fuel pump MAZDA 626 1987 Owner's Manual
[x] Cancel search | Manufacturer: MAZDA, Model Year: 1987, Model line: 626, Model: MAZDA 626 1987Pages: 1865, PDF Size: 94.35 MB
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 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
Page 386 of 1865
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
Page 387 of 1865
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
Page 389 of 1865
4A FUEL SYSTEM
FUEL SYSTEM
This system consists of the fuel pump, fuel filters, and carburetor, and supplies the necessary fuel for
operation of the engine.
76G04A-025
4A—24
Page 390 of 1865
FUEL SYSTEM 4A
TROUBLESHOOTING
POSSIBLE CAUSE
\ PAGE Carburetor Fuel pump Separator
Two-way check valve (Except Middle East) Three-way check valve (Middle East)
SYMPTOM 4A—26 4A—35 4A—37 4A—37
1 Hard start or won't start (Cranks OK) 2 1
2 Engine stalls During warm up 2 1 2 Engine stalls After warm up 2 1
3 Rough idle During warm up 2 1 3 Rough idle After warm up 2 1
4 High idle speed after warm up 1
5 Poor acceleration, hesitation, or lack of power 2 1
6 Runs rough on deceleration 1
7 Afterburn in exhaust system 1
8 Poor fuel consumption 1 2 3
9 Fails emission test 1
76G04A-026
4A-25
Page 392 of 1865
FUEL SYSTEM 4A
Disassembly
FE and F8 (General, ECE, Hong Kong, and Singapore)
76G04A-028
Disassemble in the sequence shown in the figure.
1. Lever
2. Secondary diaphragm
3. Choke breaker diaphragm and thermo wax
(If equipped)
4. Choke opener and bracket (If equipped)
5. Air horn
6. Float
7. Needle valve
8. Accelerator pump
9. Slow fuel cut solenoid valve
10. Idle-up solenoid valve and idle switch
(If equipped)
11. Air bleeds and jets
12. Injector weight
13. Primary venturi and nozzle
14. Secondary venturi and nozzle
15. Main body
16. Throttle body
4A—27