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Vacuum Throttle Positioner: Adjustment

  1. Start engine and accelerate to about 2000 RPM. Verify throttle positioner operation. Throttle positioner must withstand hand pressure. Manually open throttle until engine reaches a speed of approximately 2500 RPM on "M" models, 2000 RPM on all other models. Loosen lock nut and adjust throttle positioner until it just contacts throttle lever.
  2. Release throttle lever, then slowly adjust positioner until a sudden drop in speed occurs (over 1000 RPM). At this point, continue adjusting positioner in a decreasing direction for an additional 1/4 turn and tighten lock nut. Accelerate engine until it reaches a speed of approximately 2300 RPM on "D" and "W" models, 2500 RPM on all other models, and release throttle. Engine should return to normal idle speed.
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