GM 15744828
Front Pipe

The replacement of a pick up's Catalytic Converter begins with proper safety gear before the vehicle elevation and secure support. Loosen the transmission support before breaking the electrical connection of lh pre-converter heated Oxygen Sensor (H02S), rh pre-converter heated Oxygen Sensor (H02S), and post-converter heated Oxygen Sensor (H02S). The next step involves taking off the Muffler to Catalytic Converter flange nuts to separate the Muffler from the Catalytic Converter. First remove all Catalytic Converter to Exhaust Manifold flange nuts before extracting the Catalytic Converter from its rubber hanger with both gaskets intact. Loosen heated oxygen sensors (H02S) only when required. The heated Oxygen Sensor (H02S) installation should always start first followed by the Catalytic Converter and application of new gaskets. Frontally mount your Catalytic Converter to the rubber hanger before installing it on the Exhaust Manifold and tightening its flange nuts to 39 ft lbs (53 Nm). Mount the Muffler to its position on the Catalytic Converter with a brand-new gasket and tighten the flange nuts to 40 nm (30 ft. Lbs.). Reintegrate power cables running to the post-converter heated Oxygen Sensor (H02S), rh pre-converter heated Oxygen Sensor (H02S) and lh pre-converter heated Oxygen Sensor (H02S). Lower the vehicle while putting back the transmission support at the end of the replacement process.

Begin replacing the Catalytic Converter on a pickup 4.3l by putting on protective goggles and gloves first. Mount the vehicle at the proper height before beginning work. The transmission support should be removed according to necessity. First disconnect the electrical connections that lead to the lh, rh and post-converter heated Oxygen Sensor (H02S). Start by removing nuts from the Muffler to Catalytic Converter flange then remove the Muffler from the assembly. Start by unbolidng the flange nuts from the Exhaust Manifold and proceed to separate the Catalytic Converter from its rubber hanger and any present gaskets. You must remove heated oxygen sensors (H02S) only if needed. Install the heated Oxygen Sensor (H02S) as needed followed by the Catalytic Converter and new gaskets then complete the installation sequence. Position the Catalytic Converter onto the rubber hanger then use flange nuts to connect it to the Exhaust Manifold by torquing them to 53 nm (39 ft. Lbs.). Affix the Muffler to the Catalytic Converter along with a new gasket while tightening the flange nuts to a torque of 40 nm (30 ft. Lbs.). Connect the heated Oxygen Sensor (H02S) electrical wires with both rh and lh post-converter and rh and lh heated Oxygen Sensor components. Install the transmission support before lowering the vehicle to its original position.

Remove the left and right exhaust manifold pipe nuts, followed by the exhaust muffler nuts, and finally, remove the catalytic converter.

The catalytic converter.

Place the new seal and exhaust manifold pipe onto the vehicle.

A new gasket.

Take out the exhaust manifold pipe to manifold flange bolts and remove the exhaust manifold pipe and seal from the vehicle.