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Home >> Kia >> 2020 >> Optima Plug-In Hybrid EX >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 59 (Ignition System (HEV)) >> Spark Plug >> Repair Procedures >> Cleaning >> Notes
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Repair Procedures: Cleaning: Notes

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The combustion temporarily becomes unstable, due to the aged fuel and the carbon deposits accumulated on the spark plug(s) after long-term storage.