{"product_id":"ignition-coil-and-iridium-spark-plugs-for-ford-thunderbird-2002-2005-3-9l","title":"Ignition Coil and Iridium Spark Plugs for Ford Thunderbird (2002-2005) 3.9L","description":"\u003ch2\u003eDirect-Fit Ignition Service Kit for 2002-2005 Ford Thunderbird\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eDirect Replacement Ignition Kit:\u003c\/strong\u003e Restores factory secondary ignition output, stabilizes idle harmonics, and eliminates cylinder misfires on the 3.9L DOHC V8 engine.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Thunderbird Ignition Breakdown\u003c\/h3\u003e\n\u003cp\u003eThe AJ35 V8 in the DEW98 platform suffers from high underhood thermal cycling and oil-vapor intrusion inside the deep cylinder-head spark plug wells. Over time, OEM coil boots degrade, causing secondary dielectric punch-through, spark scatter, and degraded copper winding resistance. This results in hesitation under load, erratic idle, and typical P0300–P0308 misfire diagnostic trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive kit delivers eight direct-fit coil-on-plug units paired with eight fine-wire iridium spark plugs. The ignition coils feature reinforced thermoplastic housings, high-temperature epoxy potting, and oxygen-free copper secondary windings for maximum inductive energy transfer. Paired with corrosion-resistant iridium electrodes that require lower strike voltages, this assembly resists thermal fatigue and maintains reliable arc stability across all RPM ranges.\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;\"\u003e2002-2005 Ford Thunderbird\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;\"\u003e3.9L AJ35 V8 \/ DEW98\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;\"\u003e252-280 hp \/ 267-286 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;\"\u003eDG529 \/ DG-529\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2002 Ford Thunderbird Base 3.9L V8 - Gas\u003c\/li\u003e\n  \u003cli\u003e2003 Ford Thunderbird Base 3.9L V8 - Gas\u003c\/li\u003e\n  \u003cli\u003e2004 Ford Thunderbird Base, Pacific Coast Roadster 3.9L V8 - Gas\u003c\/li\u003e\n  \u003cli\u003e2005 Ford Thunderbird Base, 50th Anniversary Edition 3.9L V8 - Gas\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Ford V8 Reliability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to meet rigorous tolerance thresholds, this ignition kit restores the smooth, responsive power delivery expected from Ford's modern classic roadster while protecting catalytic converters from unburnt fuel wash.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50452208189688,"sku":"DS-EK55XIZUJ","price":115.95,"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-ford-thunderbird-2002-2005-3-9l-1.jpg?v=1788720819","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-and-iridium-spark-plugs-for-ford-thunderbird-2002-2005-3-9l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}