Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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.
| 1968-70 Type I & II | 1700-1800 RPM |
| 1971-73 Type I | 1450-1650 RPM |
| 1971 Type II | 1650-1850 RPM |
| 1972-73 Type II | 1450-1650 RPM |
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.
| 1968-70 Type I & II | 3-4 sees. |
| 1971-73 Type I | 3.5±1 sees. |
| 1971-73 Type II | 4.0±1 sees. |
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.
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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