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 140 (ENGINE CONTROLS - BASIC TESTING - 5.0L)NO-START DIAGNOSISDISTRIBUTORLESS IGNITION SYSTEMSPARK CHECK
1991 Mercury Tracer Base, 4D Sedan, Automatic
Spark Check
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Spark Check
WARNING: This page is about a different car, the 1996 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
- Perform self diagnostic QUICK TEST to check for ignition-related fault codes, and repair as necessary. See QUICK TEST in the TESTS W/CODES - 5.0L article. If no fault codes are retrieved, check ignition system wiring harness connectors for corrosion and tight fit. See the WIRING DIAGRAMS - 5.0L article. Clean or repair connectors as necessary.
- If wiring and connectors are okay, use Neon Bulb Spark Tester (D89P-6666-A) to check for spark at each spark plug wire while cranking engine. If spark is strong and consistent at each spark plug (one spark per crankshaft revolution), ignition system is okay. If spark is not present, see test procedures under IGNITION SYSTEMS in the TESTS W/CODES - 5.0L 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.