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.
1981 Ford Escort Base, 2D HatchbackFACTORY OEM SERVICE PROCEDURE
Cold Start Spark Advance System: Testing
- To test both CSSA PVS and Coolant PVS, connect a vacuum gauge to port "D" and an unrestricted vacuum source to port "2". See Fig 1. With engine cold, no vacuum should be indicated. Warm engine to normal operating temperature and vacuum should be indicated at CSSA PVS with engine at normal idle.
- To further check coolant PVS, connect a "T" fitting and vacuum gauge in hose "D" with all other hoses connected. Gauge should not exceed 2 in. Hg vacuum at normal idle. In an artificially overheated engine (above 235°F), gauge should read full manifold vacuum. If above conditions are not met, replace defective valve(s).NOTE: See also Ford Motor Co. Spark Delay Valves in this section.
Factory Service Tools
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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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