Standard Ignition AC592 Idle Air Control Valve

Idle Control for Land Rover V8 Applications

Standard Ignition AC592 is an idle air control valve for Land Rover throttle-body fuel injection systems. It is built with an oval connector shape, a single port, and a 4-terminal electrical connection for direct replacement service on supported Range Rover, Discovery, and Defender 90 applications.

This Standard Ignition AC592 idle air control valve fits 1996-2002 Land Rover Range Rover, 1996-1998 Land Rover Discovery, and 1997 Land Rover Defender 90. It mounts on the throttle body on the 2002 Range Rover application and includes a gasket for installation.

Key Features

• Idle air control valve for fuel injection system service
• Oval connector shape with 4 terminals
• Single-port design
• Gaskets included
• Direct-fit replacement for supported Land Rover applications
• Standard Ignition AC592 part number for catalog matching

Detailed Description

Standard Ignition AC592 is an idle air control valve used to regulate bypass air at the throttle body so the engine can maintain a stable idle under changing load conditions. The oval connector, 4-terminal layout, and 1-port configuration match the listed Land Rover applications, making it a practical replacement for idle control service on Range Rover, Discovery, and Defender 90 models. This part cross-references Remy 25021 for the same application.

Common Symptoms Addressed

• Unstable or fluctuating idle speed
• Stalling when coming to a stop
• High idle after startup
• Idle speed changes when accessories are switched on
• Throttle body idle control faults on Land Rover Range Rover and Discovery models

Installation Notes

Verify connector shape, terminal count, and throttle body mounting location before installation. Clean the throttle body and mating surfaces before fitting the new valve and gasket. Confirm the electrical connector seats fully and check for vacuum leaks or carbon buildup that can affect idle quality. Fits 2002 Land Rover Range Rover, N/A; Fits 1996-2002 Land Rover Range Rover, N/A; Fits 1996-2001 Land Rover Range Rover, N/A; Fits 1996-1998 Land Rover Discovery, N/A; Fits 1997 Land Rover Defender 90, N/A.

Quality Assurance

Standard Ignition is a recognized aftermarket brand for engine management and fuel delivery components. AC592 is cataloged as an idle air control valve with application-specific fitment data for Land Rover Range Rover, Discovery, and Defender 90 models.