spark plugs LEXUS GS400 2000 Service Repair Manual

EM0D1±05
A11132
Compression Tester
± ENGINE MECHANICAL (2JZ±GE)COMPRESSION
EM±3
1357 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
COMPRESSION
INSPECTION
HINT:
If there is lack of power, excessive oil consumption or poor fuel
economy, measure the compression pressure.
1. WARM UP AND STOP ENGINE
Allow the engine to warm up to normal operating temperature.
2. REMOVE ENGINE COVER
Remove the 4 nuts and engine cover.
3. DISCONNECT IGNITION COILS AND HIGH±TENSION
CORD SET ASSEMBLY (See page IG±7)
4. REMOVE SPARK PLUGS
5. DISCONNECT INJECTOR CONNECTORS
6. CHECK CYLINDER COMPRESSION
(a) Insert a compression tester into the spark plug hole.
(b) While cranking the engine, measure the compression
pressure.
HINT:
Always use a fully charged battery to obtain engine revolutions
of 250 rpm or more.
(c) Repeat steps (a) through (b) for each cylinder.
NOTICE:
This measurement must be done in as short a time as pos-
sible.
Compression:
1,324 kPa (13.5 kgf/cm
2, 192 psi) or more
Minimum pressure:
1,079 kPa (11.0 kgf/cm
2, 156 psi)
Difference between each cylinder:
98 kPa (1.0 kgf/cm
2, 14 psi) or less
(d) If the cylinder compression in 1 or more cylinders is low,
pour a small amount of engine oil into the cylinder through
the spark plug hole and repeat steps (a) through (b) for
the cylinder with low compression.

If adding oil helps the compression, it is likely that
the piston rings and/or cylinder bore are probably
worn or damaged.

If pressure stays low, a valve may be sticking or
seating improper, or there may be leakage past the
gasket.

EM±4
± ENGINE MECHANICAL (2JZ±GE)COMPRESSION
1358 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
7. RECONNECT INJECTOR CONNECTORS
HINT:
The Nos.1, 3, 5 injector connectors and dark gray, and the
Nos.2, 4, 6 injector connectors are brown.
8. REINSTALL SPARK PLUGS
9. RECONNECT IGNITION COILS AND HIGH±TENSION
CORD SET ASSEMBLY (See page IG±9)
10. INSTALL ENGINE COVER
Install the engine cover with the 4 nuts.

A02819
A09752
A02735
EM±34
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
1388 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(b) Remove the 3 bolts and nuts holding the front exhaust
pipe to the exhaust manifold.
(c) Remove the 2 bolts and pipe support bracket.
(d) Disconnect the front exhaust pipe from the exhaust man-
ifold, and remove the 2 gaskets.
10. REMOVE EXHAUST MANIFOLD
(a) Disconnect the 3 heated oxygen sensor connectors and
clamp.
(b) Remove the clamp and case clamp.
(c) Using a 14 mm deep socket wrench, remove the 8 nuts,
exhaust manifold and 2 gaskets.
11. REMOVE WATER BYPASS OUTLET AND NO.1
WATER BYPASS PIPE (See page CO±11)
12. REMOVE THROTTLE BODY AND INTAKE AIR
CONNECTOR ASSEMBLY (See page EM±5)
13. REMOVE OIL DIPSTICK AND GUIDE FOR ENGINE
(See page LU±6)
14. REMOVE OIL DIPSTICK AND GUIDE FOR A/T
(See page EM±62)
15. REMOVE AIR INTAKE CHAMBER (See page SF±46)
16. REMOVE VACUUM CONTROL VALVE SET AND NO.2
VACUUM PIPE
(a) Disconnect the VSV connector for the ACIS.
(b) Remove the 3 nuts, vacuum control valve set and No.2
vacuum pipe.
(c) Disconnect the engine wire clamp from the clamp bracket
of the No.2 vacuum pipe.
17. REMOVE NO.3 TIMING BELT COVER
18. REMOVE IGNITION COILS AND HIGH±TENSION
CORD SET ASSEMBLY (See page IG±7)
19. REMOVE SPARK PLUGS

