Chevrolet Silverado / GMC Sierra. Service manual — part 1792

EXHAUST LEAKAGE

8

Oxygen Sensor Replacement -
Bank 1 Sensor 2 or Heated Oxygen
Sensor Replacement - Bank 2
Sensor 2 for the 4.3L engine, or to
Heated Oxygen Sensor
Replacement - Bank 1 Sensor 2
(1500 Series) or Heated Oxygen
Sensor Replacement - Bank 1
Sensor 2 (2500 Series) or Heated
Oxygen Sensor Replacement -
Bank 1 Sensor 2 (2500 Series -
Cab/Chassis) or Heated Oxygen
Sensor Replacement - Bank 2
Sensor 2 (1500 Series) or Heated
Oxygen Sensor Replacement -
Bank 2 Sensor 2 (2500 Series) or
Heated Oxygen Sensor
Replacement - Bank 2 Sensor 2
(2500 Series - Cab/Chassis) for the
4.8L, 5.3L, 6.0L, and 6.2L engines.

3. Clear any codes.

4. Road test the vehicle in order to

verify the repair.

Did you correct the condition?

-

System OK Go to Step 2

Problem

Action

DEFINITION: An exhaust leak may show stains at the area of the leak. The leak may be
felt by holding a hand close to the suspected areas or using a smoke pencil. The leak may
make a popping or hissing noise.Refer to Symptoms - Engine Exhaust prior to beginning
this table.

CAUTION:

While engine is operating, the exhaust system will become extremely hot. To prevent burns avoid
contacting a hot exhaust system.

Misaligned or improperly
installed exhaust system

Align and tighten the components to the specifications.
Refer to Fastener Tightening Specifications.

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

components.

Ensure the exhaust hangers are in the proper locations
and not loose.

Exhaust leaks at the
following connections:

Exhaust manifold to
pipe

Flanges

Pipe clamps

Tighten the components to the specifications. Refer to
Fastener Tightening Specifications.

Seals or gaskets leaking.

Exhaust manifold to
cylinder head

Exhaust pipes to
exhaust manifold

Catalytic converter
connection

EGR connections, if
equipped

Replace the leaking seal or gasket. Refer to the affected
components procedure for service.

Irregularities at the mating
surfaces on the flange
connections.

Repair as required or replace the affected component. Refer
to the affected components procedure for service.

Exhaust manifold cracked or
broken.

Replace the exhaust manifold. Refer to:

Exhaust Manifold Replacement - Left Side (4.3L) or
Exhaust Manifold Replacement - Left Side (4.8L,
5.3L, 6.0L, and 6.2L) or Exhaust Manifold
Replacement - Left Side (6.6L)

Exhaust Manifold Replacement - Right Side (4.3L)
or Exhaust Manifold Replacement - Right Side
(4.8L, 5.3L, 6.0L, and 6.2L) or Exhaust Manifold
Replacement - Right Side (6.6L).

Exhaust system component
connection welds leaking.

Replace the leaking component. Refer to the affected
component's procedure for service.

Muffler damaged or leaking
at the seams.

Replace the affected muffler. Refer to Muffler Replacement
(1500 Series w/4.3L, 4.8L, 5.3L, 6.0L) or Muffler
Replacement (1500 Series w/6.2L) or Muffler

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

EXHAUST NOISE

Replacement (2500/3500 Series w/6.0L) or Muffler
Replacement (2500/3500 - Cab/Chassis w/6.0L) or
Muffler Replacement (6.6L).

Condition

Action

DEFINITION: An audible or physical noise due to a faulty component or damaged
components causing a loose or misaligned exhaust system resulting in a rattle or vibration
noise (buzz, groan, hum).Refer to Symptoms - Engine Exhaust prior to beginning this
table.

CAUTION:

While engine is operating, the exhaust system will become extremely hot. To prevent burns avoid
contacting a hot exhaust system.

Popping or hissing noise

Exhaust leak. Refer to Exhaust Leakage.

Loud exhaust

1. Compare to a known good vehicle.

2. Inspect for a damaged or failed muffler or resonator.

3. Replace the faulty muffler. Refer to Muffler

Replacement (1500 Series w/4.3L, 4.8L, 5.3L, 6.0L)
or Muffler Replacement (1500 Series w/6.2L) or
Muffler Replacement (2500/3500 Series w/6.0L) or
Muffler Replacement (2500/3500 - Cab/Chassis
w/6.0L) or Muffler Replacement (6.6L).

External rattle or vibration
noise

1. Inspect for a bent or loose hanger, loose heat shield, or

loose clamp.

2. Inspect for a exhaust pipe causing interference.

3. Repair or replace the affected component. Refer to the

affected component's service procedure.

Internal rattle

1. Test the components by tapping with a rubber mallet to

confirm a rattle.

2. Replace the faulty catalytic converter, or muffler. Refer

to one of the following procedures:

Catalytic Converter Replacement (4.3L)
Catalytic Converter Replacement (4.8L, 5.3L,
6.0L, 6.2L)Catalytic Converter Replacement
(6.6L)

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

REPAIR INSTRUCTIONS

EXHAUST MANIFOLD REPLACEMENT - LEFT SIDE (4.3L)

Removal Procedure

Muffler Replacement (1500 Series w/4.3L, 4.8L,
5.3L, 6.0L)Muffler Replacement (1500 Series
w/6.2L)Muffler Replacement (2500/3500 Series
w/6.0L)Muffler Replacement (2500/3500 -
Cab/Chassis w/6.0L)Muffler Replacement
(6.6L)

2008 Chevrolet Silverado 1500

2008 ENGINE Engine Exhaust - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado