Standard Ignition AC387 Idle Air Control Valve

Idle Air Control Valve for BMW 325i and 525i

Standard Ignition AC387 is an idle air control valve for select BMW applications from 1989-1993. It is built with a female connector, one connector cavity, two hose connections, and a 3-terminal blade interface to match the original-style electrical and vacuum routing on the vehicle.

For BMW 325i, 325is, 325iX, and 525i models, this AC387 idle air control valve supports stable idle control when the engine is at rest or under changing load conditions. The part number AC387 is also a useful reference when verifying replacement needs against OE-style interchange listings.

Key Features

• Idle Air Control Valve for select BMW fuel injection systems
• Female connector with 1 connector opening
• 2 hose connectors for factory-style air routing
• 3-terminal blade electrical interface with male terminals
• Direct-fit replacement reference for Standard Ignition AC387
• Cross-reference part numbers include 2-19488 and 13411433626 for the same application

Detailed Description

Standard Ignition AC387 is an idle air control valve used in air and fuel delivery systems to regulate bypass air around the throttle body. On 1989-1993 BMW 325i and 325is, plus 1989-1991 BMW 325iX and 1989-1992 BMW 525i applications, this component helps maintain the commanded idle speed as engine load changes from accessories, warm-up, or throttle closure. If you are searching for an idle air control valve for BMW 325i, BMW 325is, BMW 325iX, or BMW 525i, AC387 is a direct part-number match to verify against your original unit.

What It Helps Address

• Unstable or fluctuating idle speed
• Engine stalling when coming to a stop
• Idle speed that is too high or too low
• Idle quality changes when accessories are switched on
• Air bypass control issues in the fuel injection system

Installation Notes and Tips

Confirm connector style, hose connection layout, and terminal count before installation. Compare the original valve to AC387 and verify the BMW model year range against the vehicle application list. Clean surrounding intake and throttle-body areas during replacement to help prevent debris from entering the air bypass passage. After installation, check for vacuum leaks and verify idle behavior at operating temperature.

Quality Assurance

Standard Ignition supplies replacement ignition and engine management components for service applications, and AC387 is listed with OE-style interchange references for application verification. Use the part number AC387 and the vehicle fitment details to confirm the correct idle air control valve for your BMW.