compression ratio MAZDA 626 1987 Workshop Manual

1A TROUBLESHOOTING GUIDE
SPECIFICATIONS
——Engine model
Item ^ FE 12 -valve FE 8-valve F8 F6 ——Engine model
Item ^ FE 12 -valve ECE Except ECE ECE General F6
Type Gasoline, 4 cycle
Cylinder arrangement and number In line, 4 cylinders
Combustion chamber Pentroof Multispherical
Valve system OHC, belt driven
Displacement cc (cu in) 1,998 (121.9) 1,789 (109.1) 1,587 (96.8)
Bore and stroke mm (in) 86.0 x 86.0 (3.39 x 3.39) 86.0 x 77.0 (3.39 x 3.03) 81.0 x 77.0 (3.19 x 3.03)
Compression ratio 9.5 : 1 8.6 : 1 9.0 : 1
Compression pressure kPa (kg/cm2, psi)—rpm
Standard 1,422 (14.5,
206)—280 1,275 (13.0, 185)—270 1,128 (11.5, 164)—270 Compression pressure kPa (kg/cm2, psi)—rpm Minimum 996 (10.2,
144)—280 893 (9.1, 129)—270 790 (8.1, 114)—270
Valve timing
IN Open BTDC 14° 16° 20° 20° 17° 17°
Valve timing
IN Close ABDC 56° 54° 65° 65° 56° 56° Valve timing
EX Open BBDC 69° 54° 65° 65° 64° 64° Valve timing
EX Close ATDC 13° 16° 20° 20° 15° 15°
Valve clearance mm (in)
IN 0; Mainte-nance-free 0.30 (0.012)
Valve clearance mm (in)
EX 0; Mainte-nance-free 0.30 (0.012)
Idle speed rpm
MTX 800 _+5S ... carb., 850 ± 50 ... Fl
Idle speed rpm ATX 900 _+5g ... carb., 850 ± 50 ... Fl 950 _+5§ carb. 850 ±
50
.Fl
Ignition timing BTDC 6° ± 1°
Firing order
1
-3-4-2
76G01A-003
TROUBLESHOOTING GUIDE
Problem Possible Cause Remedy Page
Difficult starting Malfunction of engine-related components
Burned valve Worn piston, piston ring, or cylinder Failed cylinder head gasket
Replace Replace or repair Replace
1A-49
1A-57

1
A—20
Malfunction of fuel system Refer to Section 4
Malfunction of electrical system Refer to Section 5
Poor idling Malfunction of engine-related components Malfunction of HLA Improper valve clearance Poor valve to valve seat contact Failed cylinder head gasket
Replace Adjust Repair or replace Replace

1
A—75 1A-10 1 A—51
1
A—20
Malfunction of fuel system Refer to Section 4
Excessive oil
consumption
Oil working up Worn piston ring groove or sticking piston ring Worn piston or cylinder Replace Replace or repair

1
A—57 1A—57
Oil working down
Worn valve seal
Worn valve stem or guide Replace
Replace
1A—26
1A—49
Oil leakage Refer to Section 2A
76G01A-004
1A—4

