TOYOTA CELICA 1987 Service Repair Manual

ENGINE MECHANICAL! Y) Engine Tune-up
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,; ..1’- -INSPECTION AND ADJUSTMENT OFIDLE
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MIXTURE (w/o TWC)
2,
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4.
5. tNSPECT AND ADJUST IDLE CO CONCENTRATION
120 Seconds Tachometer
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EC016
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A. INITIAL CONDITIONS
(a) Ajr cleaner Jnstalled
(b) Normal engine operating temberature
(cf All pipes and hoses of air intake system connected
(d) All accessories switched off
‘6) All vacuum lines properly connected
(f) EFI system~‘w&g connectors fully plugged
c(g) I.gnitio$ timing set correctly
(h) Transmission. i.n,.N range
CONNECT TACHCBMETER TO ENGINE
(See page EM-171
CHECK IDLE SPEED
Idle speed: 800 rpm
CAUTION:
a Always use a CO meter,.,when adjusting the idle mix-
ture. It is not necessary to adjust with the idle mix-
ture adjusting screw in. most vehicles if they are in
good condition. If a CO meter is not available, DO
NOT ATTEMPT TO ADJUST WITH THE SCREW.
l If a CO meter is not available and it is absolutely
necessary to adjust with the idle mixture adjusting
screw, or if the air flow meter is replaced, use the
alternative method.
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METHOD WITH CO METER
(a) Check that the CO meter is properly calibrated.
(b) Race the engine for approx. 120 seconds at appr 1,
2,500 rpm before measuring the concentration. r
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(c) Wait 1 - 3 minutes after racing the engine to allow
the concentration to stabilize.
(df Insert a testing probe at least 40 cm (1.3 ft) into the
tailpipe, and measure the concentration with a short
time.
Idle CO concentration: 1.0 -t- 0.5 %

EM-20 ENGIN lVlECHAN!CAL - Engine Tune-up
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EM288
c
HC
Aigh
High
High co
Normal
Low
High ‘- ‘, If the CO concentration is not as specified, adjust the idle
mixture by.furning the idle mixture adjusting screw with
SST.
SST 09243-00020 >
0 If the CO concentration is within specification, this
adjustment is complete.
l if the CO concentration cannot be corrected by idle
mixture adjustment, see the table below for other possi-
t ble causes. w
Troubleshooting
SYMPTOMS
Rough idle
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Rough idle
(Fluctuating HC reading)
Rough idle
(Black smoke from exhaust CAUSES
1. Faulty ignition:
0 Incorrect timing
0 Fouled, shorted or improperly gapped plugs
6 Open or crossed high-tension cords
0 Cracked distributor cap
2. Incorrect valve clearance
3. Leaky EGR valve
4. Leaky intake and exhaust valves
5. Lea,kv cvlinder
1. Vacuum leak:
0 Vacuum hose
0 EGR valve
0 Intake manifold (Air intake chamber)
0 Throttle body
l Cylinder head gasket,
0 Brake booster line
2. Lean mixture causing misfire
1. Restricted air filter
2. Faulty ,EFI system:
0 Faulty pressure regulator
0 Clogged fuel return line
0 Faulty air flow meter
0 Defective water temp. sensor
0 Defective air temp. sensor
0 Faulty ECU
l Faulty injector
0 Faulty cold start injector
l Faulty throttle position sensor

ture adjusting screw.
6. ALTERNATIVE METHOD
NOTE:
l This method is to be used ONLY when it is absolutely
necessary to adjust the idle mixture screw or if the air
flow meter is replaced without the aid of a CO meter..
0 Thefnscribed number shows the depth of the idle mix-
ture screw positioned for presetting. ,, ,, ‘-
Example: Inscribed number depth c ”
83 - 8.3 mm (0.326
in.)
Depths over 10 mm with a decimal point are abbreviated, i.:
Example: Inscribed number depth
15 - 11.6 mm (0.463 in.)
(a) Remove the rubber plug from the air flow meter.
(b) Measure the depth of the idle mixtura, adjusting
screw with vernier calipers;
(cl Adjust the depth of idle mixture adjusting screw by
turning the screw with SST.
SST 09243-00020
(d) Reinstall the rubber plug into the hole of the idle mix-
ture adjusting screw.

