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Home >> Kia >> 2025 >> Seltos X-Line >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition System - 1.6L >> Spark Plug >> Troubleshooting
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Spark Plug: Troubleshooting

  1. Check the DTC code with the KDS (Refer to DTC INDEX ).
    G16423443Courtesy of KIA MOTORS AMERICA, INC.
  2. Check the ignition coil connectors (A).
    G16423444Courtesy of KIA MOTORS AMERICA, INC.
  3. Check the installation condition of the ignition coils (A).

    Tightening torque: 

    9.8 - 11.8 N.m (1.0 - 1.2 kgf.m, 7.2 - 8.7 lb.ft)

    G16423445Courtesy of KIA MOTORS AMERICA, INC.
  4. Remove the spark plug.

    (Refer to Spark Plug - "REMOVAL AND INSTALLATION ")

  5. Visually inspect the external spark plugs.

    Spark plug gap [mm (in.)]:  0.7 - 0.8 mm (0.0276 - 0.0315)

    Symptom Suspected Cause Correction
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    Melting electrode    		 Abnormal combustion, overheat Replace the spark plug
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    Carbon and foreign matter
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    Ring crack    		 Abnormal combustion, external Shock
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    Vertical crack    		 External shock
    G16423450Courtesy of KIA MOTORS AMERICA, INC.

    Overheat    		 Abnormal combustion
    G16423451Courtesy of KIA MOTORS AMERICA, INC.

    Poor gap    		 Physical damage Replace the spark plug
    G16423452Courtesy of KIA MOTORS AMERICA, INC.

    Flash over    		 Excessive electrode wear Replace the spark plug, ignition coil
    G16423453Courtesy of KIA MOTORS AMERICA, INC.

    Corrosion/Rust    		 Remaining oil mist Reassemble the spark plug
  6. Check the resistance between the spark plugs terminal (A) and probe (B) by using a multi-tester or a resistance meter.

    Specified value:  2 - 20 KΩ

    G16423454Courtesy of KIA MOTORS AMERICA, INC.
    NOTE:
    • Avoid the contact resistance between probe and spark plugs (when it occurs, the measured value is not stabilized).
    • Be careful not to damage center electrode (A) while measuring resistance.
    G16423455Courtesy of KIA MOTORS AMERICA, INC.
  7. Test for changing position of each ignition coil and spark plug.
    1. Remove the spark plug (A) and ignition coil (B) from the misfiring cylinder and exchange them with one of the other cylinders.

      (Refer to Spark Plug - "REMOVAL AND INSTALLATION ")

      G16423456Courtesy of KIA MOTORS AMERICA, INC.
    2. Replace the spark plugs, if misfire moves along the spark plugs.
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