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5-26 FUEL SYSTEM AND THROTTLE BODY
THROTTLE VALVE SYNCHRONIZATION
Check and adjust the throttle valve synchronization among four
cylinders.
Step 1
• Lift and support the fuel tank. (5-3)
•
Start up the engine and run it in idling condition for warming up
.
• Stop the warmed-up engine.
• Disconnect the IAP sensor coupler 1 .
• Disconnect the vacuum hose 2 from each throttle body.
• Connect the vacuum tester hose 3 to each vacuum nipple on
the throttle body.
Step 2
• Connect a tachometer and start up the engine.
• Bring the engine r/min to 1 300 r/min by the throttle stop
screw.
• Check the vacuum of the four cylinders and balance the four
throttle valves with the balance screw 4 .
NOTE:
* During balancing the throttle valves, always set the engine
r/min at 1 300 r/min, using throttle stop screw.
* After balancing the four valves, set the idle r/min to 1 300 r/min
by the throttle stop screw.
* If the above procedures cannot still synchronize the valves,
proceed to the next step.
Avoid dirt drawn into the throttle body while running
the engine without air cleaner box cover. Dirt drawn
into the engine will damage the internal engine parts.