What is the purpose of the Idle Air Control (IAC) valve on Ford Bronco II?

The Idle Control Valve is responsible for controlling engine idle speed and has some dashpot functions as well. It is placed in the throttle body to enable free passage of air bypassing the throttle plate which will maintain desired idle speed. To test for the valve, switch off the ignition and unplug the wiring harness. Use an ohmmeter to measure the resistance between terminals. If it does not show 7-13 ohms, replace it with a new one. Take off the battery after disconnecting the wiring harness. Unscrew the mounting screws, remove the old gasket, and clean up mounting surface. Screw in tightly while using a fresh gasket again. Reconnect your wiring and re-connect your battery after that.

Genuine Ford Bronco II Idle Control Valve

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4 Idle Control Valves found

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Ford Bronco II Valve Assembly - Throttle
Part Number: E9AZ-9F715-A
$66.22 MSRP: $109.45
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Product Specifications
- Other Name: VALVE ASY - THROTTLE
- Replaced by: E9AZ-9F715-AA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1989-1990 Ford Bronco II | 6 Cyl 2.9L | 4AT A4LD, 4AT AOD, 4MT, 5MT
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Ford Bronco II Valve Assembly Air Bypass
Part Number: E3TZ9B289G
Product Specifications
- Other Name: Valve Assy - Air By-Pass
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1984-1989 Ford Bronco II | 4 Cyl 2.3L, 6 Cyl 2.8L, 6 Cyl 2.9L | 3AT C5, 4AT A4LD, 4MT, 5MT
View related parts
Ford Bronco II Valve Assembly Air Bypass
Part Number: E8DZ9B289B
Product Specifications
- Other Name: Valve Assy - Air By-Pass; By-Pass Valve
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1984-1989 Ford Bronco II | 4 Cyl 2.3L, 6 Cyl 2.8L, 6 Cyl 2.9L | 3AT C5, 4AT A4LD, 4MT, 5MT
View related parts
Ford Bronco II Valve Assembly - Throttle
Part Number: E9DZ-9F715-A
Product Specifications
- Other Name: VALVE ASY - THROTTLE
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1986-1988 Ford Bronco II | 4 Cyl 2.3L, 6 Cyl 2.9L | 4AT A4LD, 4MT, 5MT

Ford Bronco II Idle Control Valve Parts Questions & Experts Answers

Valve Assembly - Throttle
E9AZ-9F715-A
Q: What is the purpose of the Idle Air Control (IAC) valve on Ford Bronco II?
A: The Idle Control Valve is responsible for controlling engine idle speed and has some dashpot functions as well. It is placed in the throttle body to enable free passage of air bypassing the throttle plate which will maintain desired idle speed. To test for the valve, switch off the ignition and unplug the wiring harness. Use an ohmmeter to measure the resistance between terminals. If it does not show 7-13 ohms, replace it with a new one. Take off the battery after disconnecting the wiring harness. Unscrew the mounting screws, remove the old gasket, and clean up mounting surface. Screw in tightly while using a fresh gasket again. Reconnect your wiring and re-connect your battery after that.