{"product_id":"ignition-spark-plugs-and-wires-for-lexus-ls400-1998-2000-4-0l","title":"Ignition Spark Plugs and Wires for Lexus LS400 (1998-2000) 4.0L","description":"\u003ch2\u003eComprehensive Ignition Overhaul Kit for 1998-2000 Lexus LS\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This direct-replacement ignition kit restores combustion efficiency and eliminates misfires by providing a consistent, high-voltage spark to the 4.0L engine.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock LS Ignition Degradation\u003c\/h3\u003e\n\u003cp\u003eOver decades of severe heat cycling, the OEM ignition coils and spark plugs on the 1UZ-FE VVT-i degrade significantly. Factory coil housings are prone to micro-cracking due to constant exposure to extreme engine bay temperatures. This thermal degradation compromises the internal epoxy potting, allowing moisture intrusion and parasitic voltage leaks. Simultaneously, high-mileage spark plugs suffer from center electrode wear, increasing the resistance gap. This mechanical combination causes primary and secondary circuit failures, resulting in rough idling, hesitation under heavy load, and inevitable P0300-series misfire diagnostic trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive ignition overhaul directly addresses thermal breakdown and spark blowout. The Aero ignition coils utilize high-grade dielectric epoxy and reinforced polymer housings to withstand intense thermal shock and prevent casing fractures. High-conductivity copper primary windings ensure rapid magnetic saturation, delivering maximum secondary voltage output. Paired with NGK Iridium spark plugs, which feature an ultra-fine center electrode and superior heat dissipation characteristics, the system ensures a highly concentrated spark. The durable iridium construction maintains exact gap tolerances over a drastically extended service interval. This synchronized hardware restores precise ignition timing, smooths out power delivery, and optimizes fuel atomization.\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;\"\u003e1998-2000 Lexus LS\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;\"\u003e1UZ-FE VVT-i \/ UCF20\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;\"\u003e290 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;\"\u003eIC78053176087810275608\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1998 Lexus LS400 4.0L V8\u003c\/li\u003e\n  \u003cli\u003e1999 Lexus LS400 4.0L V8\u003c\/li\u003e\n  \u003cli\u003e2000 Lexus LS400 4.0L V8\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Lexus Precision Standard\u003c\/h3\u003e\n\u003cp\u003eFor a flagship JDM luxury sedan revered for its ultra-smooth V8, maintaining precise combustion is critical. This OEM-grade replacement restores the factory-smooth idle and effortless power delivery expected from the UCF20 chassis, keeping the legendary 1UZ running flawlessly without triggering check engine lights.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":48901149786360,"sku":"DS-EWJ0KR78R","price":229.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-spark-plugs-and-wires-for-lexus-ls400-1998-2000-4-0l-1.webp?v=1781210813","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-spark-plugs-and-wires-for-lexus-ls400-1998-2000-4-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}