TROUBLESHOOTING GUIDE 1 B
SPECIFICATIONS
Engine model FE DOHC
Item Leaded fuel Unleaded fuel
Type Gasoline, 4 cycle
Cylinder arrangement and number In line, 4 cylinders
Combustion chamber Pentroof
Valve system OHC, belt driven
Displacement cc (cu in) 1,998 (121.9)
Bore and stroke mm (in) 86.0 x 86.0 (3.39 x 3.39)
Compression ratio 10.0 : 1 9.2 : 1
Compression pressure Standard 1,422 (14.5, 206)—290 1,373 (14.0, 199)—310
kPa (kg/cm2, psi)-rpm Minimum 996 (10.2, 144)—290 961 (9.8, 139)—310
IN Open BTDC 10° 10°
Valve timing
IN Close ABDC 60° 55° Valve timing
EX Open BBDC 60° 55° EX Close ATDC 10° 10°
Valve clearance mm (in) IN 0; Maintenance-free Valve clearance mm (in) EX 0; Maintenance-free
Idle speed rpm 750 ± 50
Ignition timing BTDC 12° ± 1°
Firing order 1—3--4-2
76G01B-002
TROUBLESHOOTING GUIDE
Problem Possible Cause Remedy Page
Difficult starting Malfunction of engine-related components
Burned valve
Worn piston, piston ring, or cylinder
Failed cylinder head gasket
Replace
Replace or repair Replace
1B—35 1B—43 1B—16
Malfunction of fuel system Refer to Section 4C
Malfunction of electrical system Refer to Section 5
Poor Idling Malfunction of engine-related components Malfunction of HLA
Poor valve to valve seat contact
Failed cylinder head gasket
Replace
Repair or replace
Replace
1B—60 1B—37 1B—16
Malfunction of fuel system Refer to Section 4C
Excessive oil
consumption Oil working up Worn piston ring groove or sticking piston ring Worn piston or cylinder
Replace
Replace or repair
1B-43 1B-43
Oil working down
Worn valve seal
Worn valve stem or guide
Replace
Replace 1B-35
Oil leakage Refer to Section 2A
76G01B-003
1B—3

TROUBLESHOOTING GUIDE 1 C
SPECIFICATIONS
———Engine model
Item ^—_______ RF-CX RF-N
Type Diesel, 4 cycle
Cylinder arrangement and number In line, 4 cylinders
Combustion chamber Swirl chamber
Valve system OHC, belt driven
Displacement cc (cu in) 1,998 (121.9)
Bore and stroke mm (in) 86.0 x 86.0 (3.39 x 3.39)
Compression ratio 21.1 : 1 22.7 : 1
Compression pressure
kPa (kg/cm2, psi)-rpm
Standard 2.943 (30, 427)-200 Compression pressure
kPa (kg/cm2, psi)-rpm Minimum 2.649 (27, 384)-200
Valve timing
IN Open BTDC 13° 13°
Valve timing
IN Close ABDC 15° 39° Valve timing
EX Open BBDC 60° 60° Valve timing
EX Close ATDC 8° 8°
Valve clearance mm (in)
Cold IN 0.25 (0.010)
Valve clearance mm (in)
Cold EX 0.35 (0.014) Valve clearance mm (in) Warm (for ref.)
IN 0.30 (0.012) Valve clearance mm (in) Warm (for ref.) EX 0.40 (0.016)
Idle speed (MTX in neutral) rpm 720
Injection timing ATDC 10 TDC 0°
Injection order 1_3_4_2
76G01C-002
TROUBLESHOOTING GUIDE
Problem Possible Cause Remedy Page
Difficult starting Malfunction of engine-related components
Burned valve Worn piston, piston ring, or cylinder Failed cylinder head gasket
Replace Replace or repair Replace
1C-48 1C—55,56 1C-16
Difficult starting
Malfunction of fuel system Refer to Section 4D
Difficult starting
Malfunction of Comprex supercharger Refer to Section 4D
Difficult starting
Malfunction of electrical system Refer to Section 5
Poor idling Malfunction of engine-related components Improper valve clearance Poor valve to valve seat contact Failed cylinder head gasket
Adjust Repair or replace Replace
1C-85 1C-50 1C—16
Poor idling
Malfunction of fuel system Refer to Section 4D
Poor idling
Malfunction of Comprex supercharger Refer to Section 4D
Excessive oil consumption
Oil working up Worn piston ring groove or sticking piston ring Worn piston or cylinder
Replace Replace or repair
1C-57 1C—55,56
Excessive oil consumption
Oil working down Worn valve seal Worn valve stem or guide
Replace Replace
1C-24 1C-48
Excessive oil consumption
Oil leakage Refer to Section 2B
76G01C-003
1C—3

TROUBLESHOOTING GUIDE
4A

TROUBLESHOOTING GUIDE
F6 (GENERAL)
The Troubleshooting Guide lists the systems most likely to cause
a
given symptom. After finding the
system(s)
to
check, refer
to
the pages shown
for
detailed guides
for
each system.
\\ POSSIBLE CAUSE
\ PAGE


