1975 Datsun 280z FSM - Spooled up Racing

5. If harnesses are normal, check
operation of control unit.
6. If sounds are heard from either
Nos. 1, 2 and 3 injectors or Nos. 4, 5
and 6, replace control unit.
7. When disconnecting hoses from
injector, refer to Page 69, "Replacing
injector hose".
Cautions: Observe the following instructions
when assembling fuel
lines.
a. Do not install fuel hose clamps
after removal.
b. Clean dust and dirt from parts with
compressed air when assembling.
c. Be sure to install 13.5 mm (0.531
in) hose clamps on the injector and
fuel pipe side. Each clamp has a size
mark on it.
d. If rubber hoses are scratched or
deformed on the inner wall, replace.
e. After inserting fuel hose into fuel
pipe securely, clamp at a position
10 mm (0.394 in) from the hose
end.
o
O 15
Engine Fuel
2. Disconnect air hoses from both
end of air regulator, and visually check
to see if air regulator valve opens.
The valve opening at a temperature
of 20°C (68° F) is as shown in Figure
EF-91.
3. Disconnect electric connector of
air regulator, and check continuity.
Continuity should exist. If not, air
regulator is faulty.
4. Pry air regulator valve to open
with a flat-bladed screwdriver, then
close.
17.1
14.1
EF340
Direction of bimetal movement with
increasing temperature
Air flow area at 20°C (68°F) ambient
Fig. EF-91 Valve opening at a
temperature of20°C (68°F)
17.1
14.1 ' ^\
About 10 (0.394) —
T
o
S *
o
C
< o
2S
O
W
O
V
Unit: mm (in)
EF324
Fig.EF-89 Clamp position (2)
EF341
TIME (minutes)
Test results
If valve opens and closes smoothly,
it is operating properly. If not, replace.
16. Throttle chamber
1. Remove throttle chamber.
Throttle valve
O SO 100 ISO 200
Atmospheric temperature at engine starting
Fig. EF-92
Air flow characteristic curve
2. Make sure that throttle valve
moves smoothly when throttle lever is
manipulated.
3. Make sure that bypass port is free
from obstacles and is clean.
Dash pot
Fig. EF-90 Installing injector hose
15. Air regulator
1. Hold rubber hose in the line
between throttle chamber and air regulator
with fingers.
• Engine speed should be reduced.
If not, proceed as follows:
Checking throttle chamber
EF-58
Checking dashpot
EF415
Fig. EF-93 Throttle chamber