Standard Ignition AC399 Idle Air Control Valve

Overview of Standard Ignition AC399 Idle Air Control Valve

The Standard Ignition AC399 Idle Air Control Valve is designed to regulate the engine's idle speed by controlling airflow in fuel injection systems. This part is compatible with various BMW and Saab models, ensuring precise idle control and smooth engine performance.

• Compatible with BMW models including 323Ci, 325i, 328i, 330i, M3, X3, X5, Z3, and Z4
• Fits Saab 9-3 and 900 models
• Part number AC399 for accurate identification
• Controls idle speed by managing airflow in fuel injection systems
• Direct replacement for factory idle air control valves

Detailed Product Description

The Standard Ignition AC399 Idle Air Control Valve is engineered to maintain optimal engine idle speed by regulating the amount of air bypassing the throttle plate. This component is essential for fuel injection systems in BMW and Saab vehicles, including popular models such as the BMW 325i, 328i, 330xi, and Saab 9-3. By ensuring consistent idle speed, the AC399 helps prevent stalling, rough idling, and poor engine response during idle conditions.

Common Applications and Issues Addressed

• Resolves engine stalling at idle
• Eliminates rough or fluctuating idle speed
• Improves cold start performance
• Corrects idle speed surges or drops
• Supports smooth engine operation during deceleration

Installation Notes and Tips

• Ensure the engine is cool before installation to avoid injury
• Disconnect the battery to prevent electrical shorts
• Remove the old idle air control valve carefully to avoid damaging the throttle body
• Clean the mounting surface before installing the new valve
• Verify electrical connections are secure after installation

Quality Assurance and Warranty

Standard Ignition parts are manufactured to meet or exceed OEM specifications for fit, form, and function. The AC399 Idle Air Control Valve undergoes rigorous quality control to ensure reliable performance. While specific warranty details may vary, Standard Ignition typically offers a limited warranty covering defects in materials and workmanship.