Mercury Idle Air Control Valve (IAC Valve)
$267.89
Genuine Mercury Marine Idle Air Control (IAC) Valve for selected FourStroke EFI outboards from 65HPā150HP. Controls idle airflow to maintain smooth engine operation, reliable starting and stable idle speed. Replaces Mercury part number 897526T.
The Mercury Marine 8M0188118 Idle Air Control Valve (IAC) is a genuine Mercury OEM engine management component designed for selected Mercury FourStroke EFI outboard engines. The valve regulates the amount of air bypassing the throttle plate during idle operation, allowing the engine control module (ECM) to maintain a stable idle speed under varying engine loads and operating conditions.
A properly functioning IAC valve is essential for smooth engine operation, reliable starting and stable idle quality. The valve automatically adjusts airflow during cold starts, shifting, docking manoeuvres and accessory loads to prevent stalling and maintain optimum engine performance.
Common symptoms of a faulty IAC valve include:
- Rough or unstable idle
- Engine stalling at low RPM
- Hard starting
- Surging idle speed
- Poor low-speed operation
- Intermittent engine hesitation
The 8M0188118 valve supersedes Mercury part number 897526T and is used on numerous Mercury FourStroke EFI outboards including selected:
- 65HP EFI Jet
- 75HP EFI
- 80HP EFI
- 90HP EFI
- 100HP EFI
- 115HP EFI
- 115 Pro XS
- 135HP EFI
- 150HP EFI
- 150 Pro XS
- SeaPro EFI models
Engine serial number verification is recommended before ordering.
Manufactured to Mercury Marine specifications, this OEM replacement valve provides precise idle control, improved drivability and long-term reliability in marine environments.
