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 5 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EEC-IV)IGNITION SYSTEMPINPOINT TEST FDIAGNOSTIC AIDS
1991 Mercury Tracer Base, 4D Sedan, Automatic
Diagnostic Aids
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 1993 Mercury Tracer, 1993 Mercury Topaz, 1993 Mercury Sable, 1993 Mercury Grand Marquis, and 1993 Mercury Cougar. However, it is still accessible from the selected car via links, so may be relevant.
- An engine analyzer is used to diagnose problems in secondary side of ignition system.
- Visually inspect engine compartment to ensure vacuum hoses and spark plug wires are properly routed and securely connected.
- Examine all wiring harnesses and connectors for insulation damage and burned, overheated, loose and broken conditions.
- Ensure battery is fully charged and all accessories are turned off during testing.
- Use an engine analyzer or lab scope and EI Adapter (Rotunda 007-00044) in these testing procedures.
NOTE:
To provide accurate results, maintaining engine analyzer calibration is essential. Refer to equipment manual. If manual is not available, an estimate of calibration can be made by connecting Spark Tester (D81P-6666-A) to a properly operating ignition system and measuring firing voltage of spark tester. Spark tester firing voltage should be approximately 28 k/volts. DO NOT include firing voltage of rotor-to-cap gap.
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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.