Fuel Delivery and Air Induction: Adjustments

1983-84 6-292 W/1ME CARBURETOR
A/C control must be in off position during adjustments. Perform adjustments with transmission in Neutral on all models.
1. Remove air cleaner for access to carburetor, but leave vacuum hoses connected. Disconnect and plug other hoses as directed by vehicle emission label.
2. Connect tachometer to engine following manufacturer's instructions. Start engine and run at fast idle until it reaches normal operating temperature.
3. Remove limiter cap from mixture adjusting screw, taking care not to damage screw.
4. Turn mixture screw in (clockwise) until lightly seated, then back screw out, just enough so engine will run.
5. Turn mixture screw counterclockwise (richer), 1/8 of a turn at a time until maximum idle RPM is obtained.
6. Adjust idle speed to higher value shown on vehicle emission label.
7. Repeat steps 5 and 6 to ensure correct adjustment.
8. Turn mixture screw clockwise (leaner), 1/8 of a turn at a time, until idle speed reaches the lower value shown on vehicle emission label.
9. Reset curb idle speed to specifications, then check and, if necessary, adjust fast idle to specifications.
10. Reconnect all vacuum hoses, install air cleaner, then recheck idle speed.