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.
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HOMESERVICE MANUALSMERCURY1983LYNX LS, 4D HATCHBACK, 1.6 5, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMPCV SYSTEMTESTING
1983 Mercury Lynx LS, 4D Hatchback, 1.6 5, Standard
PCV System: Testing
1983 Mercury Lynx LS, 4D Hatchback, 1.6 5, StandardSECTION Testing
- Start engine and warm to normal operating temperature. Engine should be running at curb idle speed. Remove PCV valve from its mounting.
- If valve is functioning properly, a hissing noise will be heard as air is drawn through valve. Place finger over PCV valve inlet. A strong vacuum should be felt.
- If no vacuum is felt at PCV valve, check for blockage or restriction in PCV valve hose. If hose is okay, replace PCV valve. While finger is over inlet of valve, check for vacuum leaks in hose and at all connections.
- Turn engine off. Remove PCV valve from hose. Shake PCV valve. A clicking noise should be heard when shaking valve, indicating valve is free. If no clicking noise is heard, replace PCV valve.
RENDER: 1.0x
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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.