{"product_id":"ignition-coil-and-iridium-spark-plugs-for-cadillac-sts-2008-2010-4-6l","title":"Ignition Coil and Iridium Spark Plugs for Cadillac STS (2008-2010) 4.6L","description":"\u003ch2\u003eHigh-Output Ignition Coil and Iridium Spark Plug Kit for 2008-2010 Cadillac STS\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Restores factory secondary ignition output and ensures complete combustion efficiency across all eight cylinders on the 4.6L Northstar V8 powertrain.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock STS Coil Degradation and Spark Breakdown\u003c\/h3\u003e\n\u003cp\u003eFactory coil-on-plug modules in the GM Sigma platform are subject to extreme thermal cycling within the tight Northstar cylinder head valley. Over time, engine bay heat soak degrades the internal OEM potting resin, creating micro-fractures in the coil housing. This leads to dielectric breakdown, high-voltage arcing, and intermittent misfires under load (DTC P0300–P0308). Standard worn plugs simultaneously increase electrical resistance, overstressing the primary ignition circuit and degrading fuel economy.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis complete 8-cylinder ignition overhaul kit pairs eight reinforced coil-on-plug assemblies with eight high-grade iridium spark plugs. The ignition coils are engineered with high-purity internal copper windings and thermal-shock-resistant potting compound to prevent voltage leakage under high-load conditions. The fine-wire iridium spark plugs provide a high melting point and lower required firing voltage, promoting rapid flame kernel growth, stable idle dynamics, and crisp throttle response.\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;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2008-2010 Cadillac STS\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e4.6L Northstar LH2 V8 \/ GM Sigma\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e320 hp \/ 315 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eUF564, 89017778, 12594176, D596A, 5C1613, E1064\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2008 Cadillac STS 4.6L V8 (Base, Luxury, Platinum) RWD \/ AWD\u003c\/li\u003e\n  \u003cli\u003e2009 Cadillac STS 4.6L V8 (Base, Luxury, Platinum) RWD \/ AWD\u003c\/li\u003e\n  \u003cli\u003e2010 Cadillac STS 4.6L V8 (Base, Luxury, Platinum) RWD \/ AWD\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Cadillac Luxury Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to meet the precise electrical demands of Cadillac's high-output Northstar V8, this kit eliminates misfire-induced vibrations and prevents check engine lights for seamless executive-class performance.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50448297689336,"sku":"DS-EQLJ4B7Q4","price":135.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-and-iridium-spark-plugs-for-cadillac-sts-2008-2010-4-6l-1.jpg?v=1788639138","url":"https:\/\/performancechiptuning.com\/es\/products\/ignition-coil-and-iridium-spark-plugs-for-cadillac-sts-2008-2010-4-6l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}