Infiniti FX35, FX50 (S51). Manual - part 933

EM-32

< REMOVAL AND INSTALLATION >

[VQ35HR]

INTAKE MANIFOLD COLLECTOR

CAUTION:

• Perform this step when engine is cold.
• Never spill engine coolant on drive belt.

b.

Disconnect water hoses from electric throttle control actuator. When engine coolant is not drained from
radiator, attach plug to water hoses to prevent engine coolant leakage.

c.

Disconnect harness connector.

d.

Loosen mounting bolts in reverse order as shown in the figure.
NOTE:
• When removing only intake manifold collector, move electric

throttle control actuator without disconnecting the water hose.

• The figure shows the electric throttle control actuator (bank 1)

viewed from the air duct side.

• Viewed from the air duct side, order of loosening mounting

bolts of electric throttle control actuator (bank 2) is the same
as that of the electric throttle control actuator (bank 1).

CAUTION:

Handle carefully to avoid any impact to electric throttle con-
trol actuator.

4.

Disconnect vacuum hose, PCV hose and EVAP hose from intake manifold collector.

5.

Remove EVAP canister purge volume control solenoid valve and EVAP tube assembly from intake mani-
fold collector.

6.

Loosen mounting bolts and nuts with power tool in the reverse
order as shown in the figure to remove intake manifold collector.

INSTALLATION

Note the following item, and install in the reverse order of removal.

INTAKE MANIFOLD COLLECTOR 

• If stud bolts were removed, install them and tighten to the specified torque below.

• Tighten mounting bolts and nuts in numerical order as shown in the

figure.

WATER HOSE

• Insert hose by 27 to 32 mm (1.06 to 1.26 in) from connector end.
• Clamp hose at location of 3 to 7 mm (0.12 to 0.28 in) from hose end.

ELECTRIC THROTTLE CONTROL ACTUATOR (BANK 1 AND BANK 2)

JPBIA0011ZZ

: Engine front

JPBIA0012ZZ

: 10.8 N·m (1.1 kg-m, 8 ft-lb)

: Engine front

JPBIA0012ZZ

INTAKE MANIFOLD COLLECTOR

EM-33

< REMOVAL AND INSTALLATION >

[VQ35HR]

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• Tighten in numerical order as shown in the figure.

NOTE:
• The figure shows the electric throttle control actuator (bank 1)

viewed from the air duct side.

• Viewed from the air duct side, order of tightening mounting bolts

of electric throttle control actuator (bank 2) is the same as that of
the electric throttle control actuator (bank 1).

• Perform the “Throttle Valve Closed Position Learning” when har-

ness connector of electric throttle control actuator is disconnected.
Refer to 

EC-25, "THROTTLE VALVE CLOSED POSITION

LEARNING : Description"

.

• Perform the “Idle Air Volume Learning” and “Throttle Valve Closed

Position Learning” when electric throttle control actuator is replaced. Refer to 

EC-25, "IDLE AIR VOLUME

LEARNING : Description"

 and 

EC-25, "THROTTLE VALVE CLOSED POSITION LEARNING : Description"

.

JPBIA0011ZZ

EM-34

< REMOVAL AND INSTALLATION >

[VQ35HR]

INTAKE MANIFOLD

INTAKE MANIFOLD

Exploded View

INFOID:0000000005245132

Removal and Installation

INFOID:0000000005245133

REMOVAL

1.

Release fuel pressure. Refer to 

EC-566, "Inspection"

.

2.

Remove intake manifold collector. Refer to 

EM-31, "Exploded View"

.

3.

Remove fuel tube and fuel injector assembly. Refer to 

EM-40, "Exploded View"

.

4.

Remove harness bracket.

5.

Loosen mounting bolts and nuts in reverse order as shown in
the figure to remove intake manifold with power tool.

CAUTION:

• Cover engine openings to avoid entry of foreign materi-

als.

• Put a mark on the intake manifold and the cylinder head

with paint before removal because they need installed in
the specified direction. 

6.

Remove gaskets.

INSTALLATION

Note the following item, and install in the reverse order of removal.

INTAKE MANIFOLD

• If stud bolts were removed, install them and tighten to the specified torque below.

1.

Harness bracket

2.

Intake manifold

3.

Gasket

A.

Refer to 

EM-34

Refer to 

GI-4, "Components"

 for symbols in the figure.

PBIC5453E

: Engine front

JPBIA0013ZZ

: 10.8 N·m (1.1 kg-m, 8 ft-lb)

INTAKE MANIFOLD

EM-35

< REMOVAL AND INSTALLATION >

[VQ35HR]

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• Tighten all mounting bolts and nuts to the specified torque in two or

more steps in numerical order as shown in the figure.

CAUTION:

Install intake manifold with the marks (put on the intake mani-
fold and the cylinder head before removal) aligned.

Inspection

INFOID:0000000005245134

INSPECTION AFTER REMOVAL

Surface Distortion

• Check the surface distortion of the intake manifold mating surface

with a straightedge (A) and a feeler gauge (B).

• If it exceeds the limit, replace intake manifold.

: Engine front

1st step:

: 7.4 N·m (0.75 kg-m, 5 ft-lb)

2nd step and after:

: 25.5 N·m (2.6 kg-m, 19 ft-lb)

JPBIA0013ZZ

Limit

: Refer to 

EM-143, "Intake Manifold"

.

JPBIA0015ZZ