Lexus SC300 / Lexus SC400. Manual — part 376

25. CONNECT

FUEL RETURN HOSE TO FUEL RETURN PIPE

26. CONNECT FUEL INLET HOSE TO LH DELIVERY PIPE
(a) Temporarily connect the fuel inlet hose to the delivery pipe

with 2 new gaskets and pulsation damper.

(b) Install the bolt holding the fuel inlet hose to the delivery pipe.
(c) Using SST tighten the pulsation damper.

SST 09631–22020

Torque:

39 N

⋅

m (400 kgf

⋅

cm, 29 ft

⋅

lbf)

33 N

⋅

m (340 kgf

⋅

cm, 24 ft

⋅

lbf) for SST

HINT: Use a torque wrench with a fulcrum length of 30 cm
(11.81 in.).

27. INSTALL

HEATER

WATER

HOSES

Connect the following noses:
(1) Water hose to water bypass pipe
(2) Water hose to rear water bypass joint

28. INSTALL AIR INTAKE CHAMBER
(a) Install

the cold start injector, tube and lead wire assembly with

the 3 bolts.

Torque: 7.8 N

⋅

m (80 kgf

⋅

cm, 69 in.

⋅

lbf)

(b) Place 4 new gaskets on the intake manifold.

HINT: Gaskets can only be used twice before being replaced.

(c) Place the air intake chamber on the intake manifold.

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(d) Install a new gasket to the EGR pipe.
(e) Temporarily connect the EGR pipe to the air intake chamber

with the 2 bolts.
HINT: Use bolt 20 mm (0.79 in.) in length.

(f)

Temporarily install the air intake and and following parts with
the 4 bolts and 8 nuts:
(1)

VSV for fuel pressure control

(2)

Except California:
VSV for EGR

(3)

Transmission throttle cable bracket

(4)

DLC1

(g) Uniformly tighten the bolts and nuts several passes.

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

HINT: Use bolt 40 mm (1.57 in.) in length.

(h) Tighten the 2 bolts holding the EGR pipe to the air intake

chamber.

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

(i) Tighten the bolt holding the EGR pipe to the RH cylinder

head.

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

(j)

Connect the cold start injector tube to the RH delivery pipe
with 2 new gaskets and the union bolt.

Torque: 15 N

⋅

m (150 kgf

⋅

cm, 11 ft

⋅

lbf)

(k) Connect the following connectors:

•

Cold start injector connector

•

VSV connector for fuel pressure control

•

Except California:
VSV connector for EGR

EG–128

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ENGINE MECHANICAL

(l)

Install the accelerator bracket with the bolt and stud bolt.

(m) Install 2 new gaskets and union with the union bolt.

Torque: 29 N

⋅

m (300 kgf

⋅

cm, 22 ft

⋅

lbf)

(n) Connect the following hoses:

(1)

Brake booster vacuum hose to union on air intake cham-
ber

(2)

Vacuum hose (from VSV for heater water valve to air in-
take chamber

29. INSTALL THROTTLE BODY
(a) Disconnect the following hoses:

(1)

PCV hose to throttle body

(2)

Water bypass hose to throttle body

(b) Install a new gasket and throttle body with the 2 bolts and 2

nuts.

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

HINT: Use bolt 40 mm (1.57 in.) in length.

(c) Install the water bypass pipe (from the rear bypass joint) to

the clamp on the engine wire cover.

(d) Connect the following connectors:

(1)

Throttle position sensor connector

(2)

w/ TRAC:

Sub–throttle position sensor connector

(3)

w/ TRAC:

Sub–throttle actuator connector

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30. INSTALL

HEATER

WATER

VALVE

(a) Install the water valve and bracket assembly with the 2 bolts.
(b) Install the engine wire with the bolt.
(c) Connect the VSV connector.

31. INSTALL IAC VALVE
(a) Install a new gasket and IAC valve with the 2 nuts.

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

(b) Connect

the water bypass hose (from the throttle body) to the

IAC valve.

(c) Connect the IAC valve connector.

32. INSTALL EGR VALVE ADAPTOR
(a) Install a new gasket, the EGR valve adaptor and EGR gas

temperature sensor connector bracket with the 2 bolts and 2
nuts.

Torque: 18 N

⋅

m (185 kgf

⋅

cm, 13 ft

⋅

lbf)

HINT: Use bolt 20 mm (0.78 in.) in length.

NOTICE: Do not touch the air intake chamber and adaptor sur-

faces of the gasket with your hand.

(b) Connect the PCV hose to the cylinder head.
(c) Connect the EGR gas temperature sensor connector.

EG–130

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ENGINE MECHANICAL