A02638
A02651
A02664
EX
IN135
24
135
24 1 1
EM±6
± ENGINE MECHANICAL (2JZ±GE)VALVE CLEARANCE
1360 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
5. REMOVE NO.3 TIMING BELT COVER
Using a 5 mm hexagon wrench, remove the 4 bolts, oil filler cap,
timing belt cover and gasket.
6. REMOVE IGNITION COILS AND HIGH±TENSION
CORD SET ASSEMBLY (See page IG±7)
7. REMOVE SPARK PLUGS
8. DISCONNECT ENGINE WIRE FROM CYLINDER HEAD
COVERS
9. REMOVE CYLINDER HEAD COVERS
(See page EM±33)
10. SET NO.1 CYLINDER TO TDC/COMPRESSION
(a) Turn the crankshaft pulley and align its groove with the
timing mark º0º of the No.1 timing belt cover.
NOTICE:
Always turn the crankshaft clockwise.
(b) Check that the timing marks of the camshaft timing pul-
leys are aligned with the timing marks of the No.4 timing
belt cover.
If not, turn the crankshaft 1 revolution (360°).
11. INSPECT VALVE CLEARANCE
(a) Check only those valves indicated in the illustration.

Using a feeler gauge, measure the clearance be-
tween the valve lifter and camshaft.

Record the valve clearance measurements of those
that are out of specification. They will be used later
to determine the required replacement adjusting
shim.
Valve clearance (Cold):
Intake0.15 ± 0.25 mm(0.006 ± 0.010 in.)
Exhaust0.25 ± 0.35 mm (0.010 ± 0.014 in.)
(b) Turn the crankshaft pulley 1 revolution (360°), and align
the groove with the timing mark º0º of the No.1 timing belt
cover.

± ENGINE MECHANICAL (2JZ±GE)VALVE CLEARANCE
EM±9
1363 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
15. REINSTALL SPARK PLUGS
16. REINSTALL IGNITION COILS AND HIGH±TENSION
CORD SET ASSEMBLY (See page IG±9)
17. REINSTALL NO.3 TIMING BELT COVER
(a) Install the gasket to the timing belt cover.
(b) Using a 5 mm hexagon wrench, install the timing belt cov-
er with the 4 bolts.
Torque: 8.0 N´m (80 kgf´cm, 71 in.´lbf)
(c) Install the oil filler cap.
18. REINSTALL THROTTLE BODY AND INTAKE AIR CON-
NECTOR ASSEMBLY
(a) Install a new gasket to the air intake chamber.
(b) Place the throttle body together with the intake air con-
nector on the cylinder head.
(c) Connect the vacuum hose (from actuator for ACIS) to the
No.1 vacuum pipe.
(d) Connect the 2 water bypass hoses to the throttle body.
(e) Install the 4 bolts and 2 nuts holding the intake air connec-
tor to the air intake chamber.
Torque: 28 N´m (280 kgf´cm, 21 ft´lbf)
(f) Install the 2 nuts holding the throttle body bracket to the
cylinder head.
Torque: 21 N´m (210 kgf´cm, 15 ft´lbf)
(g) Connect the air assist hose to the intake air connector.
(h) Install the PCV hose to the intake air connector.
(i) Install the EVAP hose (from charcoal canister) to the VSV
for EVAP.
(j) Install the vacuum hose (from No.2 vacuum pipe) to the
No.1 vacuum pipe.
(k) Install the throttle position sensor connector.
(l) Install the accelerator pedal position sensor connector.
(m) Install the throttle control motor connector.
(n) Install the VSV connector for EVAP.
(o) Secure the engine wire with the clamp on the throttle body
bracket.
(p) Install the engine wire clamp with the clamp bracket of the
throttle body.
(q) Connect the accelerator cable to the throttle body.
19. REINSTALL INTAKE AIR RESONATOR
20. REINSTALL ENGINE COVER
Install the engine cover with the 4 nuts.
21. REFILL WITH ENGINE COOLANT
22. START ENGINE AND CHECK FOR LEAKS

