Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSBUICK2005LESABRE LIMITED, 4T65E/M15REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - INTRODUCTIONREPAIR INSTRUCTIONSIDLE AIR CONTROL (IAC) VALVE REPLACEMENTINSTALLATION PROCEDURE

2005 Buick LeSabre Limited, 4T65E/M15

Installation Procedure

2005 Buick LeSabre Limited, 4T65E/M15SECTION Installation Procedure

NOTE: The IAC valve may be damaged if installed with the cone (pintle) extended more than 28 mm (1-1/8 in). Measure the distance that the valve is extended before installing a new valve. The distance from the idle air control valve motor housing to the end of the idle air control valve pintle should be less than 28 mm (1-1/8 in). Manually compress the pintle until the extension is less than 28 mm (1-1/8 in).

Fig 1: Removing/Installing IAC Valve "O" Ring

GM481091

Courtesy of GENERAL MOTORS CORP.

Install the new O-ring to the IAC valve.

Fig 2: Removing/Installing IAC Valve

GM481081

Courtesy of GENERAL MOTORS CORP.

Install the IAC valve into the throttle body.

Fig 3: Removing/Installing IAC Valve Attaching Screws

GM200431

Courtesy of GENERAL MOTORS CORP.

Install the IAC valve attaching screws.
Tighten: Tighten the screws to 3 N.m (27 lb in).

Fig 4: View Of IAC Valve Electrical Connector

GM155466

Courtesy of GENERAL MOTORS CORP.

Connect the electrical connector to the IAC valve.
The powertrain control module (PCM) will reset the IAC valve whenever the ignition switch is turned ON, then OFF.
Turn the ignition switch ON, then OFF.
Start the engine and allow the engine to reach a normal operating temperature.

Fig 5: Removing/Replacing Fuel Injector Sight Shield & Fuel Pressure Connection Cap

GM49594

Courtesy of GENERAL MOTORS CORP.

Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (L36) in Engine Mechanical.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.