SYMPTOM
Air

cleaner
(Air
cleaner
element)
intake
air
temperature
control

system
Idle

adjustment
Fuel
system
(Carburetor,
Fuel
pump)

idle-up

control
system
Exhaust
system
Positive
crankcase
ventilation

system
Auto-return
choke
system

\\ POSSIBLE CAUSE
\ PAGE


SYMPTOM 4A—23 4A—60 4A—38 4A—24 4A—68 4A—96 4A—67 4A—40
1 Hard start
or
won't start (Cranks
OK)
1 2

2 Engine stalls During warm
up
3 2 1 4
2 Engine stalls After warm
up
4 2 5 1 3

3 Rough Idle During warm
up
3 2 1 4
3 Rough Idle After warm
up
3 2 5 1 4

4 High idle speed after warm
up
1 3 2

5 Poor acceleration, hesitation, or lack
of
power
1 2 3

6 Runs rough
on
deceleration
1

7 Afterburn
in
exhaust system
1

8 Poor fuel consumption
2 1 4 3

9 Fails emission test
2 1 4 5 3

76G04A-015
The numbers of the list show the priorities
of
inspections from the most possible to that with the lowest
possibility.
These were determined
on
the following basis:
• Ease
of
inspection
•
Most possible system
•
Most Possible point
in
system
TROUBLESHOOTING PROCEDURE:
1st Check the following items:
Electrical system
1) Battery condition
2) Fuses
Ignition system
1) Spark plugs
2) Ignition timing
Fuel system
1) Fuel level
2) Fuel leakage
3) Fuel filter
4) Idle speed
Intake
air
system
1) Vacuum
or air
leakage
2) Vacuum hose routing
3) Accelerator cable
4) Choke cable
2nd Check Fuel and Emission Control Systems
Engine
1) Compression
2) Overheating
Others
1) Clutch slippage
2) Brake dragging
4 A-17

4A TROUBLESHOOTING GUIDE
F6 (SINGAPORE)
The Troubleshooting Guide lists the systems most likely
to
cause
a
given symptom. After finding
the

system(s)
to
check, refer
to the
pages shown
for
detailed guides
for
each system.
POSSIBLE CAUSE
\ PAGE


SYMPTOM
Air

cleaner
(Air
cleaner
element)

Intake

air
temperature
control
system

Idle

adjustment
Fuel
system
(Carburetor,
Fuel
pump)

Air

injection
system
Deceleration
control
system
Positive
crankcase
ventilation
system

Exhaust

system

Idle-up

control
system

POSSIBLE CAUSE
\ PAGE


SYMPTOM 4A-23 4A-60 4 A—38 4A—24 4A-58 4A-45 4A-67 4A-SW 4A—68
1 Hard start
or
won't start (Cranks
OK)
1 2

2 Engine stalls During warm
up
3 2 1 4
2 Engine stalls After warm
up
3 2 4 1

3 Rough idle During warm
up
3 2 1 4
3 Rough idle After warm
up
3 2 4 1

4 High idle speed after warm
up
1 4 3* 2

5 Poor acceleration, hesitation,
or
lack
of
power
1 2 3

6 Runs rouah
on
deceleration
2 1

7 Afterburn
in
exhaust svstem
2 1

8 Poor fuel consumption
2 1 4 3

9 Fails emission test
6 4 5 3 2 1
Only MTX
76G04A-016
The numbers
of
the list show the priorities
of
inspections from the most possible to that with the lowest
possibility.
These were determined
on the
following basis:
• Ease
of
inspection
•
Most possible system
•
Most possible point
in
system
TROUBLESHOOTING PROCEDURE:
1st Check
the
following items:
Electrical system
1) Battery condition
2) Fuses
Ignition system
1) Spark plugs
2) Ignition timing
Fuel system
1) Fuel level
2) Fuel leakage
3) Fuel filter
4) Idle speed
Intake
air
system
1) Vacuum
or air
leakage
2) Vacuum hose routing
3) Accelerator cable
Engine
1) Compression
2) Overheating
Others
1) Clutch slippage
2) Brake dragging
2nd Check
the
Fuel
and
Emission Control Systems
4A—18

