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NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
[VQ35HR]
< SYMPTOM DIAGNOSIS >
2. Confirm the type of noise.
3. Specify the operating condition of the engine.
4. Check specified noise source.
If necessary, repair or replace these parts.
Operating condition of engine
Location
of noise
Type of
noise
Top of engine
Rocker
cover
Cylinder
head
Front of
engine
Timing
chain case
Front of
engine
Reference page
After
warmup
When
starting
When
idling
When
racing
While
driving
Ticking or
clicking
C
A
—
A
B
—
Tappet
noise
Valve clearance
Rattle
C
A
—
A
B
C
Camshaft
bearing
noise
Camshaft runout
Camshaft journal oil
clearance
—
Piston pin
noise
Piston to piston pin oil
clearance
Connecting rod bushing
oil clearance
EM-147
A
Piston
slap noise
Piston to cylinder bore
clearance
Piston ring side clearance
Piston ring end gap
Connecting rod bend
and torsion
EM-147
Connecting rod bushing
oil clearance
Connecting rod bearing
oil clearance
Slap or
knock
Crankshaft pulley
Cylinder
block
(Side of
engine)
Oil pan
Source of
noise
Before
warmup
Slap or
rap
—
A
A
—
—
—
B
B
B
B
Check item
EM-20
Knock
A
B
C
B
B
B
Connecting rod
bearing
noise
Knock
A
B
—
A
B
C
Main bearing oil clearMain bearance
ing noise
Crankshaft runout
B
Timing
chain and
timing
chain tensioner
noise
Timing chain cracks
and wears
Timing chain tensioner
operation
C
Drive belt
(Sticking
or slipping)
Drive belt deflection
Tapping or
ticking
A
A
—
B
B
Squeaking or fizzing
A
Creaking
A
B
A
B
A
B
Drive belt
(Slipping)
Idler pulley bearing operation
Squall
Creak
A
B
—
B
A
B
Water
pump
noise
Water pump operation
B
—
A: Closely related B: Related C: Sometimes related
Revision: 2009 March
B
—
EM-143
EM-147
EM-152
EM-151
EM-147
EM-68
EM-54
EM-15
CO-19
—: Not related
EM-6
2009 FX35/FX50