Step 1
- Remove the fuel tank. (6-3)
- Remove the ISC valve. (6-18)
- Connect the ISC valve coupler 1 and hoses 2.
- Connect the special tool (Mode select switch) to the dealer mode coupler. (5-18)
- Disconnect the vacuum hoses 3 from each throttle body.
- Connect the vacuum tester hoses 4 to each vacuum nipple on the throttle body.
Step 2
Warm up the engine as follows:
- Summer: approx. 5 min at idle r/min
- Winter: approx. 8 min at idle r/min
- Water temperature should be more than 80°C (176°F) and then wait 30 second.
- Then ISC valve automatically is set at throttle body synchronization position.
- Check for difference of vacuum between #1 and #2.
- Adjust the throttle valve synchronization and idling speed at 900 r/min by turning the air screw it necessary.
Caution: Avoid dirt drawn into the throttle body while running the engine without air cleaner chamber. Dirt drawn into the engine will damage the internal engine parts.
Note: Always set the engine rpm at 900 r/min.
- If the adjustment is not yet correct, remove each air screw and clean them with a spray-type carburetor cleaner and blow dry with a compressed air.
- Also, clean the air screw passageways.
Note:
- Slowly turn the air screw in clockwise and count the number of turns until the screw is lightly seated.
- Make a note of how many turns were made so the screw can be reset correctly after cleaning.
Step 3
Repeat the procedures of Step 2.