Chevrolet Silverado / GMC Sierra. Service manual — part 1823

7. Install the catalytic converter to exhaust manifold nuts (1).

Tighten: Tighten the nuts to 50 N.m (37 lb ft).

8. Install the HO2S. Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 1

(1500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series)
or Heated Oxygen Sensor Replacement - Bank 2 Sensor 1 (2500 Series -
Cab/Chassis) .

Fig. 119: View Of Catalytic Converter To Muffler Nuts
Courtesy of GENERAL MOTORS CORP.

9. If the vehicle is a 2500/3500 series, install the muffler to catalytic converter nuts.

Tighten: Tighten the nuts to 45 N.m (33 lb ft).

2008 Chevrolet Silverado 1500

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

Fig. 120: View Of Catalytic Converter To Muffler Nuts
Courtesy of GENERAL MOTORS CORP.

10. If the vehicle is a 1500 series, install the catalytic converter to muffler nuts.

Tighten: Tighten the nuts to 45 N.m (33 lb ft).

2008 Chevrolet Silverado 1500

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

Fig. 121: View Of Left Front HO2S Electrical Connector Clip & Engine Wiring
Harness Electrical Connector
Courtesy of GENERAL MOTORS CORP.

11. For vehicles equipped with a 4L60-E/4L70-E automatic transmission perform the following

steps, for vehicles equipped with a 6L80-E automatic transmission proceed to step 13.

12. Install the HO2S electrical connector clip (1) to the fuel line clip.

13. Connect the engine wiring harness electrical connector (2) to the HO2S.

14. Install the CPA retainer.

2008 Chevrolet Silverado 1500

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

Fig. 122: View Of Engine Wiring Harness Electrical Connector Clip & Electrical
Connector
Courtesy of GENERAL MOTORS CORP.

15. Connect the engine wiring harness electrical connector (3) to the HO2S.

16. Install the engine wiring harness electrical connector clip (1) to the fuel line clip.

17. Install the CPA retainer (2).

2008 Chevrolet Silverado 1500

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