Tutor Auto Idle Air Control Valve for MerCruiser V6/V8 ECM 555 (2001+) — Direct Fit with Gasket, OEM-Style

Tutor Auto's Idle Air Control Valve (IAC) replaces MerCruiser 862998 and Sierra 18-7701 to restore steady idle and reliable warm-up on V6 and V8 MerCruiser engines (ECM 555, 2001+), and includes a gasket for direct fit installation.

When idle instability, rough cold starts, or surging affect a MerCruiser-equipped boat, the idle air control valve is often the component that needs replacement. This Tutor Auto IAC is built to the same mounting and electrical specifications as the factory unit and is compatible with many 4.3L through 8.2L MerCruiser engines using ECM 555. It ships with a new gasket and undergoes inspection before packaging so you receive a ready-to-install part that aims to bring idle behavior back to normal without the wait for a dealer order.

How does this IAC help my engine start and idle more smoothly?

The IAC meters bypass air around the throttle when the throttle plate is closed so the engine maintains a consistent idle. By allowing controlled extra air during cold starts and at low rpm, it shortens warm-up time and prevents erratic idling or stalling.

• Delivers regulated bypass air for stable idle speed
• Improves cold-start warm-up behavior
• Reduces surging and rough-idle symptoms

Which MerCruiser engines and part numbers does this replace?

This Tutor Auto IAC is compatible with MerCruiser V6 and V8 engines that use ECM 555 from 2001 onward. It is designed as a direct replacement for Mercury Marine part 862998 and Sierra part 18-7701 for a straightforward swap.

• Fits 4.3L Alpha/Bravo, 5.0L, 5.7L, 350 MAG and related EFI models
• Compatible with 454 MAG MPI, 502 MAG MPI, 7.4L and 8.1/8.2L MPI variants
• Intended for ECM 555-equipped MerCruiser engines (2001+)

Is this an OEM part and how difficult is installation?

While not an original Mercury Marine unit, the valve is manufactured to match OEM dimensions and electrical connectors so it installs like the factory part. Basic mechanical ability and common hand tools are typically all that are needed for a direct-fit replacement.

• OEM-style mounting and connector alignment for plug-and-play fit
• Includes a new gasket to ensure a proper seal during installation
• No special programming is usually required for ECM 555 systems

What quality checks and warranty coverage come with the product?

Tutor Auto inspects units during production and again before shipping to help ensure reliability out of the box. The part is constructed from durable iron for abrasion and impact resistance and is backed by a 12-month warranty covering replacement or refund if you're not satisfied.

• Hand-inspected parts before packing and shipment
• Robust iron construction for long service life
• 12-month warranty with replacement or refund options

Who is this for: Boat owners, marine technicians, and do-it-yourselfers who operate MerCruiser V6 or V8 engines with ECM 555 (2001 and newer) and are experiencing idle irregularities or cold-start issues. Choose this Tutor Auto IAC if you want a direct-fit replacement that comes with the gasket, is built to resist wear, and includes a one-year warranty so you can return to reliable idling quickly.