Throttle Positioner

Oil temperature should be between 122-158°F, measured at dipstick tube. Check idling speed and correct if necessary. Idling speed for manual transmission is 850±50 RPM. No throttle positioner is used on vehicles with automatic transmissions. Check fast idle speed and, if necessary, adjust as follows. Pull special lever against stop and adjusting screw on bracket. Adjust by turning adjusting screw to following specifications.

Fig 1: CUT - AWAY OF THROTTLE POSITIONER (1970-72 MODELS)

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

After a warm up drive, check that fast idle speed does not exceed 1700 RPM for 1971-73 Type I vehicles, or 1900 RPM for 1971-73 Type II. When installing a new throttle positioner, pull rod must be adjusted. Special lever must not touch carburetor body or throttle valve lever when throttle valve is closed. Adjust screw ("12") on control valve so that valve closing time from release of throttle lever at 3000 RPM is to following specifications.

Fig 2: Control Valve & Throttle Positioner (1970-72 Models)

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

If time is shorter, turn adjusting screw clockwise, if time is longer, turn adjusting screw counterclockwise. After a warm up drive, a closing time of six seconds must not be exceeded.