4-78 FI SYSTEM AND INTAKE AIR SYSTEM
• Connect one of the four rubber hoses of the vacuum balancer
gauge to the nipple 1 on the No.1 throttle body.
 09913-13121: Vacuum balancer gauge
• Connect a tachometer.
• Start up the engine and keep it running at 1 200 rpm by turning
throttle stop screw 2.
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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.
• Turn the air screw 3 of the gauge so that the vacuum acting on
the tube of that hose will bring the steel ball 4 in the tube to the
center line 5.
NOTE:
The vacuum gauge is positioned approx. 30° from the horizontal
level.
• After making sure that the steel ball stays steady at the center
line, disconnect the hose from the No.1 throttle body nipple
and connect the next hose to this nipple.
• Turn air screw to bring the other steel ball 6 to the center line.
• Repeat the above process on the third and fourth hoses.
The balancer gauge is now ready for use in balancing the throttle
valves.
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