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EM-14
[VQ35DE]
NOISE, VIBRATION AND HARSHNESS (NVH) TROUBLESHOOTING
Revision: 2004 November 2004 FX35/FX45
Use the Chart Below to Help You Find the Cause of the Symptom. ABS004TW
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.
A: Closely related B: Related C: Sometimes related —: Not related
Location
of noise
Type of
noise
Operating condition of engine
Source of
noise
Check item
Refer-
ence page
Before
warm-
up
After
warm-
up
When
start-
ing
When
idling
When
racing
While
driving
Top of
engine
Rocker
cover
Cylinder
head
Ticking or
clicking
CA—AB—
Tappet
noise
Valve clearance EM-89
Rattle C A — A B C
Camshaft
bearing
noise
Camshaft runout
Camshaft journal oil
clearance
EM-84
EM-84
Crank-
shaft pul-
ley
Cylinder
block
(Side of
engine)
Oil pan
Slap or
knock
—A—BB—
Piston pin
noise
Piston to piston pin oil
clearance
Connecting rod bush-
ing oil clearance (Small
end)
EM-136
EM-138
Slap or
rap
A——BBA
Piston
slap noise
Piston to cylinder bore
clearance
Piston ring side clear-
ance
Piston ring end gap
Connecting rod bend
and torsion
EM-140
EM-137
EM-137
EM-138
Knock A B C B B B
Connect-
ing rod
bearing
noise
Connecting rod bush-
ing oil clearance (Small
end)
Connecting rod bear-
ing housing diameter
(Big end)
EM-138
EM-138
Knock A B — A B C
Main
bearing
noise
Main bearing oil clear-
ance
Crankshaft runout
EM-143
EM-142
Front of
engine
Timing
chain
case
Tapping or
ticking
AA—BBB
Timing
chain and
chain ten-
sioner
noise
Timing chain cracks
and wear
Timing chain tensioner
operation
EM-71
Front of
engine
Squeak-
ing or fizz-
ing
AB—B—C
Drive belts
(Sticking
or slip-
ping)
Drive belts deflection
EM-15
CreakingABABAB
Drive belts
(Slipping)
Idler pulley bearing
operation
Squall
Creak
AB—BAB
Water
pump
noise
Water pump operation
CO-22,
"WATER
PUMP"
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