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Standard Ignition AC520 Idle Air Control Valve
Idle Air Control Valve for Mazda Miata
Standard Ignition AC520 is an idle air control valve for fuel injection systems, built with a female rectangular connector, 2 terminals, and 2 ports. It includes a gasket for a proper seal and is listed for Mazda Miata applications from 1999-2005.
Key Features
- Idle Air Control Valve for air and fuel delivery systems
- Automatic air control valve type
- Female rectangular connector with 2 terminals
- 2-port design for the specified application
- Gaskets included for installation sealing
- Standard Ignition AC520 replacement part
Application Details
Standard Ignition AC520 is used to regulate bypass air around the throttle plate so the engine can maintain a stable idle under changing load conditions. It is a direct-fit idle air control valve for Mazda Miata models in the listed years, including 1999-2005 Mazda Miata and 2000-2005 Mazda Miata. This part cross-references Beck/Arnley 159-1021 for the same application.
What It Helps Address
- Unstable or fluctuating idle speed
- Stalling when coming to a stop
- Idle speed that is too high or too low
- Idle quality issues after throttle closure
- Air bypass control problems in the fuel injection system
Installation Notes
Verify connector style, terminal count, and port layout before installation. Clean the throttle body and mating surfaces, then install the included gasket to help maintain a proper seal. Confirm the replacement matches the vehicle’s original idle air control valve configuration for Mazda Miata service.
Quality Assurance
Standard Ignition AC520 is built as a replacement component for the specified fuel injection application and is identified by OE-style fitment details for Mazda Miata service. Confirm part number AC520 against the vehicle application before installation.
| Brand | Standard Ignition |
|---|---|
| Part Number | AC520 |
| Connector Shape | Rectangular |
| Gaskets Included | Yes |
| Hardware Included | No |
This part fits 13 vehicles. Search below:
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2005 | Mazda | Miata | N/A | Primary application for specific vehicle models ~ Idle Air Control Valve | ||
| 2005 | Mazda | Miata | 1.8L | L4 | N/A | Compatible with various car models. |
| 2004 | Mazda | Miata | N/A | Primary application for specific vehicle models ~ Idle Air Control Valve | ||
| 2004 | Mazda | Miata | 1.8L | L4 | N/A | Compatible with various car models. |
| 2003 | Mazda | Miata | N/A | Primary application for specific vehicle models ~ Idle Air Control Valve | ||
| 2003 | Mazda | Miata | 1.8L | L4 | N/A | Compatible with various car models. |
| 2002 | Mazda | Miata | N/A | Primary application for specific vehicle models ~ Idle Air Control Valve | ||
| 2002 | Mazda | Miata | 1.8L | L4 | N/A | Compatible with various car models. |
| 2001 | Mazda | Miata | N/A | Primary application for specific vehicle models ~ Idle Air Control Valve | ||
| 2001 | Mazda | Miata | 1.8L | L4 | N/A | Compatible with various car models. |
| 2000 | Mazda | Miata | N/A | Primary application for specific vehicle models ~ Idle Air Control Valve | ||
| 2000 | Mazda | Miata | 1.8L | L4 | N/A | Compatible with various car models. |
| 1999 | Mazda | Miata | N/A | Primary application for specific vehicle models ~ Idle Air Control Valve |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.