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.
Ford Motor Co. Cold Start Spark Hold: Description
Used on some 1979 engines only, the Cold Start Spark Hold System provides momentary spark advance hold during acceleration when engine is cold, and is used to provide improved cold engine acceleration. System consists of a Cold Start Spark Hold Ported Vacuum Switch (CSSH PVS), a restrictor, an intake manifold vacuum tap, and on some models, a Spark Delay Valve (SDV).
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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.