{"product_id":"ignition-coil-and-iridium-spark-plugs-for-pontiac-bonneville-2004-2005-4-6l","title":"Ignition Coil and Iridium Spark Plugs for Pontiac Bonneville (2004-2005) 4.6L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Kit for 2004-2005 Pontiac Bonneville\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eDirect-Fit Ignition Refresh:\u003c\/strong\u003e Restores factory secondary voltage delivery and complete cylinder combustion across all cylinders to resolve misfires, hesitation, and rough idle under load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Bonneville Thermal Breakdown and Misfire Issues\u003c\/h3\u003e\n\u003cp\u003eIn the tightly packed transverse engine bay of the Northstar V8, OEM ignition coils and aging spark plugs endure extreme thermal cycling. Over mileage, internal coil epoxy insulation breaks down, creating micro-arcing and secondary winding resistance drift. When paired with worn spark plug electrodes that have widened gaps, the ignition system requires excessive voltage to bridge the gap, leading to P0300 multi-cylinder misfires, loss of high-RPM power, unburned fuel washdown, and catalytic converter damage.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis complete ignition overhaul package features 8 heavy-duty coil-on-plug assemblies equipped with high-conductivity internal copper windings, durable dielectric housing, and direct-fit blade terminal connectors to prevent voltage leakage. Paired with 8 fine-wire iridium spark plugs, the kit reduces the required arc voltage while resisting thermal erosion. The result is instant cold-start ignition, consistent flame-front propagation, smooth idle stability, and restored full-throttle power output across the entire rev range.\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;\"\u003e2004-2005 Pontiac Bonneville\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 V8 (LD8) \/ GM G-Body\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;\"\u003e275 hp \/ 300 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, 12594176, 89017778, ITR4A15, 0997000940, D596A, 5C1613\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2004 Pontiac Bonneville GXP 4.6L V8 (LD8)\u003c\/li\u003e\n  \u003cli\u003e2005 Pontiac Bonneville GXP 4.6L V8 (LD8)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Pontiac V8 Performance Standard\u003c\/h3\u003e\n\u003cp\u003eDesigned specifically to handle the thermal demands and high-compression combustion characteristics of the Northstar V8, this kit ensures dependable throttle response and optimal power delivery without spark blowout.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50451866910968,"sku":"DS-EKVJKLM4K","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-pontiac-bonneville-2004-2005-4-6l-1.jpg?v=1788711826","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-and-iridium-spark-plugs-for-pontiac-bonneville-2004-2005-4-6l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}