fuel MAZDA 626 1987 Repair Manual
[x] Cancel search | Manufacturer: MAZDA, Model Year: 1987, Model line: 626, Model: MAZDA 626 1987Pages: 1865, PDF Size: 94.35 MB
Page 373 of 1865
4A OUTLINE
EMISSION COMPONENTS LOCATION
ECE, Hong Kong, and Singapore
Dashpot*
Reed valve
Solenoid valve*2 (Ignition timing control system)
Vacuum switch*5
Anti-afterburn valve
Choke opener
Idle-up solenoid valve^*5
or coasting leaner*6
Water thermo switch
Thermo valve*6
Water thermo switch
PTC heater*5
Air bypass solenoid valve*3
Solenoid valve*5
(Choke opener)
jr'-f
Choke breaker diaphragm
Solenoid valve*5 (Main air bleed control system)
Solenoid valve (P/S)*1
Solenoid valve (A/C)*1
Engine control unit
Fuel pump
*1 If equipped
*2 FE and F8 ATX
*3 F8 MTX and FE
*4 MTX
*5 FE and F8
*6 F6
76G04A-008
4A—8
Page 375 of 1865
4A OUTLINE
FE 8Valve—Unleaded Fuel
Read valve Vacuum switch valve Air cleaner
Slow fuel cut
.. . solenoid valve Air bypass
solenoid^ valve^. Engine control unit
EGR control valve
Solenoid valve (for P/S)*
Solenoid valve (for A/C)*
Catalytic converter
* If equipped
4 A—10
76G04A-010
Page 376 of 1865
OUTLINE 4A
Exhaust System
Except FE 8Valve—Unleaded Fuel
Front silencer ATX
Main silencer
FE 8Valve—Unleaded Fuel
Exhaust manifold Catalytic converter
M
Only MTX
Front
Middle silencer
76G04A-011
4A-11
Page 378 of 1865
OUTLINE
4A
Previous
626
Unlead-
ed
fuel
O O O O O O X O O O X
Previous
626
Leaded
fuel
O X X O O X X X O X
New
626
FE
8
Valve
Unlead-
ed
fuel
o O O O O O X X O O O
New
626
Sin-
gapore
o O X O O m O
O
(FE
&
F8)
O
O
(FE
&
F8)
O O
New
626
Middle
East
o X X O O X X X X X O
New
626
General
X
O
(FE
& F8)
X O O X
O
(FE
&
F8)
O
(FE
&
F8)
O
(FE
&
F8)
X o
New
626
ECE
&
Hong
Kong
o O X O O * O O O O O o
Remark
• Adjustment
speed:
2,200
±
100
rpm
(in
neutral).
• MTX • Operation:
Coolant
tempera-
ture
more
than
50°C
(122°F).
Mechanical
type
Installed
on
carburetor.
Improvement
of
product
quality.
Function
Allows
throttle
to
gradually
close
during
deceleration.
Reduces
CO
and
HC
emission.
Detects
electrical
signal
from
in-
put
devices
and
controls
output
devices. Supplies
exhaust
gas
to
intake
manifold
to
reduce
NOx
Filters
fuel
Provides
fuel
to
carburetor.
Detects
when
throttle
valve
fully
closed. Opens
fuel
passage
to
secon-
dary
stage
of
carburetor.
Controls
shutter
valve
by
intake
air
temperature. Prevents
carburetor
icing.
Supplies
fresh
air
to
exhaust
manifold
to
reduce
CO
and
HC
emissions. Prevents
fuel
from
flowing
into
two-way
or
three-way
check
valve
Component
Dashpot Engine
Contorol
Unit
EGR
Control
Valve
Fuel
Filter
Fuel
Pump
Idle
Switch
Idle-up
Solenoid
Valve
Intake
Air
Temperature
Control
Valve
PTC
Heater
Reed
Valve
Separator
•a a> a -a .2-S
3
9-a a) 5 u- O UJ
z
Ox
111 IL •a c
V (-
U.ps •o
-
X
_ X
I-
o-t-
s ®
s
*
o *
oo
x to
U. UJ
u.
