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 MANUALSMERCURY1987LYNX L, MTXIIIREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMFUEL INJECTION SYSTEM - 4-CYL DIESELTESTINGFUEL SYSTEM TESTINGAIR INTAKE RESTRICTION
1987 Mercury Lynx L, MTXIII
Air Intake Restriction
1987 Mercury Lynx L, MTXIIISECTION Air Intake Restriction
- Remove breather hose between intake manifold and camshaft cover. Install Line Adapter (10353) on breather nipple at intake manifold. Install cap on camshaft cover nipple. See Figure .
- Connect adapter line to H2O gauge. Run engine at 4000 RPM under no load. Restriction reading should not exceed 25 in. H2O. If more, replace filter element and check intake system for blockage.
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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.