1986 TOYOTA SUPRA fuel pressure

7. REMOVE AIR INTAKE CHAMBER (WITH INTAKE AIR
CONTROL VALVE)
(a) Remove the 2 nuts holding the throttle body bracket to the
cylinder head.
Torque: 21 NVm (210 kgfVcm, 15 ftVlbf)
(b) Re mo ve th e 4 bo lts an d 2 nu ts ho ld in g th e in ta ke air
connector to the air intake chamber.
Torque: 27 NVm (270 kgfVcm, 20 ftVlbf)
(c) Remove the bolt, and disconnect the engine wire protector
from the air intake chamber.
(d) Disconnect these hoses:
(1) 3 vacuum hoses (from No.2 vacuum pipe) from No.1
vacuum pipe
(2) Vacuum hose (from No.2 vacuum pipe) from air intake
chamber
(3) PS air hose from air intake chamber
(4) Brake booster vacuum hose from air intake chamber
Remove the union bolt and 2 gaskets, and disconnect
the vacuum hose.
Torque: 29 NVm (300 kgfVcm, 22 ftVlbf)
(5) Vacuum hose (from actuator for ACIS) from No.1 vacu-
um pipe
(6) Except California:
Vacuum sensing hose (from fuel pressure regulator)
from air intake chamber
(e) Loosen the 2 nuts holding the air intake chamber stays to the
cylinder head.
Torque: 18 NVm (185 kgfVcm, 13 ftVlbf)
(f) Remove the 2 bolts, and disconnect the 2 air intake chamber
stays from the air intake chamber.
Torque: 18 NVm (185 kgfVcm, 13 ftVlbf)
± ENGINESFI SYSTEM (2JZ±GE)EG±233

C. Inspect VSV operation
(a) Check that air flows from port E to the filter.
(b) Apply battery voltage across the terminals.
(c) Check that air flows from port E to F.
If operation is not as specified, replace the VSV.
3. REINSTALL VSV
VSV FOR FUEL PRESSURE CONTROL
(California only)
COMPONENTS FOR REMOVAL AND
INSTALLATION
± ENGINESFI SYSTEM (2JZ±GE)EG±237

SERVICE SPECIFICATIONS
SERVICE DATA
 
 
Fuel pressure
regulator 
 
Fuel pressure at no vacuum 
 
265±304 kPa (2.7±3.1 kgf/cm2, 38±44 psi)
 Fuel pump Resistance at 20°C (68°F) 0.2±3.0

 
 
 
Injector 
 
 
Resistance
Injection volume
Difference between each cylinder
Fuel leakage 
 
 
13.4±14.2

70±88 cm3 (4.3±5.4 cu in.) per 15 sec.
9 cm
3 (0.5 cu in.) or less
One drop or less per minute
 
 
 
 
 
VAF meter
 
 
 
 
 
Resistance (THA±E2) at±20°C (±4°F)
at 0°C (32°F)
at 20°C (68°F)
at 40°C (104°F)
at 60°C (140°F)
 
 
 
 
 
10±20 k

4±7 k

2±3 k

0.9±1.3 k

0.4±0.7 k

 
 
 
 
Throttle body 
 
 
 
Throttle body fully closed angle
Dashpot setting speed M/T
A/T
Throttle opener setting speed 
 
 
 
65
2,600 + 400 rpm
1,800 + 400 rpm
1,500 + 400 rpm
 
 
 
 
 
Throttle
position
sensor 
 
 
 
 
Clearance between stop screw and lever
0 mm (0 in.) VTA±E2
0.40 mm (0.016 in.) IDL±E2
0.60 mm (0.024 in.) IDL±E2
Throttle valve fully open VTA±E2
± VC±E2 
 
 
 
 
0.34±6.3 k

0.5 k
or less
Infinity
2.4±11.2 k

3.1±7.2 k

 IAC valve Resistance B1 (or B2)±Others 18±22
 VSV for ACIS Resistance at 20°C (68°F) 38.5±44.5
 
 
 
 
 
VSV for Fuel
pressure
control
(California
only)
 
 
 
 
 
Resistance at 20°C (68°F)
 
 
 
 
 
33±39

 VSV for EVAP Resistance at 20°C (68°F) 27±33

 VSV for EGR Resistance at 20°C (68°F) 38.5±44.5
 
 
 
