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DTC P0300: RANDOM MISFIRE Suzuki X-90 I

Testing & Diagnostics ~147 words
  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»(ref-26178) article. Adjust if necessary. Retest system. If ignition timing is okay, check EGR system for proper operation following procedures in «DTC P0400»(ref-26219-S30513589112001010500000) . Repair as necessary. If EGR operation is okay, check engine mechanical condition. See appropriate article in the ENGINES section.

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