T- oi CO
4 A—13
Page 380 of 1865
OUTLINE 4A
SPECIFICATIONS
F6 & F8 Engine
Engine F6 F8
Specification General Singapore General
ECE,
Hong Kong, &
Singapore
Idle speed
rpm
MTX 800
+58
Idle speed
rpm
ATX 950
t5§
(in N range)|
900 +5§ (in N
range)
CO concentration
%
2.0
± 0.5
(Without secondary
air
injection)
Carburetor
Type Down draft, two barrel
Throat diameter
mm (in)
Primary 30 (1.18) Throat diameter
mm (in)
Secondary 34 (1.34)
Venturi diameter
mm
(in) Primary 23.5 (0.93) Venturi diameter
mm
(in) Secondary 29.0 (1.14)
Main nozzle
mm (in)
Primary 2.6 (0.10) Main nozzle
mm (in)
Secondary 2.8 (0.11)
Main
jet mm (in)
Primary MTX 1.10 (0.0433) 1.09 (0.0429) 1.14 (0.045)
Main
jet mm (in)
Primary ATX 1.10 (0.0433) 1.08 (0.0425) 1.12 (0.044) Main
jet mm (in)
Secondary 1.50 (0.059)
Main
air
bleed mm (in)
Primary MTX 0.60 (0.024) 0.60 (0.024) 0.55 (0.022) Main
air
bleed mm (in)
Primary ATX 0.60 (0.024) 0.80 (0.031) 0.60 (0.024) Main
air
bleed mm (in) Secondary 0.50 (0.020)
Slow
jet mm (in)
Primary 0.48 (0.019) 0.46 (0.018) Slow
jet mm (in)
Secondary 1.00 (0.039) 1.10 (0.043)
Slow
air
bleed mm (in)
Primary No.1 0.80 (0.031)
Slow
air
bleed mm (in)
Primary No.2 1.90 (0.075) Slow
air
bleed mm (in) Secondary No.1 1.00 (0.039) 0.80 (0.031) Slow
air
bleed mm (in) Secondary No.2 0.50 (0.020)
Power
jet mm (in)
0.50 (0.0201
Fast idle adjustment
mm (in)
Clearance between
Drimarv
throttle valve and bore
1.40-1.76 (0.055—0.069) MTX: 0.48-0.64 (0.019-0.025) ATX: 0.56-0.72 (0.022-0.028)
Float level adjustment mm (in)
Max. fuel flow
"L"
Clearance between
flo
44 (17.3)
at and
air
horn without aasket Float level adjustment mm (in) Fuel stop
"H"
12.5(0.49)
Clearance between float and
air
horn without aasket; float lowered
by
own weight
Choke breaker diaphragm mmHg (inHg)
Start 180-240 (7.1—9.5) 100-160 (3.9—6.3) Choke breaker diaphragm mmHg (inHg) Stop 290-350 (11.4—13.8) 220—280 8.7—11.01
Choke opener mmHg (inHg) Start 35-65 (1.4-2.6)
...
35-65 (1.4-2.6) Choke opener mmHg (inHg) Stop
......
130-190 (5.1-7.5) 130-190 (5.1-7.5)
Fuel tank capacity
Liters (US gal, Imp gal) 60 (15.9, 13.2)
Fuel Dump
Delivery pressure kPa (kg/cm2,
psi)
20-26 (0.20-0.27, 2.8—3.8)
Feeding capacity cc/min (cu in/min) More than 860 (52.5)
at
idle
Fuel filter
Type Paper element with magnet
Air cleaner
Fresh-Hot switching Manual Diaphragm type
Element tvoe Oil permeated paper
Fuel specification Leaded regular
76G04A-513
4 A—15
Page 381 of 1865
4A OUTLINE
FE Engine
Engine FE 8Valve FE 12Valve FE 8Valve
Specification General Middle East
ECE, Hong Kong, & Singapore Unleaded fuel
Idle speed
rpm
MTX 800
+5§
850
+5§
Idle speed
rpm
ATX 900
+58 (in N
range)
CO concentration
%
2.0
± 0.5
(Without secondary
air
injection)
Carburetor
Type Down draft,
two
barrel
Throat diameter
mm (in)
Primary 30 (1.18) Throat diameter
mm (in)
Secondary 34 (1.34)
Venturi diameter
mm (in)
Primary 23.5 (0.93) Venturi diameter
