Installation Procedure

Fig 1: HO2S At Catalytic Converter

Courtesy of GENERAL MOTORS CORP.

Install the heated oxygen sensor (HO2S) to the catalytic converter. Refer to HEATED OXYGEN SENSOR .

Fig 2: View Of Catalytic Converter Mounting Nuts

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NOTE: To prevent internal damage to the flexible coupling of the catalytic converter assembly, the converter must be supported. The vertical movement at the rear of the catalytic converter assembly must not exceed 6 degrees up or down.

Install a new gasket to the exhaust pipe studs.
Install a new exhaust manifold pipe gasket.

NOTE: Refer to Catalytic Converter Movement Notice in Cautions and Notices.

Install and support the 3-way catalytic converter.
Install the catalytic converter nuts.

Fig 3: Exhaust Manifold Pipe Stud, Nut & Gasket (3.4L)

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NOTE: Refer to Fastener Notice in Cautions and Notices.

Install the exhaust manifold pipe stud nuts.
Tighten:
- Tighten the exhaust manifold pipe stud nuts to 35 N.m (26 lb ft).
- Tighten the catalytic converter nuts to 60 N.m (44 lb ft).

Fig 4: View Of Catalytic Converter Hangers

Courtesy of GENERAL MOTORS CORP.

Install the catalytic converter hangers.
Connect the heated oxygen sensor (HO2S) electrical connector.
Lower the vehicle.
Inspect the exhaust system for leaks.