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 PERFORMANCESYSTEMFUEL INJECTION SYSTEM - MULTI-POINTTESTING & DIAGNOSISFUEL SYSTEM
1983 Mercury Lynx LS, 4D Hatchback, 1.6 5, Standard
Fuel System
1983 Mercury Lynx LS, 4D Hatchback, 1.6 5, StandardSECTION Fuel System
- Connect fuel pressure gauge to pressure relief valve on fuel rail assembly. See Figure . Pressurize fuel system by starting and running engine or turning ignition off and to "RUN" position several times. Fuel pressure should be 35-45 psi (2.5-3.0 kg/cm2 ).
- If pressure is not correct, check to ensure ignition coil is connected. Ensure that injectors, fuel pressure regulator or fuel delivery lines and connections are not leaking.
- If no pressure reading can be obtained, check fuel pump circuit. When fuel pressure is obtained, turn key off. Pressure must not drop more than 4 psi (.3 kg/cm2 ) within 2 minutes after ignition is turned off.
- If pressure drops more than specified, check for hydrostatic lock, leaking injector and/or faulty pressure regulator.
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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.