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Spark Check

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  1. Perform self diagnostic QUICK TEST to check for ignition-related fault codes, and repair as necessary. See QUICK TEST in appropriate SELF-DIAGNOSTICS article. If no fault codes are retrieved, check ignition system wiring harness connectors for corrosion and tight fit. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. Clean or repair connectors as necessary.
  2. If wiring and connectors are okay, use Spark Tester (303-D037 or D8IP-6666-A) to check for spark at each spark plug wire while cranking engine. If Blueish-White spark is present at each cylinder, ignition system is okay. If Blueish-White spark is not present at each cylinder, inspect spark plugs at missing cylinders. Measure resistance of spark plugs. Replace spark plug if resistance reading is less than 2000 or more than 20,000 ohms.
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