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 MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 111 (ENGINE CONTROLS - TESTS W/O CODES)SYMPTOMSSPARK KNOCKSYMPTOM CHECKS
1991 Mercury Tracer Base, 4D Sedan, Automatic
Symptom Checks
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Symptom Checks
WARNING: This page is about a different car, the 1995 Lincoln Continental. However, it is still accessible from the selected car via links, so may be relevant.
Check the following items:
- Perform QUICK TEST. See the TESTS W/CODES - EEC-V article. If code present, perform appropriate CIRCUIT TEST.
- Check cooling system for overheating. If cooling system is overheating, go to ENGINE RUNS HOT symptom.
- Check ignition timing. See ADJUSTMENTS article.
- Check EGR system. See the SYSTEM & COMPONENT TESTING - EEC-V article.
- Check engine compression. Check engine mechanical condition. Check intake manifold gasket, camshaft and valves.
- Check ignition system. See CIRCUIT TEST JB in the TESTS W/CODES - EEC-V article.
- Check PCV system. See CIRCUIT TEST HG in the TESTS W/CODES - EEC-V article.
- Check octane adjust system. See step 5) of CIRCUIT TEST FG in the TESTS W/CODES - EEC-V article. If available, check Technical Service Bulletins (TSBs) for OCT ADJ information.
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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.