Chevrolet Silverado / GMC Sierra. Service manual — part 1790

J 45681

Jumper Harness

2008 Chevrolet Silverado 1500

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

2008 ENGINE

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

SPECIFICATIONS

FASTENER TIGHTENING SPECIFICATIONS

Application

Specification

Metric

English

Catalytic Converter to Exhaust Manifold Nut (4.3L,
4.8L, 5.3L, 6.0L, 6.2L)

50 N.m

37 lb ft

Catalytic Converter to Muffler Nut (4.3L, 4.8L,
5.3L, 6.0L, 6.2L)

45 N.m

33 lb ft

Catalytic Converter to Particulate Filter Nut (6.6L)

45 N.m

33 lb ft

Exhaust Gas Recirculation (EGR) Cooler Pipe
Bracket Upper Bolt (6.6L)

9 N.m

80 lb in

Exhaust Gas Recirculation (EGR) Cooler Pipe
Lower Bolt (6.6L)

9 N.m

80 lb in

Exhaust Heat Shield Nut

9 N.m

80 lb in

Exhaust Manifold Bolts (4.8L, 5.3L, 6.0L, 6.2L)

First Pass

15 N.m

11 lb ft

Final Pass

25 N.m

18 lb ft

Exhaust Manifold Bolt/Nut (6.6L)

First Pass

57 N.m

42 lb ft

4 Center Bolts an Additional Pass

57 N.m

42 lb ft

Exhaust Manifold Bolt/Stud (4.3L)

30 N.m

22 lb ft

Exhaust Manifold Heat Shield Bolt (4.3L, 4.8L,
5.3L, 6.0L, 6.2L)

9 N.m

80 lb in

Exhaust Manifold Heat Shield Bolt (6.6L)

10 N.m

89 lb in

Exhaust Manifold Pipe to Exhaust Manifold Nut
(6.0L)

50 N.m

37 lb ft

Exhaust Muffler Clamp (6.0L)

47 N.m

35 lb ft

Exhaust Muffler to Exhaust Manifold Pipe Nut
(6.0L)

45 N.m

33 lb ft

Exhaust Muffler to Exhaust Particulate Filter Nut
(6.6L)

45 N.m

33 lb ft

2008 Chevrolet Silverado 1500

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

2008 Chevrolet Silverado 1500

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

DIAGNOSTIC INFORMATION AND PROCEDURES

DIAGNOSTIC STARTING POINT - ENGINE EXHAUST

Begin the system diagnosis by reviewing the system Description and Operation. Reviewing the
information will help you determine the correct symptom diagnostic procedure when a
malfunction exists. It will also help you determine if the condition described by the customer is
normal operation. Refer to Symptoms - Engine Exhaust in order to identify the correct
procedure for diagnosing the system.

SYMPTOMS - ENGINE EXHAUST

Exhaust Pipe Bolt (6.6L)

53 N.m

39 lb ft

Exhaust Pipe Hanger Bracket Bolt (6.0L, 6.6L)

25 N.m

18 lb ft

Exhaust Pipe Heat Shield Bolt (6.6L)

10 N.m

89 lb in

Heated Oxygen Sensor (HO2S) (4.3L, 4.8L, 5.3L,
6.0L, 6.2L)

42 N.m

31 lb ft

Muffler to Catalytic Converter Nut (4.3L, 4.8L,
5.3L, 6.0L, 6.2L)

45 N.m

33 lb ft

Oil Level Indicator Tube Bolt (4.8L, 5.3L, 6.0L,
6.2L)

25 N.m

18 lb ft

Oil Level Indicator Tube Bolt (6.6L)

21 N.m

15 lb ft

Oil Pan Skid Plate Bolt

28 N.m

21 lb ft

Rear Shock Absorber Lower Bolt (6.0L, 6.2L,
6.6L)

95 N.m

70 lb ft

Steering Shaft Coupling Bolt/Nut (4.8L, 5.3L, 6.0L,
6.2L)

50 N.m

37 lb ft

Transmission Fluid Fill Tube Nut (6.6L)

18 N.m

13 lb ft

Transmission Mount to Support Nut (6.0L, 6.6L)

40 N.m

30 lb ft

Transmission Support Crossmember Bolt (6.0L,
6.6L)

95 N.m

70 lb ft

Turbocharger Exhaust Pipe to Bracket Bolt (6.6L)

34 N.m

25 lb ft

Turbocharger Exhaust Pipe to Catalytic Converter
Clamp (6.6L)

12 N.m

106 lb in

Turbocharger Exhaust Pipe Heat Shield Bolt (6.6L)

10 N.m

89 lb in

Turbocharger Exhaust Pipe to Turbocharger Clamp
Bolt (6.6L)

15 N.m

11 lb ft

Turbocharger Upper Heat Shield Bolt (6.6L)

10 N.m

89 lb in

2008 Chevrolet Silverado 1500

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

Review the Exhaust System Description and Operation in order to familiarize yourself with
the system functions. Refer to Exhaust System Description.

All diagnostics on a vehicle should follow a logical process. Strategy Based Diagnostics is a
uniform approach for repairing all systems. The diagnostic flow is the place to start when
repairs are necessary and may always be used in order to resolve a system problem. For a
detailed explanation, refer to Strategy Based Diagnosis .

Visual/Physical Inspection

Inspect for aftermarket or non-OEM devices such as, but not limited too; tailpipe
extensions, headers, and exhaust cutouts. This could affect the operation and proper
performance of the exhaust system.

Verify the exact operating conditions under which the concern exists. Note factors such as
engine RPM, engine temperature, engine load, and frequency of concern.

Inspect the easily accessible or visible system components for obvious damage or conditions
which could cause any symptom.

Intermittent

Test the vehicle under the same conditions that the customer reported in order to verify the system
is operating as designed.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the
symptom:

Loss of power. Refer to Restricted Exhaust.

Poor acceleration. Refer to Restricted Exhaust.

Poor fuel economy. Refer to Restricted Exhaust.

Exhaust hissing noise. Refer to Exhaust Leakage.

Exhaust popping noise. Refer to Exhaust Leakage.

Exhaust rattle noise. Refer to Exhaust Noise.

Loud exhaust noise. Refer to Exhaust Noise.

Exhaust buzz, groan, hum noise. Refer to Exhaust Noise.

RESTRICTED EXHAUST

Diagnostic Aids

2008 Chevrolet Silverado 1500

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