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Tune-Up
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Tune-Up Trouble Shooting
Tune-Up Trouble Shooting
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Tune-Up Trouble Shooting
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