mm (in)
Secondary 29.0 (1.14)
Main nozzle
mm (in)
Primary 2.6 (0.10) Main nozzle
mm (in)
Secondary 2.8 (0.11)
Main
jet mm (in)
Primary MTX 1.14 (0.045) 1.09 (0.0429) 1.14 (0.045) 1.09 (0.0429) Main
jet mm (in)
Primary ATX 1.12 (0.044) 1.08 (0.0425) 1.12 (0.044) 1.09 (0.0429) Main
jet mm (in)
Secondary 1.55 (0.061) 1.50 (0.059) 1.55 (0.061) 1.50 (0.059)
Main
air
bleed
mm (in)
Primary MTX 0.50 (0.020) 0.60(0.024) 0.50 (0.020) 0.50 (0.020) Main
air
bleed
mm (in)
Primary ATX 0.55 (0.022) 0.80 (0.031) 0.55 (0.022) 0.50 (0.020) Main
air
bleed
mm (in) Secondary 0.50 (0.020)
Slow
jet mm (in)
Primary 0.46 (0.018)
Slow
jet mm (in)
Secondary MTX 1.10 (0.043) 1.00 (0.039) 1.10 (0.043) 0.90 (0.035) Slow
jet mm (in)
Secondary ATX 1.10 (0.043) 1.00 (0.039) 1.10 (0.043) 1.00 (0.039)
Slow
air
bleed
mm (in)
Primary No.1 0.80 (0.031)
Slow
air
bleed
mm (in)
Primary No.2 1.90 (0.075) Slow
air
bleed
mm (in) Secondary No.1 0.80 (0.031) 1.00 (0.039) 0.80 (0.031) 1.00 (0.039)
Slow
air
bleed
mm (in) Secondary No.2 0.50 (0.020)
Power
jet mm (in)
MTX 0.50 (0.020) 0.50 (0.020) Power
jet mm (in)
ATX 0.50 (0.020) 0.40 (0.016)
Fast idle adjustment
mm (in)
Clearance between primary throttle valve and bore
MTX 0.48—0.64
(0.019-0.025) 1.40—1.76
(0.055-0.069)
0.48—0.64
(0.019-0.025) 1.40-1.76
(0.055-0.069)
Fast idle adjustment
mm (in)
Clearance between primary throttle valve and bore ATX 0.56-0.72 (0.022—0.028)
1.40—1.76
(0.055-0.069) 0.56-0.72 (0.022—0.028)
1.40-1.76
(0.055-0.069)
Float level adjust-
ment
mm (in)
Max. fuel flow
"L"
Clearance between
flo
44 (17.3)
at and
air
horn without aasket Float level adjust-
ment
mm (in)
Fuel stop
"H" |
12.5(0.49)
Clearance between float and
air
horn without aasket: float lowered
bv
own weiaht
Choke breaker diaphragm mm-Hg (in-Hg)
Start 100-160 (3.9—6.3) 180—240 (7.1-9.4) 100-160
(3.9-6.3)
180-240
(7.1-9.4) Choke breaker diaphragm mm-Hg (in-Hg) Stop 220—280
(8.7-11.0)
290-350
(11.4-13.8)
220—280
(8.7-11.0)
290-350
(11.4-13.8)
Choke opener mmHg (inHg)
Start 80—120
(3.1-8.7)
30-70 (1.2-2.8) Choke opener mmHg (inHg)
Stop 220-280 (8.7—11.0) 130-190
(5.1-7.5)
Fuel tank capacity
Liters (US aal, Imp aal) 60 (15.9, 13.2)
Fuel DumD
Delivery pressure kPa (kg/cm2,
psi)
20-26 (0.20—0.27, 2.8-3.8) 20-29 (0.20-0.30, 2.8-4.3)
20-26 (0.20-0.27, 2.8-3.8)
Feedina caDacitv cc/min
feu
in/mini More than 860 (52.5)
at
idle
Fuel filter
Type Paper element with magnet
Air cleaner
Fresh-Hot switchina Diaphragm Manual Diaphragm Bimetal
Element
tvDe
Oil permeated paper
Fuel specification Leaded super
Unleaded super Leaded regular Leaded super Unleaded super Unleaded regular
76G04G-514
4A—16
Page 382 of 1865
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
Page 383 of 1865
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
Page 384 of 1865
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
Page 385 of 1865
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