Idle Air Control Valve IAC For MerCruiser MPI V6 V8 5.0 5.7L 4.3L 862998 18-7701

Idle Air Control Valve IAC for MerCruiser MPI V6 V8 5.0 5.7L 4.3L

This idle air control valve (IAC) regulates engine idle speed for MerCruiser MPI V6 and V8 engines including 4.3L, 5.0L, and 5.7L, replacing OEM part numbers 862998 and 18-7701.

Overview

This idle air control valve IAC is designed for MerCruiser MPI V6 and V8 engines to maintain proper idle speed and smooth operation. It directly replaces OEM units with part numbers 862998 and 18-7701, ensuring a precise fit for your MerCruiser marine engine. The valve modulates airflow to stabilize idle when the throttle is closed, improving engine performance and reducing stalling.

Built For Performance

• Direct OEM replacement for part numbers 862998 and 18-7701
• Precision-machined pintle for accurate airflow control
• Corrosion-resistant materials suited for marine environments
• Sealed electrical connector to prevent moisture ingress
• Rigorously tested for reliable idle stability

Fits These Machines

• for MerCruiser 4.3L MPI V6
• for MerCruiser 5.0L MPI V8
• for MerCruiser 5.7L MPI V8
• for MerCruiser 350 Mag MPI
• for MerCruiser 5.7L Bravo

On-The-Job Use

• Replacing a faulty IAC valve on MerCruiser MPI inboard engines
• Restoring smooth idle after engine warm-up
• Preventing stalling at low RPM during docking or slow-speed maneuvers
• Maintaining consistent idle in variable weather conditions

Specs At A Glance

Good To Know

Q: Does this IAC valve come with a gasket? A: The valve is sold as shown; a new gasket is recommended for installation to ensure a proper seal.

Q: Will this fit my MerCruiser 5.7L MPI with Thunderbolt ignition? A: Yes, this IAC valve is designed for MerCruiser MPI engines regardless of ignition system, but verify your serial number range for compatibility.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.