HomeAir and Fuel Delivery > Fuel Injection System and Related ComponentsStandard Ignition AC291 Idle Air Control Valve
Part #: AC291

Standard Ignition AC291 Idle Air Control Valve

⚙️ 3 vehicles fit this part
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Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: Ford and Mercury, Explorer and Mountaineer
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Reliable Idle Air Control Valve for Ford Explorer and Mercury Mountaineer

The Standard Ignition AC291 Idle Air Control Valve is designed to regulate the engine's idle speed by controlling airflow. This component is compatible with Ford Explorer and Mercury Mountaineer models, ensuring precise idle performance and smooth engine operation.

  • Connector Shape: Square for secure electrical connection
  • Includes Gaskets for proper sealing and leak prevention
  • Single Port Design for efficient airflow control
  • Two-Terminal Configuration for reliable electrical interface
  • Hardware not included, allowing for flexible installation options

Product Details and Specifications

The AC291 Idle Air Control Valve from Standard Ignition features a square-shaped connector that ensures a stable and accurate electrical connection. It comes with gaskets included to maintain a tight seal and prevent air leaks, which is critical for maintaining consistent idle speed. The valve has one port and two terminals, designed to fit the specific requirements of the fuel injection system in Ford Explorer and Mercury Mountaineer vehicles. While hardware is not included, this allows technicians to use existing or preferred mounting components during installation.

Compatible Vehicles and Applications

This idle air control valve is compatible with the following vehicles:

  • Ford Explorer
  • Mercury Mountaineer

Use the Standard Ignition AC291 to address idle-related issues in these models, ensuring proper air and fuel delivery during engine idle conditions.

Common Issues Addressed by the AC291 Idle Air Control Valve

  • Irregular or fluctuating engine idle speed
  • Engine stalling during idle or low-speed operation
  • Difficulty starting the engine or rough idle after startup
  • Check engine light triggered by idle control faults
  • Reduced fuel efficiency due to improper air control

Installation Notes and Tips

When installing the Standard Ignition AC291 Idle Air Control Valve, ensure the following:

  • Verify compatibility with your Ford Explorer or Mercury Mountaineer model year and engine type
  • Use the included gaskets to prevent air leaks and maintain proper sealing
  • Check the square connector for secure and corrosion-free electrical contact
  • Retain or source appropriate mounting hardware as it is not included with this part
  • Follow manufacturer torque specifications to avoid damage during installation

Quality Assurance and Warranty

Standard Ignition parts are manufactured to meet or exceed OEM standards for fit, form, and function. The AC291 Idle Air Control Valve undergoes rigorous quality control to ensure reliable performance in Ford Explorer and Mercury Mountaineer vehicles. Please refer to Standard Ignition's warranty policy for specific coverage details.

BrandStandard Ignition
Part NumberAC291
Connector ShapeSquare
Gaskets IncludedYes
Hardware IncludedNo

This part fits 3 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
1998FordExplorer4.0LV6N/APrimary application for specific vehicle models ~ Idle Air Control Valve
1998MercuryMountaineer4.0LV6N/APrimary application for specific vehicle models ~ Idle Air Control Valve
1997FordExplorer4.0LV6N/APrimary 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:

150-2004192361272-29575215-2048229734J102073-48548891977597JF9F715BAABV0052ACVB10052CV10112CX2381

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.