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.
California Models
Actuation of the throttle controller is by the throttle control valve. See Fig 2. When the manifold vacuum exceeds a preset value, the valve opens and the vacuum is introduced into the throttle opener.
When intake manifold vacuum becomes less than the preset value, the valve is closed and the remaining vacuum in the throttle controller and the throttle control valve is returned to atmospheric pressure by the orifice.
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.