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Spark Check

WARNING: This page is about a different car, the 1995 Ford Ranger, 1995 Ford Explorer, and 1995 Ford Aerostar. However, it is still accessible from the selected car via links, so may be relevant.
  1. Perform self diagnostic QUICK TEST to check for ignition-related fault codes, and repair as necessary. See QUICK TEST in appropriate G -TESTS W/CODES article in the ENGINE PERFORMANCE section below. If no fault codes are retrieved, check ignition system wiring harness connectors for corrosion and tight fit. See appropriate wiring diagram under WIRING DIAGRAMS  . 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, go to IGNITION SYSTEMS in appropriate SYSTEM/COMPONENT TESTS - EEC-IV (4.0L) (for Aerostar And Explorer only). For additional testing information for Ranger, proceed to TESTS W/CODES - EEC-V (4.0L) .
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