EM-22 ENGINE MECHANICAL - Engine Tune-up
INSPECTION OF IDLE HC/CO
CONCENTRATION (w/ TWC)
NOTE: This check method is used only to determine
whether or not the idle HWCO complies with regulations.
1. INSTALL CONDITIONS
(a) Air cleaner installed
(b) Normal engine operating temperature
(c) All pipes and hoses of intake system connected
(d) All accessories switches off
(e) All vacuum lines properly connected
NOTE: All vacuum hoses for EGR system etc. should be
properly connected
(f) EFI system wiring connectors fully p!ugged
(g) Ignition timing set correctly ‘.
(h) Transmission in “N” range
6) Tachometer and HWCO meter at hand and calibrated
2. WARM UP ENGINE
Allow the engine to reach normal operating temperature.
3. CONNECT TACHOMETER TO ENGINE
(See page EM- 17)
w ‘I” FI16C
4. CHECK IDLE SPEED
Idle speed :
7M-GE 700 rpm
7M-GTE 800 rpm
5. CHECK OXYGEN SENSOR OPERATION
(a) Using a service wire, short terminals T and El’of the
check connector.
CHECK CONNECTOR LOCATION: See page FI-I 10
(b) Connect the positive (+I probe of a voltmeter to ter-
minal VF of the check connector, and negative (-1
probe to terminal E 1.
(c) Hold the engine speed at 2,500 rpm for approx. 2
minutes.
(d) Then, maintaining engine at 2,500 rpm, count how
many times needle of voltmeter fluctuates between 0
and 5 V.
Minimum needle fluctuation : ’
8 times for every 10 seconds
If the fluctuation is less than minimum, check the air
induction system for leakage, If necessary, see EFI
SYSTEM.

, ENGINE ,MECHANICAL ‘& EriZjinb T.ufi&up $&p&a
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7.
8. . RACE ENGINE AT 2,500 RPM APPROX. 2 MINUTES.,
IkRT TESTING PROBE OF HCKO METER INTO TAIL
PIPE AT a0 cm (1.3 ftt)
MEAS,URE HC/CO CONCENTRATION AT IDLE
Wait $t lest one minute before measuring to allow the
concentration to stabilize.
Complete the measuring within -three minutes.
Idle CO concentration:
0 - 0.5 %
If the CO/HC concentration do& not conform to your
regulations, see the table in page EM-20 for possi,ble
cause+. I

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EM-24 ENGINE MECHANICAL - Engine Tune-up
INSPECTION’ AND ADJlJSTtiENT OF DASH
-- POT .(DP) SYSTEM
1. WARM UP ENGINE
2. CONNECT TACHOMETER TO ENGINE
(See page EM-171
3. CHECK IDLE SPEED
M-GE
IIP DiTphragm
I
Ed
!M-GTE
C
7

2)
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.
1
.
1
7lVi-GE
-
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IM-GTE
/ rottle Valve
leased
alve ’
4. INSPECT AND ADJUST DP SETTING.SPEED
(a) Maintain the engine speed at 3,000 rpm.
(b) Pinch the vacuum hose between the DP and VTV.
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(c) Release the throttle valve.
(d) Check that the DP is set.
DP setting speed : 2,000 rpm

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ENGINE MECHANICAL.- Engine Tun&up
7M-GE
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7M-GTE
7M-GE
Release
FM-GTE
Approx. if not at specified speed, adjust with the. DP adjUitiri&
Screw. , 1
5,~ CHECK OPERATION OF VTV
(a) f:;;ye DP speed in the same ptocedure as above; (a)
(b) Release the pinched hose and check that the engine
returns to idle speed in approx. 1 second.

