Question 1

How to replace the rear catalytic converter on a 3.5L engine on Chevrolet Malibu?

Accepted Answer

The replacement of rear catalytic converters from 3.5l engines starts by uninstalling the main Muffler assembly. Remove the connector position assurance (CPA) retainer from the system while disconnecting the heated oxygen sensor (HO2S) electrical connector but make sure the permanently attached pigtail stays intact. The heated oxygen sensor wrench (J 39194-B) should be used to detach the ho2s . Start by removing the Catalytic Converter to rear Catalytic Converter nuts, then proceed to the Catalytic Converter bolt and nuts at the Exhaust Manifold, and conclude by taking out the rear Catalytic Converter . Dispose of the old gasket and confirm that the Catalytic Converter-to-exhaust manifold flange shows no more than 0.7 mm (0.028 inch) maximum deformation during inspection. During installation place a new gasket onto the Catalytic Converter studs before installing the rear Catalytic Converter then secure it with the Catalytic Converter bolt and nuts at the Exhaust Manifold using 31 nm of torque (23 ft. Lbs.). Secure the front Catalytic Converter to the rear Catalytic Converter using nuts while twisting them to 31 nm (23 ft. Lbs.). Use the heated oxygen sensor wrench (J 39194-B) to reinstall the ho2s and tighten it to 42 nm (31 ft. Lbs.). Afterward, connect the ho2s electrical connector and install the cpa retainer. Reinstall the Muffler assembly before beginning the engine and checking for exhaust leaks.

Question 2

How to replace the catalytic converter on 4.81- and 5.31-engine on Chevrolet Tahoe?

Accepted Answer

In order to replace the Catalytic Converter on 4.81- and 5.31- engines the first task to undertake is to raise and support the vehicle. Unbolting then remove the engine shield bolts and shield, and oil pan skid plate bolts and plate if needed. Pull out the Oxygen Sensor connection from the floor reinforcement, remove the clip around the engine harness and air sensor pigtail, and remove the connector position assurance (CPA) retainers and Oxygen Sensor electrical connectors. Disconnect the Oxygen Sensor electrical connectors from the hose clip and transmission crossmember, and remove cpa retainers, and Oxygen Sensor electrical connectors (1, 2). Take off the left and right exhaust manifold pipe nuts, exhaust muffler nuts, and then the Catalytic Converter. In the case of replacing the Catalytic Converter apply anti-seize compound gm p/n 12377953 or equivalent to the threads of the old oxygen sensors; install and tighten to 42 nm (31ft.lbs). Next, then install the catalyticconverter and new exhaust manifold pipe seals to the exhaust manifolds followed by the right and left exhaust manifold pipe nuts, tighten thetop to fifty nm (39 ft.Words). Attach the exhaust muffler nuts and tighten them to 40 nm (30 ft. Lbs.). Connect the Oxygen Sensor electrical connectors (1,2) and the cpa retainers, and attach the oxygen sensors electrical connectors to the hose clip and transmission crossmember. Connect the Oxygen Sensor electrical connectors and the cpa retainers, install the clip through the engine harness and the Oxygen Sensor pigtail and clip the connection of the Oxygen Sensor to the floor reinforcement. Lastly, install the oil pan skid plate and the bolts if needed with a torque of 20 nm (15 ft. Lbs.) followed by the engine shield and bolts if needed with a torque of 20 nm (15 ft. Lbs.); then lower the vehicle.

Question 3

How to replace the catalytic converter on Chevrolet SSR?

Accepted Answer

Begin Catalytic Converter replacement by properly elevating the vehicle. Remove the connector from the Oxygen Sensor that is attached to the floor reinforcement before removing its clips from the frame structure. Remove the connector position assurance retainers alongside the Oxygen Sensor electrical connectors from the system. First remove Oxygen Sensor electrical connections from attachments on the hose clip and transmission crossmember before you re-attach the cpa retainers together with Oxygen Sensor electrical connectors (1, 2). Disassemble the exhaust system by removing exhaust manifold pipe nuts at each side and exhaust muffler nuts then pull out the transmission support before getting rid of the Catalytic Converter. Remove the oxygen sensors when necessitated. The threads of old oxygen sensors require gm p/n 12377953 or equivalent anti-seize compound before installation and tightening to 42 nm (31 ft. Lbs.) torques. You need to install both the Catalytic Converter and transmission support. New exhaust manifold pipe seals should be installed to each exhaust manifold followed by a right and left exhaust manifold pipe nut snug rotation to a torque setting of 50 nm (37 ft. Lbs.). Screw and tighten exhaust muffler nuts until they reach 45 nm (33 ft. Lbs.). Link the Oxygen Sensor electrical connectors (1, 2) and install cpa retainers before fastening the oxygen sensors electrical connectors to a hose clip supported by the transmission crossmember. You should lower the vehicle before performing these steps: install the clip around the engine harness and the Oxygen Sensor pigtail, clip the Oxygen Sensor connection to the floor reinforcement, reattach the cpa retainers then Oxygen Sensor electrical connectors, and lastly install the clip.

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