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.
Speed Control Systems - Automatic: Description: Notes
This system uses manifold vacuum (except diesel) to power a throttle servo unit. Diesel equipped vehicles utilize a vacuum pump and regulator to supply required vacuum. When speed adjustment is necessary, servo moves the throttle by receiving varying amounts of controlled vacuum from a transducer assembly. The speedometer cable from the transmission drives the transducer, and a cable from the transducer drives the speedometer. The transducer is activated by a three position switch located at the end of the turn signal lever on the steering column. In addition, some models have an "ON-OFF" switch on the instrument panel to control the entire system.
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.