EM-26 ENGINE MECHANICAL - Compression Check
d
COMPRESSION CHECK
NOTE: If there is lack of power, excessive oil consump-
tion or poor fuel mileage, measure the cylinder compres-
sion pressure.
(7M-GE)
1.
2.
3.
4.
5.
6. REMOVE SPARK PLUGS (See page IO-71
7.
EM3003
WARM UP ENGINE
DISCONNECT COLD START INJECTOR CONNECTOR
DISCONNECT SOLEtiOlD RESISTOR CONNECTOR
DISCONNECT DISTRIBUTOR CONNECTOR
REMOVE THROTTLE BODY
(a) Remove the PCV hose.
(b) Disconnect the water by-pass hoses and plug the
hose end.
(c) Disconnect following hoses:
. fwl EGR)
VSV hoses
. (wl TWC)
BVSV hoses
. (w/ EGR)
EGR vacuum modulator hoses
l No.7 air hose
id) Disconnect the throttle position sensor connector.
(e) Remove the throttle body bracket(s).
(f) Remove the four bolts, throttle body and gasket.
CHECK CYLINDER COMPRESSION PRESSURE
(a) Insert a compression gauge into the spark plug hole.
(b) While cranking the engine with the starter motor,
measure the compression pressure.
NOTE: Always use a
fully charged battery to obtain an
engine revolution of more than 250 rpm.
(c) Repeat steps Ia) through Ib) for each cylinder.
Compression pressure:
11.0 kg/cm2 (156 psi, 1,079 kPa) or more
Minimum pressure:
9.0 kg/cm2 (128 psi, 883 kPa)
Difference between each cylinder:
1 .O kg/cm2 (14 psi, 98 kPa) or less
(d) If cylinder compression in one or more cylinders is
low, pour a smali amount of engine oil into the
cylinder through the spark plug hole and repeat steps
(a) through (b) for the cylinder with low compression.
0 If adding oil helps the compression, chances are
that the piston rings and/or cylinder bore are worn
or damaged.
0 If pressure stays low, a valve may be sticking or
seating improperly, or there may be leakage past
the gasket.

ENGINE MECHANICAL 1 Compression Ctwck
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EMy27.
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(7M-GTE)
1. WARM UP ENGINE
2. DISCONNECT SOLENOID RESISTOR CONNECTOR
3. DISCONNECT CAM POSITION SENSOR CONNECTOR
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F5129,
4. REMOVE NO.1 AIR CLEANER HOSE
5. REMOVE PCV PIPE
‘1 6. REMOVE IGNITION COIL
(See steps 4, 5 on page EM-121
7. REMOVE SPARK PLUGS (See page IO-121 .
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8. CHECK CYLlNDER COMPRESSION PRESSURE
(See step 7 on page EM-261
Compression pressure:
10.0 kg/cm2 (142 psi, 981 kPa) or more
Minimum pressure:
.
9.0 kg/cm2 (128 psi, 883.kPa)
Difference between each cylinder:
1 .O kg/cm2 (14 psi, 98 kPa1 or less

EM-28
ENGINE MECliANICAL - Titiingj Belt.
TIMING B’ELT
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COMPONENTS
No. 3 Timing Belt Cover Camshaft Timing Pulley
I I ImIng oen
I
Crankshaft Pulley
kg-cm (ft-lb, N-ml : Specified torque
EM30f 31
REMOVAL OF TIMING BELT
1.
REMOVE SPARK PLUGS
2. REMOVE WATER OUTLET
Remove the two bolts, water outlet and thermostat with
. gasket.
3. .(with A/C)
REMOVE A/C BELT
4. REMOVE FAN AND ALTERNATOR DRIVE BELT
5.
REMOVE PS BELT