When idle speed starts to hunt, surge or drop out at a stop, a worn idle air control valve may be the cause. The Standard Ignition Idle Air Control Valve AC1 is a direct-fit replacement for many vehicles, among them the 1988-1995 Chevrolet C1500 (V6-4.3L, V8-5.0L, V8-5.7L) and the 1988-1995 Chevrolet K1500 (V6-4.3L, V8-5.0L, V8-5.7L, V8-6.2L, V8-6.5L). See the "Vehicles it fits" section for the full list of vehicles and engines.
The valve meters the air that bypasses the closed throttle plate. The engine computer commands it to manage idle speed.
- Connector and terminals: The square connector has 4 terminals made with OE-quality materials. They are designed for an exact-fit connection to the engine wiring harness and proper conductivity.
- Temperature resistance: The valve is manufactured with epichlorohydrin material that withstands vehicle temperatures from -40°F to 257°F. This helps it keep functioning across that range.
- Pintle control: A polymer blended, isotropic neodymium/iron/boron magnet provides accurate control of the pintle and the airflow it meters.
- Sealing: A high-heat-resistant sealant helps keep particulate contamination out while allowing pressure equalization.
Gaskets are included, and the valve has a single port. The listed applications use one valve each. Country of origin: Mexico.
Interchange: 2-1738 · 2-IAC1
21738 · 2IAC1 · IAC1 · AC102 · 17079256 · 17111286 · 17111288 · 17111289 · 17111460 · 17111461 · 1711286 · 22048226 · 25527077 · 8171114600 · 8255270770 · AC1T · ERR5199 · ETC6660
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
21738, IAC1, AC102, 2-1738, 17079256, 17111286, 17111288, 17111289, 17111460, 17111461, 1711286, 22048226, 25527077, 8171114600, 8255270770, 2-IAC1, AC1T, ERR5199, ETC6660
Frequently Asked Questions
What does an idle air control valve do?
It meters the air that bypasses the closed throttle plate, as commanded by the engine computer, to manage idle speed. The AC1 uses a neodymium/iron/boron magnet to control its pintle.
What are signs this valve may need replacing?
Signs include an idle that hunts or surges, an idle that is too high or too low, and stalling when coming to a stop. These symptoms can have other causes, so diagnose before replacing.
Does the AC1 come with a gasket?
Yes, gaskets are included. The valve has a square electrical connector with 4 terminals and a single port.
Will the AC1 fit my vehicle?
It is listed for vehicles such as the 1988-1995 Chevrolet C1500 (V6-4.3L, V8-5.0L, V8-5.7L) and 1988-1995 Chevrolet K1500 (V6-4.3L, V8-5.0L, V8-5.7L, V8-6.2L, V8-6.5L). Check the "Vehicles it fits" section for your exact vehicle.
What temperatures is this valve built to handle?
It is manufactured with epichlorohydrin material to withstand vehicle temperatures from -40°F to 257°F.
