Infiniti QX4 (R50). Manual — part 432
ACCELERATOR CONTROL, FUEL &
EXHAUST SYSTEMS
CONTENTS
PREPARATION . . . . . . . . . . . . . . . ...2
Special Service Tool . . . . . . . . . . . . . 2
Commercial Service Tools . . . . . . . . . . ...2
ACCELERATOR CONTROL SYSTEM . . . . . . ...3
Removal and Installation . . . . . . . . . . . .3
Adjusting Accelerator Wire . . . . . . . . . . ..3
FUEL SYSTEM . . . . . . . . . . . . . . . . 4
Removal and Installation . . . . . . . . . . . .4
. . . . . . . . . . . . . . . ...5
. . . . . . . . . . .6
EXHAUST SYSTEM . . . . . . . . . . . . . . 8
Removal and Installation . . . . . . . . . . . .8
GI
MA
EM
LC
EC
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
Special Service Tool
NBFE0001
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.
Tool number
(Kent-Moore No.)
Tool name
Description
KV10114400 (J38365)
Heated oxygen sensor
wrench
NT636
Loosening or tightening rear heated oxy-
gen sensor (For right bank)
a: 22 mm (0.87 in)
Commercial Service Tools
NBFE0007
Tool number
(Kent-Moore No.)
Tool name
Description
Oxygen sensor thread
cleaner
(J-43897-18)
(J-43897-12)
NT778
Reconditioning the exhaust system
threads before installing a new oxygen
sensor. Use with anti-seize lubricant
shown below.
a: J-43897-18 (18 mm dia.) for Zirconia
Oxygen Sensor
b: J-43897-12 (12 mm dia.) for Titania
Oxygen Sensor
Anti-seize lubricant (Per-
matex
TM
133AR or
equivalent meeting MIL
specification MIL-A-907)
NT779
Lubricating oxygen sensor thread cleaning
tool when reconditioning exhaust system
threads.
PREPARATION
Special Service Tool
FE-2
Removal and Installation
NBFE0002
CAUTION:
I
When removing accelerator wire, make a mark to indicate lock nut’s initial position.
I
Check that throttle valve opens fully when accelerator pedal is fully depressed. Also check that it
returns to idle position when pedal is released.
I
Check accelerator control parts for improper contact with any adjacent parts.
I
When connecting accelerator wire, be careful not to twist or scratch its inner wire.
I
Refer to EL-240, “AUTOMATIC SPEED CONTROL DEVICE” for ASCD wire adjustment.
SFE635A
SEF793W
SFE249AE
Adjusting Accelerator Wire
NBFE0003
1.
Remove the vacuum hose connected to the throttle opener.
2.
Connect suitable vacuum hose to vacuum pump as shown left.
3.
Apply vacuum [more than −40.0 kPa (−300 mmHg, −11.81
inHg)] until the throttle drum becomes free from the rod of the
throttle opener.
Make sure that there is clearance between the throttle
drum and rod.
If NG, refer to EC-101, “Basic Inspection”.
If OK, go to following step.
4.
Loosen lock nut.
5.
Tighten accelerator adjusting nut until throttle drum starts to
move.
6.
From that position, turn back adjusting nut 1.5 to 2 turns, and
secure lock nut.
7.
Release vacuum from the throttle opener.
8.
Remove vacuum pump and vacuum hose from the throttle
opener.
9.
Reinstall the original vacuum hose to the throttle opener
securely.
GI
MA
EM
LC
EC
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
ACCELERATOR CONTROL SYSTEM
Removal and Installation
FE-3
Removal and Installation
NBFE0004
WARNING:
When replacing fuel line parts, be sure to observe the follow-
ing:
I
Put a “CAUTION: INFLAMMABLE” sign in workshop.
I
Do not smoke while servicing fuel system. Keep open
flames and sparks away from work area.
I
Be sure to furnish the workshop with a CO
2
fire extin-
guisher.
CAUTION:
I
Before removing fuel line parts, carry out the following
procedures:
a)
Put drained fuel in an explosion-proof container and put
lid on securely.
b)
Release fuel pressure from fuel line. Refer to MA-16,
“Changing Fuel Filter”.
c)
Disconnect battery ground cable.
I
Always replace O-ring with new ones.
I
Do not kink or twist hose and tube when they are installed.
I
Do not tighten hose clamps excessively to avoid damag-
ing hoses.
I
When installing fuel check valve, be careful of its desig-
nated direction. Refer to EC-32, “EVAPORATIVE EMIS-
SION SYSTEM”.
I
After installation, run engine and check for fuel leaks at
connections.
FUEL SYSTEM
Removal and Installation
FE-4
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