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CHK
ADJ
SYNCHRONIZING THE THROTTLE BODIES
7. Measure:
• engine idling speed
Out of specification → Adjust.
Refer to “ADJUSTING THE ENGINE
IDLING SPEED”.
Engine idling speed
1,000 ~ 1,100 r/min
8. Adjust:
• throttle body synchronization
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a. With throttle body #3 as standard, adjust
throttle bodies #1, #2, and #4 using the air
screw 1.
NOTE:
@
• After each step, rev the engine two or three
times, each time for less than a second, and
check the synchronization again.
• If the air screw is removed, turn the screw 3/4
turn in and be sure to synchronize the throttle
body.
CAUTION:
Do not use the throttle valve adjusting screws
to adjust the throttle body synchronization.
NOTE:
@
The difference in vacuum pressure between
two throttle bodies should not exceed 1.33 kPa
(10 mm Hg).
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9. Measure:
• engine idling speed
Out of specification → Adjust.
Make sure that the vacuum pressure is
within specification.
10.Stop the engine and remove the measuring
equipment.
Carburetor angle driver
90890-03158
Vacuum pressure at engine idling
speed
28.9 ~ 36.8 kPa
(220 ~ 280 mm Hg)