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Home >> Kia >> 2015 >> Optima Hybrid >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition System - Optima HEV >> Repair Procedures >> On-Vehicle Inspection >> Inspect Spark Plug
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Inspect Spark Plug

  1. Disconnect the ignition coil connectors (A).
    Fig 1: Ignition Coil Connectors
    G08312682Courtesy 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: Pulling Out Locking Pin & Ignition Coil Connector
    G08312683Courtesy of KIA MOTORS AMERICA, INC.
  2. Remove the ignition coils (A).

    Tightening torque: 

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

    Fig 3: Ignition Coils
    G08312684Courtesy 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: Spark Plug Electrodes & Ceramic Insulator
    G08312685Courtesy of KIA MOTORS AMERICA, INC.
    INSPECTION 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
G08312686Courtesy of KIA MOTORS AMERICA, INC.