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Idle Air Control Valve (IAC)

This category on the website [ Servos Valves and Wiring ] we are giving you all of the information related to the individual parts in the Buick Turbo Regal, along with the associated wiring, connector plugs, etc.

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VEHICLE APPLICATION:

Buick Regal, T-Type, Turbo T, Limited, Grand National, GNX

VALVE NAME:

Idle Air Control Valve (IAC)

PURPOSE OF VALVE:

controls the air flow at idle

TURNS ON-OFF / FUNCTIONS / USED WHEN:

in constant use when the engine is running

LOCATION IN VEHICLE:

engine compartment, front of motor, underneath up pipe, front side of throttle body

ORIGINAL GM PART NUMBER:

25527077

VALVE BASE COLOR:

black
replacements are (silver colored) metal

CONNECTOR PLUG COLOR (VALVE SIDE):

black

WIRES ATTACHED (VALVE SIDE):

n/a

CONNECTOR PLUG COLOR (HARNESS SIDE):

black

NUMBER OF WIRES ATTACHED (HARNESS SIDE):

4

COLOR & PURPOSE OF (HARNESS SIDE) WIRES:

blue-white “A”, goes to ECM (“C5” coil A high)
blue-black “B”, goes to ECM (“C6” coil A low)
light green-white “C”, goes to ECM (“C4” coil B high)
light green-black “D”, goes to ECM (“C3” coil B low)

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OTHER NOTES:

this is actually an electric motor.

some people use a custom angled adapter plate to mount the IAC valve in (this offsets the motor 45 degrees for better up pipe clearance).

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PHOTOS OF VALVE AND CONNECTED WIRES:
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84-85 ecm iac tcc wg aldl evrv ac brake sw

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Here’s a list of all of the Solenoids Modules and Servos Valves in the Buick Regal:
(click the links to go to the one you need info about)

* Canister Purge Solenoid (Fuel Vapor Canister Purge)
* Chime Module (Chime Alarm)
* Cruise Control Module
* Cruise Control Servo
* EGR Valve
* ESC Module
* Exhaust Gas Recirculation Vacuum Regulator Valve Solenoid (EGR EVRV)
* Heater Flow Water Control Valve
* HVAC Control Vacuum Valve (mode control valve)
* Idle Air Control Valve (IAC)
* PCV Valve (Positive Crankcase Ventilation)
* Proportioning Valve (Prop Valve)
* Starter Solenoid
* Theft Deterrent Controller Module (anti-theft system)
* Torque Converter Clutch Solenoid (TCC)
* Trunk Release Solenoid
* Vacuum Check Valves
* Wastegate Control Solenoid

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