeak between the seat pad cushion and frame
3. The rear seatback lock and bracket
These noises can be isolated by moving or pressing on the suspected components while duplicating the con-
ditions under which the noise occurs. Most of these incidents can be repaired by repositioning the component
or applying urethane tape to the contact area.
UNDERHOOD
Some interior noise may be caused by components under the hood or on the engine wall. The noise is then
transmitted into the passenger compartment.
Causes of transmitted underhood noise include:
1. Any component mounted to the engine wall
2. Components that pass through the engine wall
3. Engine wall mounts and connectors
4. Loose radiator mounting pins
5. Hood bumpers out of adjustment
6. Hood striker out of adjustment
These noises can be difficult to isolate since they cannot be reached from the interior of the vehicle. The best
method is to secure, move or insulate one component at a time and test drive the vehicle. Also, engine RPM
or load can be changed to isolate the noise. Repairs can usually be made by moving, adjusting, securing, or
insulating the component causing the noise.

IDX-5
A
C
D E
F
G H
I
J
K L
B
IDX
ALPHABETICAL INDEX
EC-844
Heated seat .......................................................
SE-94
Heater and cooling unit (Heater core) ........... ATC-125
HFC134a (R134a) system precaution ............... ATC-6
HFC134a (R134a) system service procedure ATC-137
HFC134a (R134a) system service tools .......... ATC-18
HFC134a system service equipment precaution ..........
ATC-13
High and low reverse clutch solenoid valve .... AT-158,
AT-160
Hood ................................................................... BL-13
How to erase DTC for OBD system ..... EC-58, EC-728
HSEAT - Wiring diagram ................................... SE-95
I
IATS - Wiring diagram ....................... EC-206
, EC-877
ICC - Wiring diagram ....................................... ACS-21
ICC/BS - Wiring diagram ................. EC-532, EC-1208
ICC/SW - Wiring diagram ................ EC-517, EC-1193
ICCBOF - Wiring diagram ................ EC-643, EC-1325
Idle air volume learning ....................... EC-83, EC-745
Idle speed .............................. EC-81, EC-738, EC-743
Idle speed control (ISC) .... EC-467, EC-469, EC-1135,
EC-1137
Ignition coil ....................................... EC-650, EC-1332
Ignition coil(VK45DE) ...................................... EM-191
Ignition coil(VQ35DE) ........................................ EM-42
Ignition control system ..................... EC-650, EC-1332
Ignition timing ........................ EC-81, EC-738, EC-743
IGNSYS - Wiring diagram ................ EC-651, EC-1333
In vehicle sensor ........................... ATC-106, ATC-117
INF/D - Wring diagram ....................................... AV-57
INJECT - Wiring diagram ................. EC-630, EC-1312
Injector ........................................................... EC-1311
Input clutch solenoid valve ................. AT-146, AT-148
Instrument panel .................................................. IP-10
Intake air temperature sensor ........... EC-204, EC-224,
EC-875
, EC-896
Intake door control linkage adjustment ............ ATC-76
Intake door motor ........................... ATC-74, ATC-123
Intake manifold collector(VQ35DE) ................... EM-19
Intake manifold(VK45DE) ................................ EM-179
Intake manifold(VQ35DE) .................................. EM-24
Intake sensor ................................ ATC-112, ATC-119
Intake valve timing control (Bank 1) .. EC-160, EC-825
Intake valve timing control (Bank 2) .. EC-160, EC-825
Intake valve timing control position sensor (Bank 1) ....
EC-1161
Intake valve timing control position sensor (Bank 2) ....
EC-1161
Intake valve timing control solenoid valve (Bank 1) ......
EC-180
, EC-852
Intake valve timing control solenoid valve (Bank 2) ......
EC-180
, EC-852
Integrated homelink transmitter ........................ BL-226
Intelligent cruise control (ICC) system ............... ACS-6
Interior ................................................................. EI-38
IPDM (Intelligent power distribution module engine room) .................................................................
PG-17
IVCB1 - Wiring diagram ..................... EC-181, EC-853
IVCB2 - Wiring diagram ..................... EC-183, EC-855
IVCSB1 - Wiring diagram ............................... EC-1163
IVCSB2 - Wiring diagram ............................... EC-1165
IVIS (Infiniti vehicle immobilizer system) precautions ...
