1. Vacuum (Apply
-30
w
-50
cm
Hg
vacuum)
2. Choke piston rod
3. Screw driver
4. Choke valve to carburetor bore clearance
Fig.
4-
l-54 Moving choke piston rod
Fast Idle Adjustment
NOTE:
Fast idle check and adjustment should be per-
formed after making sure of the following.
l Ambient temperature is between
22°C
and
28°C
(71°F and 82°F).
*Idle up system (idle up speed) is normal.
Check and adjustment procedure is as follows.
1) Leave car at a place where ambient tempe-
rature is between 22°C and 28°C (71°F and
82”F),
for over 4 hours.
NOTE:
When carburetor is removed, leave carburetor at
the place mentioned above for an hour and
check as follows.
2) After leaving, make sure that the mark on
cam and the center of cam follower are in
alignment as shown in below figure.
Fast idle cam
Mark on cam
Cam follower
3) Disconnect vacuum hose from TWSV and
connect special tool (vacuum pump gauge) to
its hose.
,
1.
2.
3.
4.
5.
6.
7.
8.
Twsv
Vacuum hose
Idle up actuator
Clearance
Actuator rod
Idle up adjusting screw
Fast idle adjusting screw
Special tool (Vacuum pump gauge)
With applying about 40
cmHg
vacuum to
actuator.
4) Check clearance between actuator rod and
idle up adjusting screw.
Clearance “4”
for fast idle
2.5
-
3.0 mm
(O.lO-
0.12 in.)
If clearance is out of specification, adjust it
to specification with tast idle adjusting
screw-
Unloader Adjustment
Perform this check and adjustment when engine
is cool.
1) Remove air intake case.
2) Make sure that choke valve is fully closed.
3) Fully open throttle valve and check choke
valve to carburetor bore clearance to ensure it
is within following specification.
Fig. 4- l-55 Mark on cam and cam follower
4-24
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