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Home >> Kia >> 2011 >> Optima LX, Standard >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition System - 2.4L >> Repair procedures >> On-Vehicle Inspection >> Inspect Spark Plug

Inspect Spark Plug

  1. Disconnect the ignition coil connectors (A).
    Fig 1: Ignition Coil Connectors
    G07381533Courtesy of KIA MOTORS AMERICA, INC.
  2. Remove the ignition coils (A).
    Fig 2: Ignition Coils
    G07381534Courtesy of KIA MOTORS AMERICA, INC.
  3. Using a spark plug socket, remove the spark plug.
    CAUTION: Be careful that no contaminates enter through the spark plug holes.
  4. Inspect the electrodes (A) and ceramic insulator (B).
    Fig 3: Electrodes & Ceramic Insulator
    G07381535Courtesy of KIA MOTORS AMERICA, INC.

    Inspection Of Electrodes 

    ELECTRODES REFERENCE CHART

    Condition Dark deposits White deposits
    Description
    • Fuel mixture too rich
    • Low air intake
    • Fuel mixture too lean
    • Advanced ignition timing
    • Insufficient plug tightening torque
  5. Check the electrode gap (A).

    Standard 

    Unleaded : 1.0 ~ 1.1 mm (0.0394 ~ 0.0433 in.)

    Fig 4: Checking Electrode Gap
    G07381536Courtesy of KIA MOTORS AMERICA, INC.
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