 
 
 
ECT sensor 
 
 
 
 
 
Resistance at ±20°C (±4°F)
at 0°C (32°F)
at 20°C (68°F)
at 40°C (104°F)
at 60°C (140°F)
at 80°C (176°F) 
 
 
 
 
 
10±20 k

4±7 k

2±3 k

0.9±1.3 k

0.4±0.7 k

0.2±0.4 k

 
 
EGR gas
temperature
sensor 
 
Resistance at 50°C (122°F)
at 100°C (212°F)
at 150°C (302°F) 
 
64±97 k

11±16 k

2±4 k

 
 
 
Main heated
oxygen sensor
(California)
 
 
 
Heater coil resistance at 20°C (68°F)
 
 
 
11±16

EG±256± ENGINESFI SYSTEM (2JZ±GE)

 
 
 
Sub heated
oxygen sensor
(California
only) 
 
 
Heater coil resistance at 20°C (68°F) 
 
 
11±16

 
 Fuel cut rpm
 
 Fuel return rpm
 
 1,400 rpm
TORQUE SPECIFICATIONS
 Part tightened NVm kgfVcm ftVlbf
 
 
Fuel line for union bolt
for flare nut 
 
29
30 
 
300
310 
 
22
22
 Fuel pressure regulator x Delivery pipe 8.8 90 78 in.Vlbf
 Delivery pipe x Intake manifold 21 210 15
 Actuator for ACIS x Air intake chamber 6.8 70 61 in.Vlbf
 Fuel inlet pipe x Delivery pipe 41 420 30 Fuel return pipe x Fuel pressure regulator 27 280 20 Air intake chamber stay x Cylinder head 18 185 13 
Air intake chamber stay x Air intake chamber
 
18
 
185
 
13 
Intake air connector x Air intake chamber
 
27
 
270
 
20 
 Throttle body bracket x Throttle body
 
 21
 
 210
 
 15
 Throttle body bracket x Cylinder head 21 210 15
 No.2 vacuum pipe x Intake manifold 27 270 20
 EGR pipe x Cylinder head 27 270 20
 EGR pipe x EGR valve 64 650 47
 
 
Fuel pressure pulsation damper x Fuel pipe support
for SST 
 
41
35 
 
420
350 
 
30
25
 Starter x Transmission 39 400 29
 Fuel tank band x Body 39 400 29 VAF meter x Air cleaner case 10 100 7 Throttle body x Intake air connector 21 210 15 
Vacuum tank x Intake manifold
 
21
 
210
 
15 
Brake booster union x Air intake chamber
 
29
 
300
 
22 
 Air intake chamber x Intake manifold
 
 27
 
 270
 
 20
 EGR gas temperature sensor x EGR valve 20 200 14
 Knock sensor x Cylinder block 44 450 33
 Oxygen sensor (Except California) x Exhaust manifold 20 200 14
 Main heated oxygen sensor (California) x Exhaust manifold 44 450 33
 Sub heated oxygen sensor (California only) x Center exhaust pipe 20 200 14
± ENGINESFI SYSTEM (2JZ±GE)EG±257

Troubleshooting
If the CO/HC concentration does not comply with regulations,
troubleshoot in the order given below.
(a) Check (main heated) oxygen sensors operation.
(See oxygen sensor(s) inspection in SFI System)
(b) See the table below for possible causes, and then inspect
and correct the applicable causes if necessary.
 CO HC Phenomenon Causes
 
 
 
 
 
 
 
 
Normal 
 
 
 
 
 
 
 
High 
 
 
 
 
 
 
 
Rough idle 
 
 
 
 
 
 
 
1. Faulty ignitions:

Incorrect timing

Fouled, shorted or improperly gapped plugs

Open or crossed high±tension cords (2JZ±GE)

Cracked distributor cap (2JZ±GE)
2. Incorrect valve clearance
3. Leaky EGR valve
4. Leaky intake and exhaust valves
5. Leaky cylinder
 
 
 
 
 
 
 
 
Low 
 
 
 
 
 
 
 
High 
 
 
 
 
 
 
 
Rough idle
(Fluctuating HC reading) 
 
 
 
 
 
 
 
1. Vacuum leaks:

PCV hose

EGR valve

Intake manifold

Air intake chamber

Throttle body

IAC valve

Brake booster line
2. Lean mixture causing misfire
 
 
 
