TSB : Tune-Up Trouble Shooting

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Expand All (for easy ctrl-f) Collapse All Condition & Possible Cause Spark Plug Diagnosis Normal Spark Plug Condition Cold Fouling or Carbon Deposits Wet Fouling or Oil Deposits Gap Bridged Blistered Electrode or Overheating Pre-ignition or Melted Electrodes Chipped Insulators Rust Colored Deposits Electronic Ignition Diagnosis Notes Engine Will Not Start Engine Runs Rough Component Failure Electronic Ignition Diagnosis By Oscilloscope Pattern Firing Voltage Lines are the Same, but Abnormally High Firing Voltage Lines are the Same, but Abnormally Low One or More, but Not All Firing Voltage Lines are Higher Than the Others One or More, but Not All Firing Voltage Lines are Lower Than the Others One or More Cylinders Not Firing General Diagnosis Hard Starting Detonation Dieseling Faulty Acceleration Faulty Low Speed Operation Faulty High Speed Operation Misfire at All Speeds Hesitation Rough Idle, Missing or Stalling Engine Surges Ping or Spark Knock Poor Gasoline Mileage Power Not Up to Normal Engine Stalls