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.
1983 Mercury LN7 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
KOEO Code Menu
- If code 11 is displayed, Key On/Engine Off Test has been passed. Proceed to Timing Check.
- If code 15 is displayed, replace ECA and retest vehicle.
- If code 21 is displayed, perform Coolant Temperature Sensor Test.
- If code 23 is displayed, perform Throttle Position Sensor Test.
- If code 24 is displayed, problem is in air flow meter. See FORD MULTI-POINT FUEL INJECTION article.
- If code 26 is displayed, problem is in air flow meter. See FORD MULTI-POINT FUEL INJECTION article.
- If code 67 is displayed, perform Neutral Switch-A/C Input Test.
- If no codes, or any codes other than those listed are displayed, perform Diagnostic Circuit Test.
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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