 
 
 
 
 
 
 
High 
 
 
 
 
 
 
 
 
 
High 
 
 
 
 
 
 
 
 
 
Rough idle
(Black smoke from exhaust) 
 
 
 
 
 
 
 
 
 
1. Restricted air filter
2. Faulty SFI systems:

Faulty fuel pressure regulator

Clogged fuel return line

Defective ECT switch

Defective turbo pressure sensor (2JZ±GTE)

Faulty ECM

Faulty injector

Faulty throttle position sensor

Faulty VAF meter (2JZ±GE)

Faulty MAF meter (2JZ±GTE)
EG±8± ENGINEENGINE MECHANICAL

COMPRESSION CHECK
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 tempera-
ture.
2. 2JZ±GE:
DISCONNECT DISTRIBUTOR CONNECTOR
3. 2JZ±GTE:
DISCONNECT CAMSHAFT POSITION SENSOR CON-
NECTORS
4. 2JZ±GE:
DISCONNECT HIGH±TENSION CORDS FROM SPARK
PLUGS
(See high±tension cords and cord clamps removal in
Ignition System)
5. 2JZ±GTE:
REMOVE IGNITION COILS ASSEMBLIES
(See ignition coils removal in Ignition System)
6. REMOVE SPARK PLUGS
7. CHECK CYLINDER COMPRESSION
(a) Insert a compression tester into the spark plug hole.
(b) Wh ile cra n kin g th e en g in e , me a su re th e co mp re ssio n
pressure.
HINT: Always use a fully charged battery to obtain engine rev-
olutions 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
possible.
Standard pressure:
2JZ±GE
1,275 kPa (13.0 kgf/cm
2, 185 psi) or more
2JZ±GTE
1,079 kPa (11.0 kgf/cm
2, 156 psi) or more
Minimum pressure:
2JZ±GE
1,079 kPa (11.0 kgf/cm
2, 156 psi)
2JZ±GTE
883 kPa (9.0 kgf/cm
2, 128 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.
± ENGINEENGINE MECHANICALEG±9

23. REMOVE OIL DIPSTICK GUIDES FOR ENGINE AND
TRANSMISSION
(a) Remove the 2 bolts.
(b) Pull out the dipstick guide together with the dipstick.
(c) Remove the O±ring from the dipstick guide.
24. REMOVE STARTER
(See starter removal in Starting System)
25. REMOVE AIR INTAKE CHAMBER
(a) Except California:
Disconnect the vacuum sensing hose from the fuel pressure
regulator.
(b) Remove the bolt holding the engine wire protector to the the
air intake chamber.
(c) Remove the 5 bolts, nut, air intake chamber and gasket.
26. REMOVE VACUUM CONTROL VALVE SET
(a) Disconnect the VSV connector.
(b) Remove the 2 nuts and vacuum control valve set.
27. DISCONNECT ENGINE WIRE
(a) Remove the bolt, and disconnect the engine wire bracket
from the water pump.
(b) Remove the 2 bolts, and disconnect the 2 ground straps from
the intake manifold.
(c) Remove the 2 bolts, and disconnect the 2 wire clamps from
the intake manifold.
(d) Disconnect these connectors:
w6 injector connectors
wECT sensor connector
wECT sender gauge connector
± ENGINEENGINE MECHANICALEG±43

(e) Remove the 3 nuts, and disconnect the engine wire protector
from the intake manifold.
28. REMOVE WATER OUTLET AND NO.1 BYPASS HOSE
ASSEMBLY
Remove the 2 nuts, bolt and water outlet.
29. REMOVE INTAKE MANIFOLD STAY
Remove the 2 bolts and manifold stay.
30. REMOVE FUEL PRESSURE PULSATION DAMPER
(See step 2 in fuel pressure pulsation damper in SFI Sys-
tem)
31. REMOVE FUEL INLET PIPE
(a) Remove the clamp bolt from the intake manifold.
(b) Remove the union bolt and 2 gaskets, and disconnect the
fuel inlet pipe.
32. RE MO V E INTAKE MANIFO LD AND DE LIV E RY PIP E
ASSEMBLY
Remove the 6 bolts, 2 nuts, the intake manifold, delivery pipe
assembly and gasket. EG±44
± ENGINEENGINE MECHANICAL