Throttle Positioner

With engine idle speed adjusted to specifications and engine at normal operating temperature, disconnect vacuum hose from positioner diaphragm and plug hose. Raise engine RPM slightly by depressing accelerator pedal to set throttle positioner in place, then adjust positioner adjusting screw to obtain 1400 RPM in neutral. Connect hose to positioner diaphragm. Throttle lever should become free from throttle positioner as soon as hose has been connected and engine should idle at specified idle speed. If operation is not correct, inspect throttle positioner linkage, diaphragm, vacuum switching valve and speed marker operation. Check vacuum hoses and connections for leaks.