A02733
Clamp Bracket
A02811
A02732
(v)(s)(t)
(u)(u)
(t)
(s) EM±56
± ENGINE MECHANICAL (2JZ±GE)CYLINDER HEAD
1410 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
(g) Connect the 2 knock sensor connector.
(h) Connect the starter connector.
(i) Connect the oil pressure switch connector.
(j) Connect the oil level sensor connector.
(k) Install the clamp bracket to the intake manifold.
(l) Connect the 2 wire clamps to the No.1 oil pipe and clamp
bracket on the intake manifold.
(m) Install the 2 ground terminals to the intake manifold.
Tighten so that each calking part should face inside.
(n) Install the clamp bracket to the water pump.
(o) Connect the generator connector.
(p) Connect the crankshaft position sensor connector.
(q) Connect the heated oxygen sensor (bank 1 sensor 1)
connector.
(r) Secure the engine wire with the clamp.
(s) Install the 2 hose clamps to the cylinder head and oil filter
bracket.
(t) Install the heated oxygen sensor (bank 2 sensor 1) con-
nector and engine wire clamp to the hose clamps.
(u) Install the 2 water bypass hoses to the hose clamps on
the cylinder head and oil filter bracket.
(v) Install the ground strap to the cylinder head.
12. INSTALL SPARK PLUGS
13. INSTALL IGNITION COILS AND HIGH±TENSION
CORD SET ASSEMBLY (See page IG±9)
14. INSTALL NO.3 TIMING BELT COVER
Torque: 8.0 N´m (80 kgf´cm, 71 in.´lbf)

MA004±04
B01384
± MAINTENANCEENGINE
MA±5
48 Author: Date:
2000 LEXUS GS300/GS400 (RM718U)
ENGINE
INSPECTION
HINT:
Inspect these items when the engine is cold.
1. REPLACE TIMING BELT
(2JZ±GE ENGINE: See page EM±16)
(1UZ±FE ENGINE: See page EM±14)
2. INSPECT DRIVE BELT
(2JZ±GE ENGINE: See page CH±1)
(1UZ±FE ENGINE: See page CH±1)
3. REPLACE SPARK PLUGS
(2JZ±GE ENGINE: See page IG±1)
(1UZ±FE ENGINE: See page IG±1)
4. INSPECT AIR FILTER
(a) Remove the air filter.
(b) Visually check that the air filter is not excessively dam-
aged or oily.
If necessary, replace the air filter.
(c) Clean the filter with compressed air.
First blow from the inside thoroughly, then blow the out-
side of the filter.
(d) Reinstall the air filter.
5. REPLACE AIR FILTER
Replace the air filter with a new one.
6. REPLACE ENGINE OIL AND OIL FILTER
(2JZ±GE ENGINE: See page LU±2)
(1UZ±FE ENGINE: See page LU±3)
7. REPLACE ENGINE COOLANT
(2JZ±GE ENGINE: See page CO±2)
(1UZ±FE ENGINE: See page CO±2)
8. REPLACE GASKET IN FUEL TANK CAP
(2JZ±GE ENGINE: See page EC±7)
(1UZ±FE ENGINE: See page EC±7)
9. INSPECT FUEL LINES AND CONNECTIONS
Visually check the fuel lines for cracks, leakage, loose connec-
tions, deformation or tank band looseness.
10. INSPECT EXHAUST PIPES AND MOUNTINGS
Visually check the pipes, hangers and connections for severe
corrosion, leaks or damage.
11. ADJUST VALVE CLEARANCE
(2JZ±GE ENGINE: See page EM±5)
(1UZ±FE ENGINE: See page EM±4)