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.
1979 Ford FiestaFACTORY OEM SERVICE PROCEDURE
Spark Delay Valve
- Remove valve from vacuum line and attach colored end of spark delay valve to an external vacuum source. Using a piece of vacuum tubing, attach white end of valve to a vacuum gauge.
- Apply 10 in. Hg, using an external vacuum source, and note reading on gauge and time for reading to be reached. Vacuum gauge should read from zero to 8 in. Hg in 2-5 seconds for Brown and White valve or in 9-20 seconds for a Green and White valve.
- If reading does not reach 8 in. Hg and/or is not within specified time range, replace spark delay valve.
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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