TROUBLESHOOTING GUIDE
4A

FE
12
VALVE and
F8
(EXCEPT MIDDLE EAST and GENERAL)
The Troubleshooting Guide lists the systems most likely to cause
a
given symptom. After finding
the

system(s)
to
check, refer
to
the pages shown
for
detailed guides
for
each system.
POSSIBLE CAUSE
\ PAGE
SYMPTOM


Air

cleaner
(Air

cleaner

element)

Intake

air

temperature

control
system

Idle

adjustment
Fuel
system
(Carburetor,
Fuel
pump)
PTC
heater
system

Air

injection
system
Positive
crankcase
ventilation
system
Deceleration
control
system

Idle-up

control
system

Ignition

control
system

POSSIBLE CAUSE
\ PAGE
SYMPTOM

4A-23 4A-60 4A-38 4A-24 4A-42 4A-58 4A-67 4A—45 4A—68 4 A—80
1 Hard start
or
won't start
(Cranks
OK)
1 2

2 Engine stalls During warm
up
5 4 1 6 2 3
2 Engine stalls After warm
up
3 2 4 1

3 Rough idle During warm
up
5 4 1 6 2 3
3 Rough idle After warm
up
3 2 4 1

4 High idle speed after warm
up
1 4 3 2

5 Poor acceleration, hesitation, or lack
of
power
1 4 2 3

6 Runs rough
on
deceleration
2 1

7 Afterburn
in
exhaust system
2 1

8 Poor fuel consumption
3 1 4 2
4
9 Fails emission test
6 2 5 3 1 4

76G04A-017
The numbers of the list show the priorities
of
inspections from the most possible to that with the lowest
possibility.
These were determined
on the
following basis:
• Ease
of
inspection
•
Most possible system
•
Most possible point
in
system
TROUBLESHOOTING PROCEDURE:
1st Check the following items:
Electrical system
1) Battery condition
2) Fuses
Ignition system
1) Spark plugs
2) Ignition timing
Fuel system
1) Fuel level
2) Fuel leakage
3) Fuel filter
4) Idle speed
Intake
air
system
1) Vacuum
or air
leakage
2) Vacuum hose routing
3) Accelerator cable
Engine
1) Compression
2) Overheating
Others
1) Clutch slippage
2) Brake dragging
2nd Check the Fuel
and
Emission Control Systems
4A—19

4A TROUBLESHOOTING GUIDE
FE and F8 (GENERAL)
The Troubleshooting Guide lists the systems most likely to cause a given symptom. After finding the
system(s) to check, refer to the pages shown for detailed guides for each system.
POSSIBLE CAUSE
\ PAGE
SYMPTOM

Air

cleaner

(Air

cleaner

element)

Intake

air

temperature

control

system

Idle

adjustment

Fuel

system

(Carburetor,

Fuel

pump)

Idle-up

control
system
PTC
heater
system
Positive
crankcase

ventilation

system

Deceleration

control
system
POSSIBLE CAUSE
\ PAGE
SYMPTOM 4A-23 4A—60 4A—38 4A—24 4A—68 4A—42 4A—67 4A—45
1 Hard start or won't start (Cranks OK) 1 2
2 Engine stalls During warm up 5 4 1 6 2 3 2 Engine stalls After warm up 3 2 4 1
3 Rough idle During warm up 5 4 1 6 2 3 3 Rough idle After warm up 3 2 4 1
4 High idle speed after warm up 1 4 2 3
5 Poor acceleration, hesitation, or lack of power 1 4 3 2
6 Runs rough on deceleration 2 1
7 Afterburn in exhaust system 2 1
8 Poor fuel consumption 2 1 3
9 Fails emission test 3 2 4 1
76G04A-018
The numbers of the list show the priorities of inspections from the most possible to that with the lowest
possibility.
These were determined on the following basis:
Ease of inspection Most possible system Most possible point in system
TROUBLESHOOTING PROCEDURE:
1st Check the following items:
Electrical system
1) Battery condition
2) Fuses
Ignition system
1) Spark plugs
2) Ignition timing
Fuel system
1) Fuel level
2) Fuel leakage
3) Fuel filter
4) Idle speed
Intake air system
1) Vacuum or air leakage
2) Vacuum hose routing
3) Accelerator cable
Engine
1) Compression
2) Overheating
Others
1) Clutch slippage
2) Brake dragging
2nd Check the Fuel and Emission Control Systems
4A—20

