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Home >> Saturn >> 2001 >> L300 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0300: Engine Misfire Detected >> Diagnostic Procedures
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Diagnostic Procedures

  1. Operate engine for one minute. Using scan tool, monitor current misfire counters. If any current counters are incrementing, go to next step. If no current counters are incrementing, problem is intermittent. See DIAGNOSTIC AIDS  .
  2. If a particular counter is dominant, see DTC P0301-P0306: SPECIFIC CYLINDER MISFIRE DETECTED  . If a particular counter is not dominant, go to next step.
  3. Ensure that MAF or EGR solenoid DTCs are not set. If any of these DTCs are set, diagnose affected DTC(s) first. If no other DTCs are set, perform fuel pressure test, injector leak-down test or injector balance test. Check faulty spark plugs, internal mechanical engine failure, faulty injector or for fuel quality. See appropriate SYSTEM & COMPONENT TESTING article.
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