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 114 (ENGINE CONTROLS - TESTS W/O CODES)SYMPTOMSLOSS OF POWERSYMPTOM 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 Mark VIII. 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-IV article. If code is present, use appropriate CIRCUIT TEST.
- Check power to MAP/BARO sensor. See step 3) of CIRCUIT TEST S in the TESTS W/CODES - EEC-IV article.
- Check ignition system. See IGNITION SYSTEMS in the SYSTEM/COMPONENT TESTS article.
- Check fuel delivery system. See FUEL SYSTEM in the SYSTEM/COMPONENT TESTS article.
- Check for restricted exhaust system.
- Ensure engine operates at normal operating temperature.
- Check air intake system. Also, ensure throttle plate and linkages operate properly.
- Check engine compression. Check engine mechanical condition. Check intake manifold, manifold gasket, camshaft and valves.
- Ensure transmission is functioning properly.
- Check for binding/dragging brakes.
- Check EGR system. See the SYSTEM/COMPONENT TESTS article.
- Ensure A/C turns off during Wide Open Throttle (WOT). If A/C does not turn off during WOT, go to A/C CLUTCH DOES NOT DISENGAGE UNDER WOT CONDITIONS symptom.
- Check high speed fuel pump operation. See step 160) of CIRCUIT TEST XB in the TESTS W/CODES - EEC-IV article.
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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.