1987 TOYOTA CELICA Service Repair Manual

i - -’ : ‘S -‘Adjii&i~ .#irn Selection Wing Chart
Shim thickness mm (in.)
!aranc
1 - 0, se ( cold I) :
-25 mm (0 .006 -0 .OlO in.) Shim
No. Thickness SiLrn ” Thickness
02 2.500 (0.0984) 20 2.95O’iO.1161)
04 2.550 (0.1004) 22 3.000 (0.118i)
06 2.600 (0.1024) 24 3.050 (0.1201)
08 2.650 (0.1043)
26 3.100 (0.1220)
10 2.700 (0.1063) 28 3.150 (0.1240)
12 2.750 (0.1083)
30 3.200 (0.1260)
1
Example: A 2.800 mm shim is Installed and the
measured clearance is 0.450 mm
Replace the 2.800 mm shim with
shim No. 24 (3.050 mm).

EM-16 ENGINE MECHANICA!. - Engine Tune-up
-.
Adjusting Shim Selection Using Chart
EXHAUST .-_
Lnstdod Shim Thlcknosr (mm) I
.-...
0~30~30)32/32~32132~4)34j34/34j
_. Shim thickness mm (in.)
Exhaust valve clearance (cold) :
0.20 - 0.30 mm (0.008 - 0.012 in.)
Example: A 2.800 mm shim is Installed and th
measured clearance is 0.450 mm
Replace the 2.800 mm shim with
shim No. 22 (3.000 mm).

ENGINE MECHANICAL. - Engine Tune-up
EM-?1 7.
INS’PECTIOlil ‘AhiD ADJUSTMENT O:F .-
IGNITION TIMING
1. VriARiiA. UP ENGINE.
Allow the engine to. reach normal operating temperature.
2.
CbNNECT TACHOMETER AND TIMING LIGHT TO
ENGINE
Connect the tachometer positive terminal to the check
connector terminal IG 0 .
CHECK CONNECTOR LOCATION: .,
s See pages FI-110, 111
CAUTION:
l Never allow the tachometer terminal to touch
ground as it could result in damage to the igniter
and/or ignition coil.
, 4% 3.
EC21 18
s As some tachometers are not compatible with this
ignition system, we recommend that you confirm
the compatibility of your unit before using.
NOTE (7M-GTE): Connect the timing light pickup to t
No.6 cylinder high-tension cord.
CHECK IGNITION TIMING
(a) Using a service wire, short terminals T(MA) or
TEI (MS) and El of the check connector.
CHEC,K CCNNECTOR LOCATION.:
See pages FI- 1’10, 111
(b) Check the idle. speed.
Idle speed: /-
7M-GE w/ TWC 700 rpm
w/o TWC 800 rpm
7M-GTE 800 rpm
(c) Using a timing light, check the ignition timing.
Ignition timing: IO” BTDC @ idle
[w/ short-circuited T (TEl) and El
and Transmission in “N” range]
c,
If necessary, loosen the distributor (7M-GE) or cam posz-’
tion sensor (7M-GTE) bolt and turn the distributor (cam
position sensor) to align the marks. Recheck the timing
- after tightening the distributor (cam position sensor).
Torque: 140 kg-cm (10 ft-lb, 14 N-m)
(cl) Unshort the check connector.

. .
EM-18 ENGINE MECHANICAL - Engine Tune-up
4. FURTHER CHECK IGNITION TIMING
Check that the ignition timing advances.
Ignition timing:
7M-GE ._ 10 -‘.13” BTDC @ idle
7M-GTE More than 12” BTDC @ idle
DISCONNECT TACHOMETER AND TIMING LIGHT
FROM ENGJNE

ENGINE MECHANICAL! Y) Engine Tune-up
Qy r\:y 9,.
, ,. . .,
1. 1. ., I ,,.,q,, ./. . . .
. . . . . . . J>
,; ..1’- -INSPECTION AND ADJUSTMENT OFIDLE
I
$‘,’ ,, :.. ,:
MIXTURE (w/o TWC)
2,
.: .,;.
4.
5. tNSPECT AND ADJUST IDLE CO CONCENTRATION
120 Seconds Tachometer
$0
H v
EC016
,
A. INITIAL CONDITIONS
(a) Ajr cleaner Jnstalled
(b) Normal engine operating temberature
(cf All pipes and hoses of air intake system connected
(d) All accessories switched off
‘6) All vacuum lines properly connected
(f) EFI system~‘w&g connectors fully plugged
c(g) I.gnitio$ 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.
~, r’.
’ _‘i..
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
‘-..*
(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
-.
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
’ ’
.-‘:I -
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.