GI-3
IVTB1 - Wiring diagram ................................... EC-828
IVTB2 - Wiring diagram ................................... EC-830
K
Knock sensor (KS) ........................... EC-355
, EC-1026
KS - Wiring diagram ......................... EC-356, EC-1027
L
LAN system circuit ........................................... ATC-64
Lane Departure Warning System ....................... DI-77
Laser beam aiming adjustment ....................... ACS-14
Latch (lower anchors and tether for children) system ...
SB-10
LDW .................................................................... DI-77
LDW - Wiring Diagram ........................................ DI-89
Line pressure solenoid valve ........................... AT-129
Line pressure test (A/T) ..................................... AT-54
Liquid gasket application ......................... EM-6, LU-21
Liquid gasket application(VQ35DE) ........... LU-3, CO-3
Location of electrical units ................................. PG-67
Low coast brake solenoid valve ......... AT-162, AT-164
Lubricant (R134a) A/C ..................................... ATC-27
Lubrication circuit (engine)(VK45DE) ................ LU-23
Lubrication circuit (engine)(VQ35DE) .................. LU-5
Lubrication oil A/C .......................................... ATC-160
M
M/ANT - Wiring diagram .................................... AV-49
MAFS - Wiring diagram ..... EC-190, EC-198, EC-862,
EC-870
Magnet clutch ................................. ATC-82, ATC-142
MAIN - Wiring diagram ........ EC-148, EC-813, AT-179
Maintenance (engine)(VQ35DE) ...................... MA-14
Major overhaul (Final drive) .............. FFD-17, RFD-18
Major overhaul (Transfer) .................................. TF-45
Malfunction indicator lamp (MIL) .......... EC-67, EC-730
Mass air flow sensor (MAFS) ............ EC-187, EC-196,
EC-859
, EC-868
Meter ..................................................................... DI-5
METER - Wiring diagram .................................... DI-12
MIL data link connectors circuit ....... EC-673, EC-1364
MIL/DL - Wiring diagram .................. EC-673, EC-1364
Mirror, door ....................................................... GW-98
Mirror, out side .................................................. GW-98
Misfire .............................................. EC-345, EC-1016
MMSW - Wiring diagram .................................. AT-167
Mode door control linkage adjustment ............. ATC-70
Mode door motor ............................ ATC-68, ATC-130
Molding - See Exterior ................... EI-25, EI-30, EI-33

SQUEAK AND RATTLE TROUBLE DIAGNOSES IP-7
C
D E
F
G H
J
K L
M A
B
IP
Revision: 2006 July 2007 FX35/FX45
TRUNK
Trunk noises are often caused by a loose jack or loose items put into the trunk by the owner.
In addition look for:
1. Trunk lid dumpers out of adjustment
2. Trunk lid striker out of adjustment
3. The trunk lid torsion bars knocking together
4. A loose license plate or bracket
Most of these incidents can be repaired by adjusting, securing or insulating the item(s) or component(s) caus-
ing the noise.
SUNROOF/HEADLINING
Noises in the sunroof/headlining area can often be traced to one of the following:
1. Sunroof lid, rail, linkage or seals making a rattle or light knocking noise
2. Sunvisor shaft shaking in the holder
3. Front or rear windshield touching headlining and squeaking
Again, pressing on the components to stop the noise while duplicating the conditions can isolate most of these
incidents. Repairs usually consist of insulating with felt cloth tape.
SEATS
When isolating seat noise it's important to note the position the seat is in and the load placed on the seat when
the noise is present. These conditions should be duplicated when verifying and isolating the cause of the
noise.
Cause of seat noise include:
1. Headrest rods and holder
2. A squeak between the seat pad cushion and frame
3. The rear seatback lock and bracket
These noises can be isolated by moving or pressing on the suspected components while duplicating the con-
ditions under which the noise occurs. Most of these incidents can be repaired by repositioning the component
or applying urethane tape to the contact area.
UNDERHOOD
Some interior noise may be caused by components under the hood or on the engine wall. The noise is then
transmitted into the passenger compartment.
Causes of transmitted underhood noise include:
1. Any component mounted to the engine wall
2. Components that pass through the engine wall
3. Engine wall mounts and connectors
4. Loose radiator mounting pins
5. Hood bumpers out of adjustment
6. Hood striker out of adjustment
These noises can be difficult to isolate since they cannot be reached from the interior of the vehicle. The best
method is to secure, move or insulate one component at a time and test drive the vehicle. Also, engine RPM
or load can be changed to isolate the noise. Repairs can usually be made by moving, adjusting securing, or
insulating the component causing the noise.