{"product_id":"devmo-idle-air-control-valve-for-mercruiser-ecm-555-direct-replacement-for-oe-18-7701-862998-iron-construction","title":"DEVMO Idle Air Control Valve for MerCruiser ECM 555 — Direct Replacement for OE 18-7701 \/ 862998, Iron Construction","description":"\u003cstrong\u003eDEVMO's idle air control valve is a direct-fit replacement for MerCruiser OE# 18-7701 \/ 862998 designed to restore stable idle and reliable airflow control on compatible MerCruiser engines with ECM 555 (2001 and newer).\u003c\/strong\u003e\n\n\u003cp\u003eIf your boat has rough idling, surging at low throttle, or erratic RPM behavior, a worn idle air control (IAC) valve is a common culprit. This DEVMO unit is built from abrasion- and impact-resistant iron for long life and consistent performance. It is supplied as a single, ready-to-install valve compatible with a wide range of MerCruiser V6 and V8 applications that use ECM 555, covering many 4.3L through 8.2L models.\u003c\/p\u003e\n\n\u003ch3\u003eWhich engines and serial ranges is this IAC valve compatible with?\u003c\/h3\u003e\n\u003cp\u003eThis replacement fits MerCruiser V6 and V8 engines that use ECM 555 from model year 2001 onward. The listing matches MerCruiser OE part numbers and Sierra cross-reference to ensure a correct fit—check your engine serial number and model to confirm compatibility before ordering.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with 3.0L MPI, 4.3L MPI, 5.0L, 5.7L, 6.2L, 8.1L and related MPI\/MIE V6\/V8 variants\u003c\/li\u003e\n  \u003cli\u003eFits serial ranges shown in the product compatibility list (e.g., 0M300000 \u0026amp; up, 1A090000 \u0026amp; up)\u003c\/li\u003e\n  \u003cli\u003eDirect replacement for MerCruiser #862998 and Sierra #18-7701\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this IAC valve help how my boat idles?\u003c\/h3\u003e\n\u003cp\u003eThe IAC valve controls bypass airflow around the throttle plate at idle so the engine maintains a steady RPM when accessories or load changes occur. Replacing a failing IAC restores predictable idle behavior and reduces frequent stalls, hunting, or RPM spikes during idle or warm-up.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRegulates idle airflow to stabilize RPM under varying loads\u003c\/li\u003e\n  \u003cli\u003eReduces stalling, rough idle, and unwanted surging\u003c\/li\u003e\n  \u003cli\u003eImproves responsiveness during engine warm-up and accessory use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIs this DEVMO unit easy to install and what should I prepare?\u003c\/h3\u003e\n\u003cp\u003eThe DEVMO valve is supplied as a single unit designed for direct replacement of the specified OE numbers, which keeps installation straightforward for a mechanically skilled technician. Basic tools and a safe, well-ventilated workspace are required; depending on model, access may require removal of engine covers or intake components.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSimple bolt-on replacement for OE# 862998 \/ Sierra 18-7701\u003c\/li\u003e\n  \u003cli\u003eRequires standard hand tools and possibly basic hose or cover removal\u003c\/li\u003e\n  \u003cli\u003eRecommended: professional installation or guidance from a qualified mechanic\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and durability features does this valve offer?\u003c\/h3\u003e\n\u003cp\u003eConstructed from robust iron, this IAC valve resists abrasion and impact, helping it withstand marine operating conditions. The material choice and manufacturing tolerances aim to provide consistent operation and long-term stability under normal boating use.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAbrasion- and impact-resistant iron construction\u003c\/li\u003e\n  \u003cli\u003eEngineered for stable performance and longevity\u003c\/li\u003e\n  \u003cli\u003eSupplied as one complete replacement unit in the package\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this product for: boat owners, fleet managers, and marine technicians who operate or service MerCruiser-equipped vessels with ECM 555 and are experiencing idle stability issues. If you need a direct OE-replacement idle air control valve for 3.0L through 8.2L MerCruiser MPI\/MIE engines (see full compatibility list), DEVMO’s part offers a durable, ready-to-install option. For safe and correct installation, we recommend having the swap performed or inspected by a qualified marine mechanic; contact our support team if you have questions about fitment or installation.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this fit my MerCruiser with ECM 555?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Likely—this DEVMO valve fits many MerCruiser V6\/V8 engines using ECM 555 (2001+). Check your engine model and serial range against the compatibility list first.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I install this myself?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: If you have mechanical experience, installation is straightforward, but we recommend a professional mechanic for proper access and calibration.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"DEVMO","offers":[{"title":"Default Title","offer_id":55168336626007,"sku":"B09TK3KG7Z","price":50.72,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/devmo-iac-front-assembly.jpg?v=1790400800","url":"https:\/\/britishgarage.co.uk\/products\/devmo-idle-air-control-valve-for-mercruiser-ecm-555-direct-replacement-for-oe-18-7701-862998-iron-construction","provider":"British Garage","version":"1.0","type":"link"}