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 MANUALSMERCURY1985LYNX BASE, 2D HATCHBACK, 1.9 9, MTXIIREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEADJUSTMENTTUNE-UP - 4-CYLADJUSTMENTSHOT (SLOW) IDLE RPM (1.6L 2-BBL.)MODELS WITH IDLE SPEED CONTROL (ISC)
1985 Mercury Lynx Base, 2D Hatchback, 1.9 9, MTXII
Models With Idle Speed Control (ISC)
1985 Mercury Lynx Base, 2D Hatchback, 1.9 9, MTXIISECTION Models With Idle Speed Control (ISC)
- Place transmission or "P" (auto. trans.) or Neutral (man. trans.). Place A/C heater selector in "OFF" position. Start engine and warm to normal operating temperature. Disconnect and plug vacuum hose at by-pass section of thermactor air control valve.
- Place fast idle adjusting screw on 2nd highest step of fast idle cam. Run engine until cooling fan comes on. Slightly depress throttle to allow fast idle cam to rotate. Place transmission in "D" (auto. trans.) and check idle speed.
- If adjustment is required: Place transmission in "P" (auto. trans.). Disconnect and plug vacuum hose from ISC. Connect vacuum pump to ISC and apply enough vacuum to retract ISC plunger clear of ISC adjusting screw.
- Place transmission in "D" (auto. trans.), if RPM is not within specification, turn throttle stop adjusting screw to obtain specified RPM. Place transmission in "P" (auto. trans.). Remove vacuum pump and plug from ISC hose and connect hose to ISC.
- Place transmission in "D" (auto. trans.), if RPM is not within specification, adjust RPM by turning ISC adjustment screw. See Fig 1 . Place transmission in "P" (auto. trans.).
- Momentarily increase engine RPM, place transmission in "D" (auto. trans.) and recheck idle speed. Remove test equipment and return vacuum hoses to original locations.
CURB IDLE SPEED (RPM) (1.6L 2-BBL. MODELS W/ISC MOTOR)
| Application | ISC "Off" | ISC "On" |
|---|---|---|
| 1.6L 2-Bbl. | 670 | 700 |
RENDER: 1.0x
NO RELATED
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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.