{"product_id":"ignition-coil-iridium-spark-plugs-for-mercedes-benz-gle-class-gls-class-2017-4-7l-5-5l","title":"Ignition Coil + Iridium Spark Plugs for Mercedes Benz GLE-Class GLS-Class (2017) 4.7L 5.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Ignition Coil \u0026amp; Iridium Spark Plug Service Kit for Mercedes Benz GLE-Class, GLS-Class 4.7L, 5.5L (W166\/X166 M278\/M157)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The ignition coil and spark plug kit replaces aged ignition components on the Mercedes-Benz GLE-Class and GLS-Class to restore spark energy, prevent high-load misfires, and ensure clean combustion.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Mercedes Benz GLE-Class, GLS-Class Ignition Degradation Under Boost\u003c\/h3\u003e\n\u003cp\u003eIn high-output twin-turbocharged platforms like the \u003cstrong\u003eM278\u003c\/strong\u003e and \u003cstrong\u003eM157\u003c\/strong\u003e, elevated under-hood thermal cycles and cylinder pressures tax the primary and secondary ignition circuits. Over time, factory coil boots harden and crack, causing secondary voltage flashover against the spark plug wells. Concurrently, factory spark plugs experience accelerated center electrode gap widening due to sustained boost, forcing the coils to work beyond their designed insulation limits. This leads to hesitations under wide-open throttle, idle instability, reduced fuel efficiency, and P0300 through P0308 misfire codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive ignition service kit restores factory dwell efficiency and spark delivery. Engineered as a direct drop-in replacement for OEM reference \u003cstrong\u003eA2769063700\u003c\/strong\u003e and \u003cstrong\u003eUF741\u003c\/strong\u003e, each coil features reinforced copper windings sealed in high-dielectric epoxy to resist heat soak and internal shorting. Paired with \u003cstrong\u003eBosch ZR6SII3320\u003c\/strong\u003e double iridium spark plugs, the laser-welded fine-wire center electrode design lowers the required firing voltage, maintains stable electrode gaps under 20+ psi of boost, and maximizes flame front kernel expansion for total combustion stability.\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: solid font-size: min-width:\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;\"\u003eMercedes Benz GLE-Class, GLS-Class\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;\"\u003eM278, M157 \/ W166, X166\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;\"\u003e449–577 hp \/ 516–561 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;\"\u003eUF741, A2769063700, 2769063700, 2769060501, 0040103070, ZR6SII3320\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\u003e2017 Mercedes Benz GLE-Class GLE63 AMG 5.5L V8 Biturbo (M157)\u003c\/li\u003e\n  \u003cli\u003e2017 Mercedes Benz GLS-Class GLS550 4.7L V8 Biturbo (M278)\u003c\/li\u003e\n  \u003cli\u003e2017 Mercedes Benz GLS-Class GLS63 AMG 5.5L V8 Biturbo (M157)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the W166 \/ X166 GLE-Class, GLS-Class?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the Mercedes Benz GLE-Class and GLS-Class equipped with the M278 4.7L or M157 5.5L Biturbo engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is the proper spark plug installation torque?\u003c\/strong\u003e\u003cbr\u003e Torque these M12 threaded plugs dry to the factory specification of 23 Nm (17 lb-ft); do not apply anti-seize compound.\u003c\/p\u003e\n\n\u003ch3\u003eThe Mercedes Benz Precision Standard\u003c\/h3\u003e\n\u003cp\u003eHigh-performance European biturbo powertrains require exact electrical resistance and timing tolerances to prevent ECU torque-intervention and diagnostic faults. This direct-fit kit meets rigid German OE specifications, ensuring clean combustion and factory drivability with zero check engine lights.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50625860141304,"sku":"DS-ETVYFTD46","price":499.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/ignition-coil-iridium-spark-plugs-for-mercedes-benz-gle-class-gls-class-2017-4-7l-5-5l-1.jpg?v=1790352497","url":"https:\/\/performancechiptuning.com\/products\/ignition-coil-iridium-spark-plugs-for-mercedes-benz-gle-class-gls-class-2017-4-7l-5-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}