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.
Spark Timing Control: Description
Spark timing control system is used on 1977-78 1.8L and 1979 2.0L engines. This system aids in reduction of exhaust emissions by delaying spark port vacuum to distributor vacuum advance unit during acceleration. On 1979 models, system is operated by a spark delay valve, which is located in line between carburetor and distributor (Federal) or between water thermo valve and distributor (California).
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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