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 MANUALSBUICK2006TERRAZA CXL, 3.5 L, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 101 (ENGINE CONTROL SYSTEM - 3.8L - INTRODUCTION (2 OF 2))REPAIR INSTRUCTIONSEXHAUST GAS RECIRCULATION (EGR) INLET PIPE REPLACEMENTINSTALLATION PROCEDURE

2006 Buick Terraza CXL, 3.5 L, AWD

Installation Procedure

2006 Buick Terraza CXL, 3.5 L, AWDSECTION Installation Procedure

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Removing/Installing EGR Valve Inlet Adapter Pipe

Courtesy of GENERAL MOTORS CORP.

Install the EGR valve inlet adapter pipe (1).

NOTE: Refer to Fastener Notice in Cautions and Notices.

Install the EGR valve inlet adapter pipe bolts (2).
Tighten: Tighten the bolts to 50 N.m (37 lb ft).
Raise the vehicle.

Fig 2: Removing/Installing EGR Valve Adapter Bolt & Right Exhaust Manifold

Courtesy of GENERAL MOTORS CORP.

Install the EGR valve inlet adapter pipe bolt to the exhaust manifold.
Tighten: Tighten the bolt to 25 N.m (18 lb ft).
Lower the vehicle.
Install the EGR valve outlet pipe. Refer to Exhaust Gas Recirculation (EGR) Outlet Pipe Replacement .
Install the EGR valve. Refer to Exhaust Gas Recirculation (EGR) Valve Replacement .

Fig 3: Removing/Installing Right Exhaust Manifold Heat Shield & Bolts

Courtesy of GENERAL MOTORS CORP.

Install the exhaust manifold heat shield.
Install the exhaust manifold heat shield bolts (2).
Tighten: Tighten the bolts to 10 N.m (89 lb in).
Install the HO2S. Refer to Heated Oxygen Sensor Replacement - Position 1 .
Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical - 3.8L.

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.