TROUBLESHOOTING GUIDE 4A
FE (MIDDLE EAST)
The Troubleshooting Guide lists the systems most likely to cause a given symptom. After finding the
system(s) to check, refer to pages shown for detailed guides for each system.
V. POSSIBLE CAUSE
\ PAGE
SYMPTOM

I
Air

cleaner

(Air

cleaner

element)

Intake

air

temperature

control

system

Idle

adjustment

Fuel

system

(Carburetor,

Fuel

pump)

Idle-up

control

system
Dashpot

(Only

MTX)

Positive

crankcase

ventilation

system
Exhaust
system

Evaporative

emission

control

system

Auto-return

choke

system

V. POSSIBLE CAUSE
\ PAGE
SYMPTOM 4A—23 4A-60 4 A—38 4A-24 4A-68 4A-50 4A-67 4A-96 4A-78 4A-40
1 Hard start or won't start
(Cranks OK) 1 2 3
2 Engine stalls During warm up 3 2 1 4 2 Engine stalls After warm up 3 2 4 1
3 Rough idle During warm up 3 2 1 4 3 Rough idle After warm up 3 2 4 1
4 High idle speed after warm up 1 5 3 4 2
5 Poor acceleration, hesitation, or lack of power 1 2 3
6 Runs rough on deceleration 2 1
7 Afterburn in exhaust system 3 1 2
8 Poor fuel consumption 5 1 6 2 3 4
9 Falls emission test 5 4 6 3 1 2
76G04A-019
The numbers of the list show the priorities of inspections from the most possible to that with the lowest
possibility.
These were determined on the following basis:
• Ease of inspection • Most possible system • Most possible point in system
TROUBLESHOOTING PROCEDURE:
1st Check the following items:
Electrical system
1) Battery condition
2) Fuses
Ignition system
1) Spark plugs
2) Ignition timing
Fuel system
1) Fuel level
2) Fuel leakage
3) Fuel filter
4) Idle speed
Intake air system
1) Vacuum or air leakage
2) Vacuum hose routing
3) Accelerator cable
4) Choke cable
Engine
1) Compression
2) Overheating
Others
1) Clutch slippage
2) Brake dragging
2nd Check the Fuel and Emission Control Systems
4 A—21

4A TROUBLESHOOTING GUIDE
FE 8VALVE—UNLEADED FUEL
The Troubleshooting Guide lists the systems most likely to cause a given symptom. After finding the
system(s) to check, refer to the pages shown for detailed guides for each system.
V POSSIBLE CAUSE
\ PAGE
SYMPTOM
Air

cleaner

(Air

cleaner

element)

