{"product_id":"ignition-coil-and-iridium-spark-plugs-for-volvo-s90-1997-1998-2-9l","title":"Ignition Coil and Iridium Spark Plugs for Volvo S90 (1997-1998) 2.9L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Kit for 1997-1998 Volvo S90\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The ignition coil and iridium spark plug kit restores primary combustion efficiency, stabilizes idle, and eliminates secondary ignition misfires on the 1997-1998 Volvo S90.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Volvo S90 Thermal Breakdown and Voltage Leakage\u003c\/h3\u003e\n\u003cp\u003eThe naturally aspirated \u003cstrong\u003eB6304S\u003c\/strong\u003e 2.9L inline-six relies on an individual coil-on-plug architecture positioned beneath a plastic spark plug vanity cover. Over decades of heat cycling, this recessed layout traps severe cylinder-head heat, causing the factory epoxy encapsulation and silicone plug boots to degrade. Dielectric breakdown follows, resulting in micro-arcing against the magnesium cam cover, unburnt fuel wash, intermittent rough idle, and persistent P0300-P0306 misfire codes under load. Concurrently, standard nickel-core plugs erode prematurely, widening the electrode gap and overworking aging primary coils.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive overhaul kit features six high-dielectric pencil ignition coils matched with fine-wire iridium spark plugs to permanently resolve high-temperature ignition failure. Each coil housing utilizes reinforced, high-temperature thermoplastic PBT with high-grade copper windings to maintain peak magnetic saturation and constant secondary kilovolt output across the entire rev range. The companion iridium plugs feature a laser-welded 0.6mm ultra-fine center electrode that drastically lowers the required striking voltage while resisting thermal quenching. Paired with high-tear silicone dielectric boots, this kit restores crisp throttle tip-in, uniform flame front propagation, and reliable cold-start combustion.\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; margin-bottom: 20px;\"\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;\"\u003e1997-1998 Volvo S90\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;\"\u003e\n\u003cstrong\u003eB6304S\u003c\/strong\u003e 2.9L DOHC I6 \/ \u003cstrong\u003e964 Chassis\u003c\/strong\u003e\n\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;\"\u003e181 hp \/ 199 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;\"\u003e\n\u003cstrong\u003e35313006\u003c\/strong\u003e, \u003cstrong\u003eUF167\u003c\/strong\u003e, \u003cstrong\u003e9135689\u003c\/strong\u003e, \u003cstrong\u003e91356899\u003c\/strong\u003e, \u003cstrong\u003e9146776\u003c\/strong\u003e, \u003cstrong\u003e1275971\u003c\/strong\u003e, \u003cstrong\u003e12759710\u003c\/strong\u003e, \u003cstrong\u003e12759718\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1997 Volvo S90 Base Sedan 2.9L L6 (B6304S)\u003c\/li\u003e\n  \u003cli\u003e1998 Volvo S90 Base Sedan 2.9L L6 (B6304S)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the 964 Chassis S90?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 1997-1998 Volvo S90 equipped with the \u003cstrong\u003eB6304S\u003c\/strong\u003e engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre the iridium spark plugs pre-gapped for the B6304S inline-six?\u003c\/strong\u003e\u003cbr\u003e Plugs arrive pre-gapped to factory specifications; always confirm gap using a feeler gauge prior to torquing to avoid electrode damage.\u003c\/p\u003e\n\n\u003ch3\u003eThe Volvo European Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to exact Motronic system impedance parameters, this complete secondary ignition assembly preserves factory European diagnostic compliance and delivers zero-CEL, OE-level ignition timing consistency.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50593940144376,"sku":"DS-ECSMUIHXU","price":109.95,"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-volvo-s90-1997-1998-2-9l-1.jpg?v=1790054391","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-and-iridium-spark-plugs-for-volvo-s90-1997-1998-2-9l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}