Lexus SC300 / Lexus SC400. Manual — part 421
(b) Install a new gasket and throttle body with the two bolts
and two nuts.
Torque: 18 N
⋅
m (185 kgf
⋅
cm, 13 ft
⋅
lbf)
HINT: Use bolts 40 mm (1.57 in.) in length.
(c) Install the water by–pass pipe (from rear water by–pass
joint) to the clamp on the engine wire cover.
(d) Connect the following hoses:
(1)
Water by–pass hose to the ISC valve
(2)
(USA Spec.)
Vacuum hose to throttle body
(3)
(Exc. USA Spec.)
Three vacuum hoses to throttle body
(e) Connect the following connectors:
(1)
Throttle position sensor connector
(2)
(w/ TRAC)
Sub–throttle position sensor connector
(3)
(w/ TRAC)
Sub–throttle actuator
27. REINSTALL
HEATER
WATER
VALVE
(a) Install the water valve and bracket assembly with the
two bolts.
(b) Install the engine wire clamp with the bolt.
(c) Connect the VSV connector.
EM–24
–
ENGINE MECHANICAL
Engine Tune–Up
28. REINSTALL RH NO.3 TIMING BELT COVER
(a) Install the three gaskets to the timing belt cover.
(b) Fit portion A of the timing belt cover, matching it with the
lower high–tension cord cover.
(c) Install the timing belt cover with the three bolts.
29. REINSTALL VSV FOR EVAP SYSTEM
Install the VSV with the two bolts.
30. REINSTALL LH NO.3 TIMING BELT COVER
(a) Install the three gaskets to the timing belt cover.
(b) Install the cord grommet to the high–tension cord.
(c) Install the cord grommet to the timing belt cover.
(d) Fit portion A of the timing belt cover, matching it with the
lower high–tension cord cover.
(e) Install the timing belt cover with the three bolts.
31. RECONNECT PCV HOSE TO LH CYLINDER HEAD
32. RECONNECT FUEL RETURN HOSE TO FUEL RETURN
PIPE
33. RECONNECT FUEL INLET HOSE TO LH DELIVERY PIPE
Connect the inlet hose with two new gaskets and the
pulsation damper.
SST 09612–24014 (09617–24011)
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.)
34. REINSTALL RH ENGINE WIRE COVER
(a) Fit portions A and B of the engine wire cover, matching
them with the lower high–tension cord cover and No.3
timing belt cover.
(b) Install the engine wire cover with the bolt.
–
ENGINE MECHANICAL
Engine Tune–Up
EM–25
35. REINSTALL LH ENGINE WIRE COVER
(a) Connect portions A and B engine wire cover to the wire
brackets.
(b) Set the VSV (for fuel pressure control system) wire in
original position.
(c) Fit portions C and D of the engine wire cover, matching
them with the lower high–tension cord cover and No.3
timing belt cover.
(d) Install the engine wire cover with the two bolts.
36. REINSTALL UPPER HIGH–TENSION CORD COVER
(a) Fit portion A of the upper high–tension cover, matching
the top of the lower high–tension cord cover.
(b) Push the front side of the upper high–tension cord
cover, and connect the front side claw groove of the
upper high–tension cord cover to the claw of the lower
high–tension cord cover.
(c) Install the upper high–tension cord cover with the two
bolts.
37. REINSTALL INTAKE AIR CONNECTOR
(a) Connect the end portions of the intake air connector to
the throttle body and air cleaner hose.
(b) Tighten the two hose clamps.
(c) Install the bolt holding the intake air connector to the
cylinder head cover.
(d) Connect the following hoses:
(1)
Air hose to ISC to ISC valve
(2)
Air hose (from PS air control valve) to intake air
connector
EM–26
–
ENGINE MECHANICAL
Engine Tune–Up
38. RECONNECT CONTROL CABLES TO THROTTLE BODY
Connect the following hoses:
(1)
Accelerator cable
(2)
A/T throttle control cable
(3)
(w/ Cruise Control System)
Cruise control actuator cable
39. REINSTALL THROTTLE BODY COVER
Install the throttle body cover and hose clamp with the two
bolts and cap nut.
40. RECONNECT CABLE TO NEGATIVE TERMINAL OF
BATTERY
41. FILL WITH ENGINE COOLANT (See page
INSPECTION OF IGNITION TIMING
(See page
Ignition timing:
8–12
°
BTDC @ idle
(w/ Terminals TE1 and E1 connected)
INSPECTION OF IDLE SPEED
HINT:
•
Initial conditions (See step 1 on page
)
•
Set the tachometer to the 4–cylinder range.
Idle speed: 700
±
50 rpm
–
ENGINE MECHANICAL
Engine Tune–Up
EM–27
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