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HOMESERVICE MANUALSFORD1996EXPLORER 4D UTILITY, 4.0 X, 4WD, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTING - 4.0LNO-START DIAGNOSISDISTRIBUTORLESS IGNITION SYSTEMSPARK CHECK
1996 Ford Explorer 4D Utility, 4.0 X, 4WD, Automatic

Spark Check

1996 Ford Explorer 4D Utility, 4.0 X, 4WD, AutomaticSECTION Spark Check
  1. Perform self diagnostic QUICK TEST to check for ignition-related fault codes, and repair as necessary. See QUICK TEST in the TESTS W/CODES - 4.0L article. If no fault codes are retrieved, check ignition system wiring harness connectors for corrosion and tight fit. See the WIRING DIAGRAMS - 4.0L article. Clean or repair connectors as necessary.
  2. 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 - 4.0L article.
RENDER: 1.0x

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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.