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Home >> Kia >> 2016 >> Optima Hybrid >> Repair and Diagnosis >> Engine Performance >> Tune-Up >> Ignition System (HEV) >> Ignition System >> Repair Procedures >> On-Vehicle Inspection >> Inspect Spark Plug

Inspect Spark Plug

  1. Disconnect the ignition coil connectors (A).
    Fig 1: Disconnecting Ignition Coil Connectors (A)
    G11815582Courtesy of KIA MOTORS AMERICA, INC.
    NOTE: When disconnecting the ignition coil connector, pull out the locking pin (A) and then pull out the connector while pressing the clip (B).
    Fig 2: Pressing Clip (B) To Disconnect Ignition Coil
    G11815583Courtesy of KIA MOTORS AMERICA, INC.
  2. Remove the ignition coils (A).

    Tightening torque: 

    3.9 ~ 5.9 N.m (0.4 ~ 0.6 kgf.m, 2.9 ~ 4.3 lb-ft)

    Fig 3: Removing Ignition Coils (A)
    G11815584Courtesy 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 4: Inspecting Electrodes (A) And Ceramic Insulator (B)
    G11815585Courtesy of KIA MOTORS AMERICA, INC.
    Inspection Chart Of Electrodes

    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 value: 

    1.0 ~ 1.1 mm (0.0394 ~ 0.0433 in.)

    Fig 5: Checking Electrode Gap (A)
    G11815586Courtesy of KIA MOTORS AMERICA, INC.
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