1995 TOYOTA SUPRA Service Repair Manual

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Page 1321 of 2543

TOYOTA SUPRA 1995 Service Repair Manual IDLE AND OR 2500 RPM CO HC CHECK
HINT: This check is used only to determine whether or not the
idle CO/HC complies with regulations.
1. INITIAL CONDITIONS
(a) Engine at normal operating temperature
(

Page 1322 of 2543

TOYOTA SUPRA 1995 Service Repair Manual 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

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

Page 1323 of 2543

TOYOTA SUPRA 1995 Service Repair Manual 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 o

Page 1324 of 2543

TOYOTA SUPRA 1995 Service Repair Manual wIf adding oil helps the compression, it is likely that the
piston rings and/or cylinder bore are probably worn or
damaged.
wIf pressure stays low, a valve may be sticking or seating
improper, or ther

Page 1325 of 2543

TOYOTA SUPRA 1995 Service Repair Manual VALVE CLEARANCE INSPECTION AND
ADJUSTMENT (2JZ±GE)
HINT: Inspect and adjust the valve clearance when the en-
gine is cold.
1. REMOVE THROTTLE BODY AND INTAKE AIR
CONNECTOR ASSEMBLY
(See steps 1 to 9

Page 1326 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Valve clearance (Cold):
Intake
.15±0.25 mm (0.006±0.010 in.)
Exhaust
.25±0.35 mm (0.010±0.014 in.)
(b) Turn the crankshaft pulley 1 revolution (360°), and align the
groove with timing mark ºOº

Page 1327 of 2543

TOYOTA SUPRA 1995 Service Repair Manual wInsert SST (B) gently from the inside as shown in the
illustration.
wUsing a small screwdriver and a magnetic finger,
remove the adjusting shim.
(b) Determine the replacement adjusting shim size acc

Page 1328 of 2543

TOYOTA SUPRA 1995 Service Repair Manual EG±14± ENGINEENGINE MECHANICAL

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