{"product_id":"mercury-ignition-coil-339-883778a01","title":"Mercury – Ignition Coil, 3.0L DFI OptiMax | Ignition System | 8M0077473","description":"\u003cp data-start=\"0\" data-end=\"71\"\u003eMercury – Ignition Coil, 3.0L DFI OptiMax | Ignition System | 8M0077473\u003c\/p\u003e\n\u003chr data-start=\"73\" data-end=\"76\"\u003e\n\u003ch3 data-start=\"78\" data-end=\"92\"\u003eOverview\u003c\/h3\u003e\n\u003cp data-start=\"93\" data-end=\"650\"\u003eAnyone who’s spent time around a 3.0L OptiMax knows they run great when the ignition system is healthy—and not so great when a coil starts to fade. These engines don’t hide it either. You’ll get a shaky idle, a cylinder dropping out as soon as you throttle up, or that mushy, uneven pull that tells you spark isn’t keeping up. This coil is the proper OEM replacement for the 3.0L DFI OptiMax and several Mercury\/Mariner two-stroke setups. It’s built to handle the heat and moisture packed under the cowl, the stuff that usually cooks cheap coils in no time.\u003c\/p\u003e\n\u003chr data-start=\"652\" data-end=\"655\"\u003e\n\u003ch3 data-start=\"657\" data-end=\"675\"\u003eKey Features\u003c\/h3\u003e\n\u003cp data-start=\"676\" data-end=\"1126\"\u003e • \u003cstrong data-start=\"679\" data-end=\"709\"\u003eBuilt for the 3.0L OptiMax\u003c\/strong\u003e – Designed for the DFI ignition system these motors rely on.\u003cbr data-start=\"770\" data-end=\"773\"\u003e • \u003cstrong data-start=\"776\" data-end=\"802\"\u003eStrong, Reliable Spark\u003c\/strong\u003e – Helps clear up misfires, rough running, and weak throttle response.\u003cbr data-start=\"872\" data-end=\"875\"\u003e • \u003cstrong data-start=\"878\" data-end=\"900\"\u003eMarine-Tough Build\u003c\/strong\u003e – Holds up to heat, vibration, salt, and constant moisture.\u003cbr data-start=\"960\" data-end=\"963\"\u003e • \u003cstrong data-start=\"966\" data-end=\"981\"\u003eOEM Fitment\u003c\/strong\u003e – Bolts on without wiring hacks or odd adapters.\u003cbr data-start=\"1030\" data-end=\"1033\"\u003e • \u003cstrong data-start=\"1036\" data-end=\"1059\"\u003eKeeps Timing Steady\u003c\/strong\u003e – Helps fuel and spark stay synced, which these engines depend on.\u003c\/p\u003e\n\u003chr data-start=\"1128\" data-end=\"1131\"\u003e\n\u003ch3 data-start=\"1133\" data-end=\"1166\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/h3\u003e\n\u003cp data-start=\"1167\" data-end=\"1282\"\u003e • Mercury 3.0L DFI OptiMax\u003cbr data-start=\"1194\" data-end=\"1197\"\u003e • Select Mercury\/Mariner V6 two-stroke outboards\u003cbr data-start=\"1246\" data-end=\"1249\"\u003e • DFI and EFI ignition systems\u003c\/p\u003e\n\u003chr data-start=\"1284\" data-end=\"1287\"\u003e\n\u003ch3 data-start=\"1289\" data-end=\"1327\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/h3\u003e\n\u003cp data-start=\"1328\" data-end=\"1659\"\u003eA fresh coil can make a 3.0L feel like itself again. Idle smooths out, the engine stops dropping a cylinder mid-run, and throttle response gets cleaner. OptiMax motors are sensitive—they want a strong, steady spark to keep injection and timing happy. When the coil is right, the whole engine settles in and pulls the way it should.\u003c\/p\u003e\n\u003chr data-start=\"1661\" data-end=\"1664\"\u003e\n\u003ch3 data-start=\"1666\" data-end=\"1683\"\u003eWhy Buy OEM\u003c\/h3\u003e\n\u003cp data-start=\"1684\" data-end=\"1994\"\u003eThese engines live in a hot, damp, vibrating space where cheap coils simply don’t last. OEM coils are wound and sealed for real marine abuse, not just automotive use. They hold up longer, give more consistent spark, and don’t create those annoying intermittent misfires that waste half your weekend diagnosing.\u003c\/p\u003e\n\u003chr data-start=\"1996\" data-end=\"1999\"\u003e\n\u003ch3 data-start=\"2001\" data-end=\"2010\"\u003eFAQ\u003c\/h3\u003e\n\u003cp data-start=\"2011\" data-end=\"2163\"\u003e\u003cstrong data-start=\"2011\" data-end=\"2059\"\u003eQ1: How can I tell a coil is starting to go?\u003c\/strong\u003e\u003cbr data-start=\"2059\" data-end=\"2062\"\u003e\u003cstrong data-start=\"2062\" data-end=\"2068\"\u003eA:\u003c\/strong\u003e Random misfires, rough idle, sluggish hole-shot, or the engine dropping a cylinder under load.\u003c\/p\u003e\n\u003cp data-start=\"2165\" data-end=\"2310\"\u003e\u003cstrong data-start=\"2165\" data-end=\"2214\"\u003eQ2: Should I replace one coil or all of them?\u003c\/strong\u003e\u003cbr data-start=\"2214\" data-end=\"2217\"\u003e\u003cstrong data-start=\"2217\" data-end=\"2223\"\u003eA:\u003c\/strong\u003e If they’re all the same age, many mechanics do them as a set to avoid repeat failures.\u003c\/p\u003e\n\u003cp data-start=\"2312\" data-end=\"2425\"\u003e\u003cstrong data-start=\"2312\" data-end=\"2337\"\u003eQ3: Tough to install?\u003c\/strong\u003e\u003cbr data-start=\"2337\" data-end=\"2340\"\u003e\u003cstrong data-start=\"2340\" data-end=\"2346\"\u003eA:\u003c\/strong\u003e Not really—unplug, unbolt, swap, and reconnect. Just keep the wiring in order.\u003c\/p\u003e\n\u003cp data-start=\"2427\" data-end=\"2547\"\u003e\u003cstrong data-start=\"2427\" data-end=\"2469\"\u003eQ4: Will a new coil help acceleration?\u003c\/strong\u003e\u003cbr data-start=\"2469\" data-end=\"2472\"\u003e\u003cstrong data-start=\"2472\" data-end=\"2478\"\u003eA:\u003c\/strong\u003e Usually. Weak coils show their worst when the engine’s working hard.\u003c\/p\u003e\n\u003cp data-start=\"2549\" data-end=\"2660\"\u003e\u003cstrong data-start=\"2549\" data-end=\"2576\"\u003eQ5: Safe for saltwater?\u003c\/strong\u003e\u003cbr data-start=\"2576\" data-end=\"2579\"\u003e\u003cstrong data-start=\"2579\" data-end=\"2585\"\u003eA:\u003c\/strong\u003e Yes—this coil is sealed for marine use and handles salt and moisture well.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46940470116643,"sku":"339-883778A01","price":151.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV458167_6.jpg?v=1698813068","url":"https:\/\/partsvu.com\/en-ca\/products\/mercury-ignition-coil-339-883778a01","provider":"PartsVu","version":"1.0","type":"link"}