Removal Procedure

Fig 1: Identifying Exhaust Manifold Cover And Bolts

Courtesy of GENERAL MOTORS CORP.

CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.

Disconnect the negative battery cable.

NOTE: Handle the oxygen sensors carefully in order to prevent damage to the component. Keep the electrical connector and the exhaust inlet end free of contaminants. Do not use cleaning solvents on the sensor. Do not drop or mishandle the sensor.

Disconnect the oxygen sensor electrical connector.
Remove the exhaust manifold cover with the bolts.

Fig 2: View Of Catalytic Converter Upper Flange Nuts

Courtesy of GENERAL MOTORS CORP.

IMPORTANT: The nuts and the stud may unscrew as a unit because of the high temperature associated with the exhaust manifold, but they can be re-used as such.

Remove the catalytic converter upper flange nuts.

Fig 3: View Of Exhaust Pipe Mounting Bracket Bolt And Catalytic Converter Flange Nuts

Courtesy of GENERAL MOTORS CORP.

Remove the exhaust front pipe mounting bracket bolt.
Remove the nuts from the exhaust front pipe-to-catalytic converter flange.
Remove the catalytic converter and the gasket.
Clean the sealing surfaces on the exhaust front pipe flange and the exhaust manifold.
Inspect the exhaust front pipe and the exhaust manifold for holes, damage, open seams or other deterioration which could permit exhaust fumes to seep into the passenger compartment.