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Home >> Kia >> 2020 >> Optima Plug-In Hybrid EX >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Ignition System (PHEV) >> Spark Plug >> Repair Procedures >> Cleaning >> 2nd Method
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2nd Method

NOTE: The 2nd method should be performed only if the 1st method fails (the misfire-related codes recur).
  1. Start the engine and keep the engine running at idle for 2 minutes.
  2. Drive the vehicle for over 20 minutes, keeping the engine speed above 3500 rpm.
    NOTE: If equipped with manual transaxle, shift the gear properly for keeping the engine speed above 3500 rpm.
    G13361558Courtesy of KIA MOTORS AMERICA, INC.