Keep idle airflow under precise control with the Standard Ignition AC27 Idle Air Control Valve. This fuel injection idle air control valve is a direct-fit replacement for the listed applications. It fits many vehicles, among them the 1994-1995 Chevrolet Camaro (V8-5.7L), 1994-1996 Buick Century (V6-3.1L) and 1990-1995 Buick Regal (V6-3.8L). See the "Vehicles it fits" section for the full list.
At idle the throttle plate is nearly closed, so the engine computer uses the IAC valve to meter air around it. A stepping motor moves the valve's pintle to open or restrict that bypass passage. This is designed to help hold a steady idle speed as engine loads change.
- High-strength stepping motor: Built to produce high output torque. A shielded ball bearing in the motor resists environmental contaminants for an extended service life.
- Load tested: Standard Ignition's IACs undergo load testing to confirm the actuator delivers more force than the actual load it works against, for added durability.
- Accurate pintle control: A polymer blended, isotropic neodymium/iron/boron magnet is designed to provide accurate control of the pintle and airflow.
- Controlled quality: As a global manufacturer of emission components, Standard Ignition maintains quality control from componentry through the finished product and uses high-grade materials.
Specifications: 4 terminals with an oval connector and 1 port. A gasket is included; mounting hardware is not included. The listed applications use one valve per vehicle. Country of origin: Mexico.
Signs an idle air control valve may need replacing include a surging or hunting idle, an idle that runs too high or too low, rough idle, or stalling when coming to a stop. Vacuum leaks and other faults can produce similar symptoms, so diagnose the cause before replacing.
Interchange: 2-1813
21813 · IAC23 · AC116 · AC140 · 17112478 · 17112479 · 17113099 · 19333272 · AC27T
This part cross-references / interchanges with the following part numbers:
21813, IAC23, AC116, AC140, 2-1813, 17112478, 17112479, 17113099, 19333272, AC27T
Frequently Asked Questions
What does the AC27 idle air control valve do?
It regulates the air that bypasses the closed throttle plate at idle. A stepping motor moves the pintle to open or restrict that passage so the engine computer can control idle speed.
Does it come with a gasket and mounting hardware?
A gasket is included; mounting hardware is not. Consult the vehicle service information for the correct fasteners and whether the originals may be reused.
What are signs the IAC valve may need replacing?
Signs include a surging or hunting idle, an idle that is too high or too low, rough idle, or stalling at stops. Vacuum leaks can cause similar symptoms, so diagnose the cause before replacing.
Which vehicles does it fit?
Listed applications include the 1994-1995 Chevrolet Camaro (V8-5.7L), 1994-1996 Buick Century (V6-3.1L) and 1990-1995 Buick Regal (V6-3.8L). See the "Vehicles it fits" section for the full list.
What electrical connector does it use?
It has an oval connector with 4 terminals and a single port. The listed applications use one valve per vehicle.
