Idle Mixture and Speed Adjustments

Fig. 3 Idle Speed And Mixture Adjustment:

Fig. 4 Idle Speed And Mixture Adjustment:

1. Remove carburetor from engine.
2. Clamp carburetor in a vise with idle mixture adjusting screw (MAS) facing up (protect gasket surface from vise jaws).
3. Drill a 2mm pilot hole in the casting surrounding the idle mixture adjusting screw (MAS) then redrill the hole to 3mm. Fig. 3
4. Insert a blunt punch into the hole and drive out plug.
5. Reinstall carburetor on engine.
6. Run the cold engine at fast idle until the cooling water temperature is raised to 85 to 95°C (185 to 205°F).

ADJUSTMENT CONDITION: Lights, electric cooling fan and all accessories are off and transaxle in neutral.

7. Turn off the ignition key.
8. Disconnect the cable from the negative terminal of the battery for about 3 seconds. And then reconnect the cable to the original terminal.
9. Disconnect the connector of the exhaust oxygen sensor.
10. Run the vehicle for 5 minutes at the vehicle speed of 48 km/h (30 mile/hour), or run the engine for more than 5 seconds at the engine speed of 2,000 to 3,000 rpm.
11. Run the engine at idle for 2 minutes.
12. Set the idle CO (0.1 to 0.3% at nominal curb idle speed) and the engine speed by adjusting the idle speed adjusting screw Fig. 4, No. 1 (SAS-1) and the idle mixture adjusting screw (MAS) to the specified valve:
M/T = 500 to 800 rpm for the first 500 km (300 miles)
600 to 800 rpm after 500 km (300 miles)
A/T = 600 to 800 rpm, controlled by ISC system
13. Reconnect the connector of the exhaust oxygen sensor.
14. Reset the engine speed to the nominal idle speed by adjusting the speed adjusting screw, if the engine speed is out of the specified speed range.
15. Install the concealment plug into the hole to seal the idle mixture adjusting screw (MAS).