{"product_id":"ignition-coil-and-iridium-spark-plugs-for-bmw-5-series-1991-1995-2-5l","title":"Ignition Coil and Iridium Spark Plugs for BMW 5 Series (1991-1995) 2.5L","description":"\u003ch2\u003eDirect-Fit Ignition Coil and Iridium Spark Plug Kit for 1991-1995 BMW 5 Series\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Ignition Coil and Iridium Spark Plug Kit replaces degraded factory coils and worn plugs on the 1991-1995 BMW 5 Series to restore stable secondary voltage, eliminate misfires, and maximize combustion efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock BMW 5 Series Thermal Fatigue and Voltage Leakage\u003c\/h3\u003e\n\u003cp\u003eThe original ignition coils on the \u003cstrong\u003eE34\u003c\/strong\u003e platform equipped with the \u003cstrong\u003eM50B25\u003c\/strong\u003e inline-six frequently suffer from dielectric breakdown caused by decades of engine bay heat cycles. Factory epoxy and rubber insulating boots harden over time, forming micro-cracks that leak secondary voltage to the cylinder head rather than the plug gap. Coupled with standard copper plugs that widen their gap under normal erosion, the ignition system experiences increased primary winding resistance, rough cold idle, and spark blowout under load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis refresh package pairs direct-fit coil-on-plug units with fine-wire iridium spark plugs designed specifically for the thermal demands of BMW's multi-valve cylinder head. The replacement ignition coils feature heavy-duty copper primary and secondary windings encapsulated in heat-resistant potting compound, shielded by silicone boots that withstand continuous temperatures up to 200°C. The iridium plugs utilize a laser-welded 0.6mm center electrode, requiring significantly less firing voltage to project a robust, stable flame kernel into the combustion chamber for clean fuel atomization and sharp throttle response.\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;\"\u003e1991-1995 BMW 5 Series (525i, 525iT)\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\u003eM50B25\u003c\/strong\u003e \/ \u003cstrong\u003eE34\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;\"\u003e189 hp \/ 181 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\u003e12139066468\u003c\/strong\u003e, \u003cstrong\u003eUF226\u003c\/strong\u003e, \u003cstrong\u003e1703359\u003c\/strong\u003e, \u003cstrong\u003e19017143\u003c\/strong\u003e, \u003cstrong\u003e00083\u003c\/strong\u003e, \u003cstrong\u003e12131703359\u003c\/strong\u003e, \u003cstrong\u003e12131726177\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\u003e1991-1995 BMW 525i Base Sedan 2.5L L6 Gas\u003c\/li\u003e\n  \u003cli\u003e1992-1995 BMW 525iT Base Wagon 2.5L L6 Gas\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the E34 5 Series?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 1991-1995 BMW 5 Series equipped with the \u003cstrong\u003eM50B25\u003c\/strong\u003e engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre the iridium spark plugs pre-gapped for the M50 engine?\u003c\/strong\u003e\u003cbr\u003e Yes, the plugs are factory-calibrated to BMW specifications, though checking gap clearance prior to installation remains standard procedure.\u003c\/p\u003e\n\n\u003ch3\u003eThe BMW Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEuropean inline-six engines require clean, uniform spark timing across all cylinders to prevent DME fault triggers and maintain smooth power delivery. This matched coil-and-plug kit restores factory ignition calibration to maintain a balanced idle and reliable combustion without throwing CEL faults.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50593984020728,"sku":"DS-E4Q0UH67M","price":118.95,"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-1991-1995-2-5l-1.jpg?v=1790055083","url":"https:\/\/performancechiptuning.com\/fr\/products\/ignition-coil-and-iridium-spark-plugs-for-bmw-5-series-1991-1995-2-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}