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Spark Output Check

  1. Check for trouble codes stored in PCM and repair if necessary. See QUICK TEST in TESTS W/CODES article. If no trouble codes are retrieved, check ignition system wiring harness connectors for damage, corrosion and tight fit.
  2. If no fault codes are retrieved and vehicle will start, go to TESTS W/O CODES article. If no fault codes are retrieved and vehicle is a no-start, connect a high-output spark tester between ignition coil wire and engine ground. Check for spark at coil wire while cranking engine. A consistent Blue spark should be present.
  3. If spark is present, go to step 4). If no spark is present, remove distributor cap and crank engine to ensure distributor rotor rotates. If okay, check resistance of coil secondary wire. Resistance should be less than 9100 ohms per foot. Service coil wire if necessary and retest. If spark is not present, go to CIRCUIT TEST A in TESTS W/CODES article.
  4. If a consistent Blue spark is present at coil wire during cranking, inspect distributor cap and rotor for cracks or carbon tracking. Service as necessary and test spark output at spark plugs. If spark is present at spark plugs and engine will not start, go to TESTS W/O CODES article.
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