GM 91175657
Muffler & Pipe

First, to service and repair the Muffler, raise and support the vehicle. Remove the two nuts from the Catalytic Converter assembly and disconnect the Catalytic Converter assembly from resonator/Muffler/ Tail Pipe assembly. Next, remove the hangers used to hold the resonator/Muffler/Tail Pipe assembly in and take it out of the vehicle. Before installing a new component of an exhaust system, clean the gasket and mating surfaces of the seal and make sure to use new gaskets and seals. Secure the resonator/Muffler/tailpipe assembly back onto the vehicle and support it using hangers. The resonator/Muffler/Tail Pipe assembly is then installed with a fresh gasket onto the Catalytic Converter assembly and fastened with two nuts - do not tighten them too tight this time. In order to prevent noise or vibrations before the bolts are tightened, all system component must be aligned and the Catalytic Converter to resonator/Muffler/Tail Pipe assembly bolts matched to 50 nm (37 ft. Lbs.). Finally, lower the vehicle.

The Exhaust Pipe servicing needs the vehicle lift along with vehicle support before beginning the work. Two bolts securing the Exhaust Manifold front pipe/twc assembly need removal so the electrical ho2s2 connector from the heated Oxygen Sensor can be unconnected. Take off two nuts which will lead to separating the front pipe/twc assembly from its place on the resonator/muffler/tail pipe assembly. Subsequently detach the hanger that supports the twc. You should first remove the front pipe/twc assembly from the vehicle before cleaning both the gasket and seal mating surfaces. The installation of any new exhaust system component requires using exclusive fresh gaskets and seals. Position the front pipe/twc assembly to its vehicle seating and use a hanger for twc support. Screw two nuts into the front pipe/twc assembly to join it with the resonator/muffler/tail pipe assembly but refrain from full bolting them at this stage. Secure the electrical connector of heated Oxygen Sensor (HO2S2) before you attach the front pipe/twc assembly to the Exhaust Manifold using new seals. Then tighten its two bolts loosely. Translation of all system components comes before fastener tightening to minimize noise production and vibration. Use a torque wrench to secure the front pipe/twc assembly-to-exhaust manifold bolts at 50 nm (37 ft. Lbs.) as well as the front pipe/twc assembly-to-resonator/muffler/tail pipe assembly nuts at 35 nm (26 ft. Lbs.). Finally, lower the vehicle.

Take out 1 bolt and 1 nut from the exhaust manifold pipe bracket.

All system components should be aligned to prevent noise or vibrations.

Attach it with a new gasket and secure it with TWC nuts, ensuring not to fully tighten them at this stage.

Remove the hanger that supports the TWC.

Clean the gasket and the seal mating surfaces and ensure to use new gaskets and seals.