Idle

adjustment

Fuel

system
(Carburetor,

Fuel

pump)
PTC

heater

system

Air

injection
system

Positive

crankcase

ventilation

system

Deceleration

control
system
Exhaust
gas

recirculation

(EGR)
system

Exhaust

system
Intake
air

temperature

control
system

Idle-up

control

system
Purge

control

system
Auto-return
choke
system
V POSSIBLE CAUSE
\ PAGE
SYMPTOM 4A-23 4A-38 4A-24 4A—42 4A-58 4A—67 4A—45 4A-96 4A-97 4A—60 4A—68 4A--63 4A—40
1 Hard start or won't start
(Cranks OK) 1 2
2 Engine stalls During warm up 6 1 2 5 3 4 2 Engine stalls After warm up 4 2 3 1
3 Rough Idle During warm up 5 1 2 4 3 6 3 Rough Idle After warm up 4 2 3 1
4 High idle speed after warm up 1 5 4 3 2
5 Poor acceleration, hesitation, or lack of power 1 2 5 3 4
6 Runs rough on deceleratio 2 1
7 Afterburn in exhaust system 2 1
8 Poor fuel consumption 4 1 2 3 5
9 Fails emission test 5 1 6 4 3 2
76G04A-020
The numbers of the list show the priorities of inspections from the most possible to that with the lowest
possibility.
These were determined on the following basis:
• Ease of inspection • Most possible system • Most possible point in system
TROUBLESHOOTING PROCEDURE:
1st Check the following items:
Electrical system
1) Battery condition
2) Fuses
Intake air system
1) Vacuum or air leakage
2) Vacuum hose routing
3) Accelerator cable
4) Choke cable
2nd Check the Fuel and Emission Control Systems
Ignition system
1) Spark plugs
2) Ignition timing
Engine
1) Compression
2) Overheating
Fuel system
1) Fuel level
2) Fuel leakage
3) Fuel filter
4) Idle speed
Others
1) Clutch slippage
2) Brake dragging
4A-22

TROUBLESHOOTING GUIDE 4B
TROUBLESHOOTING GUIDE
This troubleshooting guide shows the malfunction numbers and the symptoms of various failures.
Perform troubleshooting as described below.
Possible cause
Symptom
Input sensors and switches
o> Q.
C
0
Jh c 01
4B-14
a> 4)
E
o
4B-1S
o in c « m o E k_ 0) c.
0 <0 £
4B-16
o CO c a> 0) o E
a>
.x
co
4B-17
o 10 c a) co
4B-18
o in c a> (0
o> o> a>
a) £ a VI o E
4B-19
0 <0 c a> 0) c a> 01
S? o
4B-20
E a> in (0
o 10 A •o 0) 0> u.
4B-21
Output solenoid valves
o «
3 O) 0)
0) 0) 01
0> > 10 >
•o o c V o tt)
4B-22
0)
OI

0> > CO >

TJ
O c 0> o CO
4B-23
oc O u
o> > 75 >
•o o c a> o 05
4B-23
0 a. 3 1
2
0) > (0 >
"D O
o 0> in in a a >. £
4B-23
ffl a 3 • a>
2
a> > 10 >
"O o c a> o
CO Q. >. JO
4B-24
Fault Indicated by SST
Code No. 01 08 09 10 12 14 15 17 25 26 28 34 35
Hard start or won't start
(Cranks OK)
Engine stalls
Rough
idle
While warming up
After warming up
While warming up
After warming up
High idle speed after
warming up
TROUBLESHOOTING PROCEDURE
Note
Step 1 under symptom is to quickly determine what system or unit may be at fault by use of the SST. (Self-Diagnosis Checker 49 H018 9A1)
1st:
Check input sensors and output solenoid valves with the
SST.
(Refer
to
page 4B—10.)

2nd:
Check other switches with the
SST.
(Refer
to
page 4B—26.)

3rd:
Check the following items:

11
Poor acceleration, hesita-
tion or lack of power
Runs rough on deceleration
Afterburn in exhaust system
Poor fuel consumption
Engine stalls or rough after hot starting
Electrical system
1) Battery condition
2) Fuses

Fuel system
1) Fuel level 2) Fuel leakage
3) Fuel filter 4) Idle speed

Engine
1) Compression 2) Overheating

Ignition system

1) Ignition spark 2) Ignition timing

Intake air system
1)
Air
cleaner element 2) Vacuum
or air
leakage 3) Vacuum hose routing
4) Accelerator cable

Others
1) Clutch slippage 2) Brake dragging

Fails emission test 4th:
Check Fuel and Emission Control Systems. (Refer
to
page 4B—8.)

76G04B-003
4B—7