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DTC P0300: Random Misfire

  1. Check ignition spark and spark plug at cylinder misfiring. Repair as necessary. If a strong Blue spark is present at ignition wire and spark plug is okay, go to next step.
  2. Using a mechanic's stethoscope, check each fuel injector for a clicking sound while cranking engine. If sound is not heard from all 4 injectors, go to next step. If sound is heard from all 4 injectors, go to step 4).
  3. Check fuel injector harness and connections. Using a fuel injector tester (noid-light), check injector control signal at each harness connector. Repair as necessary. Retest system.
  4. Check ignition timing. See ADJUSTMENTS article. Adjust if necessary. Retest system. If ignition timing is okay, check EGR system for proper operation following procedures in DTC P0400  . Repair as necessary. If EGR operation is okay, check engine mechanical condition. See appropriate article in the ENGINES section.
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