Keep engine idle under control with the Standard Ignition Idle Air Control Valve (AC526), a direct-fit replacement for the 2000 Toyota 4Runner (L4-2.7L) and the 2000-2004 Toyota Tacoma (L4-2.4L and L4-2.7L). The idle air control valve regulates the volume of air routed around the closed throttle plate, letting the engine control module hold a steady idle during cold starts, warm-up, and changing accessory loads.
- Idle-air metering: controls the air that bypasses the throttle plate so the ECM can maintain a stable idle speed.
- Direct-fit application: installs on the listed Toyota 4Runner and Tacoma applications.
- Signs it may need replacing: a rough or erratic idle, unexpected stalling, or an idle speed that surges or hangs — all possible indicators the idle air control valve may need attention.
If a failing idle air control valve is the cause of your idle trouble, this AC526 replaces it; because those symptoms can also come from vacuum leaks, sensors, or throttle-body deposits, diagnose the cause before replacing. The listed applications use one valve per vehicle.
Manufacturer part number AC526.
Frequently Asked Questions
What does the AC526 idle air control valve do?
It regulates the amount of air that bypasses the closed throttle plate, letting the engine control module maintain a stable idle during cold starts, warm-up, and changing accessory loads.
Which vehicles does the AC526 fit?
It's a direct-fit replacement for the 2000 Toyota 4Runner (L4-2.7L) and the 2000-2004 Toyota Tacoma (L4-2.4L and L4-2.7L). Check the Buyer's Guide tab to confirm your vehicle.
What are signs my idle air control valve may need replacing?
Common signs include a rough or erratic idle, unexpected stalling, or an idle speed that surges or hangs. These can have other causes, so diagnose before replacing.
Should I diagnose the problem before installing this valve?
Yes. A rough idle or stalling can also come from vacuum leaks, sensors, or throttle-body deposits, so confirm the idle air control valve is the cause before replacing it.
How many valves do the listed applications use?
The listed Toyota 4Runner and Tacoma applications use one valve per vehicle. This listing supplies the quantity stated in the package.
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