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.
Ignition Timing Control - Rotary: Description
Ignition control system is used to regulate operation of leading and trailing systems of distributor to help reduce hydrocarbon (HC) and carbon monoxide (CO) emissions by aiding converter warm-up during cold engine starts. System consists of leading and trailing components of distributor, control unit (if equipped), vacuum control valve (if equipped), idle switch, relays and connecting wiring and tubing.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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