{"product_id":"arco-ig001-mercruiser-ignition-sensor-57-ig001","title":"Arco IG001 Ignition Sensor — MerCruiser Thunderbolt IV \u0026 V GM V6 \/ V8","description":"\u003ch2\u003eOEM-Grade Ignition Sensor for MerCruiser Thunderbolt IV \u0026amp; V Systems\u003c\/h2\u003e\u003cp\u003eThe Arco IG001 is a direct-fit replacement ignition sensor (trigger module) engineered for MerCruiser GM V6 and V8 inboard and sterndrive engines equipped with Thunderbolt IV or Thunderbolt V ignition systems. This sensor controls spark timing signals within the distributor and is a critical component for reliable engine starting and smooth operation.\u003c\/p\u003e\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser GM V6 engines — Thunderbolt IV ignition\u003c\/li\u003e\n\u003cli\u003eMerCruiser GM V6 engines — Thunderbolt V ignition\u003c\/li\u003e\n\u003cli\u003eMerCruiser GM V8 engines — Thunderbolt IV ignition\u003c\/li\u003e\n\u003cli\u003eMerCruiser GM V8 engines — Thunderbolt V ignition\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces OEM Part Numbers\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser: 87-892150Q02, 892150A02, 861780A2, 91019A6, 861780Q4, 861780A4, 91019A3, 91019A2\u003c\/li\u003e\n\u003cli\u003eSierra: 18-5116-1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eThe IG001 is the right part when a Thunderbolt IV or V engine cranks but won’t fire, or exhibits intermittent no-spark conditions — classic signs of a failed ignition sensor. It’s one of the more common failure points on aging Thunderbolt systems and is often overlooked during basic tune-ups. When replacing the sensor, it’s good practice to service the full distributor at the same time — pair with the \u003ca href=\"\/products\/arco-dr004-mercruiser-rotor-57-dr004\"\u003eArco DR004 Distributor Rotor\u003c\/a\u003e for a complete Thunderbolt ignition refresh. If you’re unsure which sensor fits your engine, compare with the \u003ca href=\"\/products\/arco-ig005-mercruiser-ignition-sensor\"\u003eArco IG005 Ignition Sensor\u003c\/a\u003e, which covers a different Thunderbolt application range.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51250812256292,"sku":"57-IG001","price":153.29,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/57-IG001.jpg?v=1786510583","url":"https:\/\/marisolmarine.com\/products\/arco-ig001-mercruiser-ignition-sensor-57-ig001","provider":"Marisol Marine Company","version":"1.0","type":"link"}