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 DIESELTESTINGCOLD START DEVICE DIAGNOSISNOTES
1987 Mercury Lynx L, MTXIII
Cold Start Device Diagnosis: Notes
1987 Mercury Lynx L, MTXIIISECTION Notes
- Engine must be at normal operating temperature. Rotate CSD lever clockwise to stopper. Use Photoelectric Tachometer (Rotunda 99-0001) to check engine RPM.
- Engine speed must be 1450-1550 RPM. If not, check injection pump timing. See Figure . Check cold start device to verify proper operation. See Figure .
- Apply 20 in. Hg of vacuum to CSD diaphragm. CSD lever should move 1.1" (28 mm). If not, and vacuum diaphragms are not leaking, replace injection pump.
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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.