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.
1980 Ford FiestaFACTORY OEM SERVICE PROCEDURE
AMERICAN Motors
- Check crankcase ventilation system with engine at idle. Remove PCV valve from grommet in rocker arm cover. Connect valve to PCV valve tester (J-23111 or equivalent). Use adaptor for 4-cylinder engine.
- Connect a vacuum gauge to central location of intake manifold to read vacuum. Start engine. With engine at idle, compare vacuum tester reading to flow chart. Replace valve with air flow rate above or below chart specifications.NOTE: PCV valve must be in a horizontal position and lightly tapped during tests (holding tester in a vertical position).American Motors PCV Valve Flow Rate Chart
Vacuum (In. Hg) Airflow (CFM) 4 Cyl. 6 Cyl. 15 69-1.13 50-1.00 6 77-1.66 1.05-1.85 3 1.22-2.21 1.50-2.50
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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