{"product_id":"ignition-coil-spark-plugs-for-kia-optima-2005-2006-2-4l","title":"Ignition Coil + Spark Plugs for Kia Optima (2005-2006) 2.4L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Spark Plug Tune-Up Kit for 2005-2006 Kia Optima\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The ignition coil and spark plug kit replaces degraded ignition components on the 2005-2006 Kia Optima 2.4L to eliminate misfires, stabilize idle rpm, and restore factory combustion efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Kia Optima Thermal Degradation\u003c\/h3\u003e\n\u003cp\u003eUnder repeated engine thermal cycling, the factory ignition packs on the \u003cstrong\u003eMS\u003c\/strong\u003e chassis Kia Optima suffer from internal dielectric breakdown. The \u003cstrong\u003eG4JS\u003c\/strong\u003e Sirius II engine houses its two-coil waste-spark system directly atop the hot cylinder head. Over time, engine bay heat soak degrades the internal epoxy resin insulation and thermal potting compound. This breakdown allows high-voltage flashover, winding degradation, and secondary resistance drift. Combined with gradual spark plug ground electrode erosion that widens the spark gap, the weakened factory system triggers rough idle conditions, hesitation under load, decreased fuel economy, and persistent P0300 through P0304 misfire diagnostic trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive ignition service kit is engineered to restore complete flame-front propagation and cold-start ignition reliability. The replacement coils feature high-temperature-rated epoxy potting and precision-wound copper primary and secondary windings designed to resist thermal shock and internal arcing. Paired with pre-gapped, corrosion-resistant spark plugs, this kit stabilizes dielectric resistance and maintains strong spark kernel energy across varying cylinder pressure loads. Designed as a direct plug-and-play match for OEM part \u003cstrong\u003e27301-38020\u003c\/strong\u003e and \u003cstrong\u003eUF285\u003c\/strong\u003e, it restores balanced cylinder pressure without harness modifications.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2005-2006 Kia Optima\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eG4JS (2.4L Sirius II) \/ MS\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e138 hp \/ 147 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eUF285, 27301-38020, 3924, C1226\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2005 Kia Optima LX 2.4L L4 (G4JS)\u003c\/li\u003e\n  \u003cli\u003e2005 Kia Optima EX 2.4L L4 (G4JS)\u003c\/li\u003e\n  \u003cli\u003e2006 Kia Optima LX 2.4L L4 (G4JS, MS Chassis)\u003c\/li\u003e\n  \u003cli\u003e2006 Kia Optima EX 2.4L L4 (G4JS, MS Chassis)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the MS Optima?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2005-2006 Kia Optima equipped with the G4JS 2.4L engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy are there only two ignition coils included for a four-cylinder engine?\u003c\/strong\u003e\u003cbr\u003e The 2.4L Sirius II engine employs a waste-spark ignition configuration, using two coil packs mounted directly over two spark plugs that simultaneously fire the remaining two cylinders via plug wires.\u003c\/p\u003e\n\n\u003ch3\u003eThe Kia Dependability Standard\u003c\/h3\u003e\n\u003cp\u003eMaintain daily-driver reliability and efficient highway cruising. Refreshing aged ignition components ensures reliable cold-weather starting, clean hydrocarbon emissions, and smooth power delivery throughout the entire operating rev range.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50623709708536,"sku":"DS-E29PUWG7U","price":79.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-spark-plugs-for-kia-optima-2005-2006-2-4l-1.jpg?v=1790298559","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-spark-plugs-for-kia-optima-2005-2006-2-4l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}