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* During balancing the throttle valves, always set the engine
rpm at
1 150 rpm, using throttle stop screw.
* After balancing the four valves, set the idle rpm to 1 150 rpm
by the throttle stop screw after installing the air cleaner box.
* If the above procedures cannot still synchronize the valves,
proceed to the next step.
THROTTLE VALVE SYNCHRONIZATION
Step 1
• Disconnect the lAP sensor coupler
CD.
• To synchronize throttle valves, remove the vacuum hoses
(2)
from each vacuum nipple and connect the vacuum balancer
gauge hoses to the vacuum nipples respectively.
,root.
09913-13121: Vacuum balancer gauge
Step 2
• Connect a tachometer and start up the engine.
• Bring the engine rpm to 1 150 rpm by the throttle stop screw.
• Check the vacuum of the four cylinders and balance the four
throttle valves.
The vacuum gauge is positioned approx. 30
0 from the horizon-
tal level, and in this position the four balls should be within one
ball dia. If the difference is larger than one ball, turn the balance
adjusting screw on the throttle body and bring the ball to the
same level.
A correctly adjusted throttle valve synchronization has the balls
in the NO.1 through 4 at the same level.
ICAUTION I
Avoid drawing
dirt
into
the throttle
body
while running
the engine
without
air
cleaner box. Dirt drawn
into
the
engine will damage the internal engine parts.
FUEL
SYSTEM
AND
THROTILE
BODY
5·27