Infiniti I35 (A33). Manual - part 479

NHEM0005

SEM706G

GI

MA

LC

EC

FE

AT

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

EM-7

NVH Troubleshooting — Engine Noise

NHEM0005S01

Use the chart below to help you find the cause of the symptom.
1.

Locate the area where noise occurs.

2.

Confirm the type of noise.

3.

Specify the operating condition of engine.

4.

Check specified noise source.

If necessary, repair or replace these parts.

Location of

noise

Type of

noise

Operating condition of engine

Source of

noise

Check item

Reference

page

Before

warm-up

After

warm-up

When

starting

When

idling

When

racing

While

driving

Top of
engine
Rocker
cover
Cylinder
head

Ticking or
clicking

C

A

—

A

B

—

Tappet
noise

Valve clearance

EM-66

Rattle

C

A

—

A

B

C

Camshaft
bearing
noise

Camshaft journal clear-
ance
Camshaft runout

EM-56,
EM-55

Crankshaft
pulley
Cylinder
block
(Side of
engine)
Oil pan

Slap or
knock

—

A

—

B

B

—

Piston pin
noise

Piston and piston pin
clearance
Connecting rod bush-
ing clearance

EM-75,
EM-81

Slap or
rap

A

—

—

B

B

A

Piston slap
noise

Piston-to-bore clear-
ance
Piston ring side clear-
ance
Piston ring end gap
Connecting rod bend
and torsion

EM-77,
EM-75,
EM-75,
EM-76

Knock

A

B

C

B

B

B

Connect-
ing rod
bearing
noise

Connecting rod bush-
ing clearance (Small
end)
Connecting rod bearing
clearance (Big end)

EM-81,
EM-80

Knock

A

B

—

A

B

C

Main bear-
ing noise

Main bearing oil clear-
ance
Crankshaft runout

EM-78,
EM-78

Front of
engine
Timing
chain
cover

Tapping or
ticking

A

A

—

B

B

B

Timing
chain and
chain ten-
sioner
noise

Timing chain cracks
and wear
Timing chain tensioner
operation

EM-39,
EM-29

Front of
engine

Squeaking
or fizzing

A

B

—

B

—

C

Drive belts
(Sticking
or slipping)

Drive belts deflection

MA section
(“Checking
Drive
Belts”,
“ENGINE
MAINTE-
NANCE”)

Creaking

A

B

A

B

A

B

Drive belts
(Slipping)

Idler pulley bearing
operation

Squall
Creak

A

B

—

B

A

B

Water
pump
noise

Water pump operation

LC section
(“Water
Pump
Inspection”,
“ENGINE
COOLING
SYSTEM”)

A: Closely related

B: Related

C: Sometimes related

—: Not related

NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING

NVH Troubleshooting — Engine Noise

EM-8

Removal and Installation

NHEM0006

SEM707GA

1.

Electronic control throttle actuator

2.

Intake manifold upper collector

3.

EVAP canister purge volume con-
trol solenoid valve

4.

Intake manifold lower collector

5.

Power valve

6.

VIAS control solenoid valve

7.

Fuel tube

8.

Fuel damper

9.

Fuel damper

10. Vacuum tank
11. Intake manifold
12. Service port

GI

MA

LC

EC

FE

AT

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

OUTER COMPONENT PARTS

Removal and Installation

EM-9

SEM708GA

1.

Heated oxygen sensor 1 (bank 1)

2.

Exhaust manifold

3.

TWC (manifold)

4.

Thermostat with water inlet

5.

Exhaust manifold

6.

Heated oxygen sensor 1 (bank 2)

7.

TWC (manifold)

8.

Heated oxygen sensor 2 (bank 2)

9.

Water outlet

OUTER COMPONENT PARTS

Removal and Installation (Cont’d)

EM-10