1975 Datsun 280z FSM - Spooled up Racing

Engine Fuel
Direction of bimetal movement with
increasing temperature
ft.
CJ
17.1 ,
S'
a.
v
17.1
14.1
14.1 ' >^
o
53
23
0
1.3
0
o
V
1.3
Air flow area at 20°C (68°F) ambient
TIME (minutes) O 50 100 130 200
Atmospheric temperature at engine starting
EF321
Fig. EF-28 Air regulator characteristic curve
16. Throttle chamber
The throttle chamber, located between
the intake manifold and air flow
meter, is equipped with a valve. This
valve controls the intake air flow in
response to accelerator pedal movement.
The rotary shaft of this valve is
connected to the throttle valve switch.
This valve remains closed during
engine idling, and the air required for
idling passes through the bypass port
into the intake manifold. Idle adjustment
is made by the idle speed adjusting
screw located in the bypass port.
There is another bypass line in this
throttle chamber to pass sufficient air
through the air regulator into the
intake manifold when a cold engine is
started.
Throttle chamber
Fig. EF-29
EF358
Throttle chamber
17. Harness
One wiring harness is used to connect
lines between the control unit
and the related major units.
The harness from the 35-pin connector
connected to the control unit is
combined with the relay harness at the
side dash on the driver's side and runs
to the engine compartment where it is
combined with the dropping resistor
harness. From the engine compartment,
the harness runs to various
units; the air flow meter, air temperature
sensor, throttle valve switch, air
regulator, injector, cold start valve,
etc.
Connectors are used only in the line
Fig. EF-30 Electronic fuel injection harness
between the 35-pin connector and tween the cold start valve and thermowater
temperature sensor, and be- time switch.
EF-17