Idle Up Control Valve: Adjustments

VACUUM THROTTLE POSITIONER, ADJUST
1. Start engine and allow to idle in neutral, then accelerate engine to above 2000 RPM to make sure that throttle positioner operates and can maintain its position when a hand load is applied. If not, determine cause of malfunction and correct as necessary as described under ``Testing'' procedure before proceeding further.
2. Accelerate engine to about 2500 RPM then loosen positioner adjustment lock nut and rotate positioner assembly until it just contacts throttle lever.
3. Release throttle and adjust positioner to decrease engine speed until a sudden drop in speed occurs (over 1000 RPM). Continue adjusting positioner in decreasing direction 1/4 turn and tighten lock nut.
4. Accelerate engine to about 2500 RPM and release throttle. If engine speed returns to normal idle, throttle positioner is properly adjusted.