1997 TOYOTA SUPRA fuel consumption

EM0A8-02
P12302Compression Tester
- ENGINE MECHANICAL (2JZ-GTE)COMPRESSION
EM-3
1108 Author
: Date
:
1997 SUPRA (RM502U)
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. DISCONNECT CAMSHAFT POSITION SENSOR
CONNECTORS
3. REMOVE IGNITION COILS ASSEMBLIES
(See page IG-6)
4. REMOVE SPARK PLUGS
5. 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.
Standard pressure:
1,079 kPa (11.0 kgf/cm
2, 156 psi) or more
Minimum pressure:
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.

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.
6. REINSTALL SPARK PLUGS
7. REINSTALL IGNITION COILS ASSEMBLIES
(See page IG-7)
8. RECONNECT CAMSHAFT POSITION SENSOR
CONNECTORS

TC037-01
(Possible Cause)
(Check Procedure and Correction Method)
Check intake air system, and repair or replace parts
as necessary. (See page TC-5)
Check intake air system, and repair or replace parts
as necessary. (See page TC-5)
Check exhaust system, and repair or replace parts
as necessary. (See page TC-5)
Check exhaust system, and repair or replace parts
as necessary. (See page TC-5) Check turbocharging pressure. (See page TC-5)
Turbocharging pressure:
61 - 75 kPa
(0.62 - 0.76 kgf/cm2, 8.8 - 10.8 psi)
If the pressure is below specifications, begin
diagnosis from item 2.
Check rotation of turbine shaft. If it does not turn or
turns with a heavy drag, replace the turbocharger
assembly.
Check axial and radial play of turbine shaft.
(See page TC-18)
Maximum axial play : 0.110 mm (0.0045 in.)
Maximum radial play: 0.173 mm (0.0068 in.)
If the play is greater than maximum, replace the
turbocharger assembly.
3. LEAK IN INTAKE AIR SYSTEM
4. RESTRICTED EXHAUST SYSTEM
6. ERRATIC TURBOCHARGER 5. LEAK IN EXHAUST SYSTEM
OPERATION 1. TURBOCHARGING PRESSURE
TOO LOW
2. RESTRICTED INTAKE SYSTEM
- TURBOCHARGING (2JZ-GTE)TROUBLESHOOTING
TC-1
1201 Author
: Date
:
1997 SUPRA (RM502U)
TROUBLESHOOTING
PROBLEM SYMPTOMS TABLE
HINT:
Before troubleshooting the turbocharger, first check the engine itself. (Valve clearance, engine compression,
ignition timing etc.)
1. INSUFFICIENT ACCELERATION, LACK OF POWER OR EXCESSIVE FUEL CONSUMPTION

(Possible cause) (Check Procedure and Correction Method)
Check for deformed exhaust pipe, loose mounting
bolts or damaged gasket, and repair or replace as
necessary.
Refer to item 6 of INSUFFICIENT ACCELERATION,
LACK OF POWER OR EXCESSIVE FUEL
CONSUMPTION.
Check for loose, improperly installed or deformed
insulator mounting bolts, and repair or replace as
necessary.1. TURBOCHARGING HEAT
INSULATOR
2. EXHAUST PIPE LEAKING
VIBRATING
3. ERRATIC TURBOCHARGER
OPERATION
(Possible Cause)(Check Procedure and Correction Method)
Check for oil leakage in exhaust system

Remove the turbine elbow from the turbocharger
and check for excessive carbon deposits on the
turbine wheel. Excessive carbon deposits
indicate a faulty turbocharger.
Check for oil leakage in intake air system.

Check for axial and radial play of turbine shaft
and replace the turbocharger if necessary.
(See page TC-18)
Maximum axial play : 0.110 mm (0.0045 in.)
Maximum radial play : 0.173 mm (0.0068 in.)
Some oil mist in the blowby from the PCV is
Do not mistake it for an oil leak from the
turbocharger.
FAULTY TURBOCHARGER SEAL
NOTICE:
normal.

TC-2
- TURBOCHARGING (2JZ-GTE)TROUBLESHOOTING
1202 Author
: Date
:
1997 SUPRA (RM502U)
2. ABNORMAL NOISE
3. EXCESSIVE OIL CONSUMPTION OR WHITE EXHAUST