{"product_id":"ignition-coil-iridium-spark-plugs-for-mazda-mx-5-miata-1999-2000-1-8l","title":"Ignition Coil + Iridium Spark Plugs for Mazda MX-5 Miata (1999-2000) 1.8L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Replacement Ignition Coil and Iridium Spark Plug Kit for 1999-2000 Mazda MX-5 Miata (NB)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The ignition coil and iridium spark plug kit restores primary and secondary ignition energy on the 1999-2000 Mazda MX-5 Miata to eliminate high-RPM spark blowout and resolve rough idle conditions caused by secondary circuit breakdown.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Mazda MX-5 Miata Ignition Degradation\u003c\/h3\u003e\n\u003cp\u003eFactory waste-spark coil assemblies on the second-generation \u003cstrong\u003eNB\u003c\/strong\u003e Miata are mounted at the rear of the cylinder head, directly against the firewall. In this high-temperature zone, sustained thermal cycling degrades the coil's internal epoxy potting and fine primary copper windings. This leads to dielectric failure, intermittent secondary voltage leakage, and unmetered misfires under heavy engine load. Paired with aged spark plugs whose widened gaps demand higher ionization voltage than tired stock coils can deliver, the \u003cstrong\u003eBP-4W\u003c\/strong\u003e engine suffers from sluggish throttle response, unburnt hydrocarbons, and power drop-off near the 7,000 RPM fuel cut.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis ignition service pack features a direct-fit dual waste-spark coil pack engineered to match factory dwell timing and discharge profiles, replacing OEM numbers like \u003cstrong\u003eBP4W1810XB\u003c\/strong\u003e and \u003cstrong\u003eUF343\u003c\/strong\u003e. High-dielectric epoxy resists thermal fatigue, preventing casing fractures and voltage arcing. Paired with fine-wire iridium spark plugs, the setup requires significantly lower firing voltage to initiate flame-front propagation. The small-diameter iridium center electrode ensures stable spark kernel development under varying cylinder pressures, restoring crisp transient throttle response and complete combustion efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\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;\"\u003e1999-2000 Mazda MX-5 Miata\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;\"\u003eBP-4W 1.8L \/ NB\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;\"\u003e140 hp \/ 119 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;\"\u003eBP4W1810XB, BP4W1810XA, BP4W1810X, UF343\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1999 Mazda MX-5 Miata Base 1.8L L4 Gas (NB)\u003c\/li\u003e\n  \u003cli\u003e1999 Mazda MX-5 Miata 10th Anniversary 1.8L L4 Gas (NB)\u003c\/li\u003e\n  \u003cli\u003e2000 Mazda MX-5 Miata Base 1.8L L4 Gas (NB)\u003c\/li\u003e\n  \u003cli\u003e2000 Mazda MX-5 Miata LS 1.8L L4 Gas (NB)\u003c\/li\u003e\n  \u003cli\u003e2000 Mazda MX-5 Miata Special Edition 1.8L L4 Gas (NB)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the NB MX-5 Miata?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 1999-2000 Mazda MX-5 Miata equipped with the 1.8L \u003cstrong\u003eBP-4W\u003c\/strong\u003e engine.\u003c\/p\u003e\n\n\u003ch4\u003eAre spark plug wires included with this kit?\u003c\/h4\u003e\n\u003cp\u003eNo, this replacement service package includes one waste-spark coil assembly and four iridium spark plugs; plug wires are sold separately.\u003c\/p\u003e\n\n\u003ch3\u003eThe Mazda Roadster Standard\u003c\/h3\u003e\n\u003cp\u003eHigh-revving naturally aspirated JDM engines demand clean, uninterrupted spark to preserve throttle precision and balanced power delivery throughout the rev range.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67524645748984,"sku":"DS-EO0R9LS58","price":86.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-iridium-spark-plugs-for-mazda-mx-5-miata-1999-2000-1-8l-1.jpg?v=1790461349","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-iridium-spark-plugs-for-mazda-mx-5-miata-1999-2000-1-8l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}