{"product_id":"ignition-coil-and-iridium-spark-plugs-for-bmw-5-series-1997-2003-4-4l","title":"Ignition Coil and Iridium Spark Plugs for BMW 5 Series (1997-2003) 4.4L","description":"\u003ch2\u003eHigh-Dielectric Ignition Coil and Iridium Spark Plug Kit for 1997-2003 BMW 5 Series\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003ePrimary Function:\u003c\/strong\u003e Restores factory secondary ignition output and precise combustion timing on high-mileage 4.4L V8 engines exhibiting misfires, rough idle, or unburnt hydrocarbon buildup.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock 5 Series Ignition Breakdown\u003c\/h3\u003e\n\u003cp\u003eThe M62 V8 engine bay generates substantial thermal cycles that degrade factory coil-on-plug boots and breakdown internal copper windings over time. This continuous thermal degradation leads to micro-cracking in the epoxy casing, secondary voltage leakages, spark blow-out under load, and carbon tracking on aging spark plug ceramic insulators, triggering persistent DME misfire codes (P0300-P0308).\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive tune-up kit features eight reinforced coil assemblies engineered with high-conductivity copper windings, heat-stabilized thermoplastic housings, and OEM-spec blade terminals for stable millivolt continuity. Matched with fine-wire iridium-tipped spark plugs that require lower firing voltage while resisting high-temperature erosion, this assembly ensures rapid flame kernel propagation, complete combustion, and long-term dielectric reliability.\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;\"\u003e1997-2003 BMW 5 Series (540i)\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;\"\u003eM62B44, M62TUB44 4.4L V8 \/ E39\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;\"\u003e282 hp \/ 324 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;\"\u003eUF354, UF-354, UF300, UF-300\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1997-2003 BMW 540i Sedan 4.4L V8\u003c\/li\u003e\n  \u003cli\u003e1999-2003 BMW 540i Touring Wagon 4.4L V8\u003c\/li\u003e\n  \u003cli\u003e1997-2003 BMW 5 Series 4.4L V8 (E39)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe BMW Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to satisfy stringent European On-Board Diagnostic tolerances, this ignition service package provides zero-fault spark synchronization to protect catalytic converters and eliminate check-engine-light misfire faults.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50458914914552,"sku":"DS-EQE987F0A","price":149.95,"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-bmw-5-series-1997-2003-4-4l-1.jpg?v=1788803399","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-and-iridium-spark-plugs-for-bmw-5-series-1997-2003-4-4l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}