1. Remove the engine wiring harness bracket nuts.
2. Remove the engine wiring harness bracket.



3. Remove the engine wiring harness clip bolt (4).



4. Disconnect the engine coolant temperature (ECT) sensor electrical connector.
5. Reposition the engine wiring harness and bracket.



6. Disconnect the power brake booster vacuum hose from the vacuum fitting (1).



7. Remove the positive crankcase ventilation (PCV) valve hose from the PCV valve cover and rocker arm cover.



8. Remove the valve rocker arm cover bolts.
9. Remove and discard the valve rocker arm cover bolt grommets.



10. Remove the valve rocker arm cover.



11. Remove and discard the valve rocker arm cover gasket.
12. Clean and inspect the valve rocker arm cover, if necessary. Refer to Valve Rocker Arm Cover Cleaning and Inspection in Engine Mechanical - 4.3L Unit Repair.

Important: Do not reuse the valve cover gasket or the valve rocker arm cover bolt grommets.

1. Install a NEW valve rocker arm cover gasket to the valve rocker arm cover.
2. Install NEW valve rocker arm cover bolt grommets to the valve rocker arm cover.



3. Install the valve rocker arm cover.




Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

4. Install the valve rocker arm cover bolts.

Tighten
Tighten the valve rocker arm cover bolts to 12 N·m (106 lb in).




5. Install the PCV valve hose to the PCV valve cover and rocker arm cover.



6. Connect the power brake booster vacuum hose to the vacuum fitting (1).



7. Position the engine wiring harness and bracket.
8. Connect the ECT sensor electrical connector.



9. Install the engine wiring harness clip bolt (4).

Tighten
Tighten the engine wiring harness clip bolt to 9 N·m (80 lb in).




10. Install the engine wiring harness bracket.
11. Install the engine wiring harness bracket nuts.

Tighten
Tighten the engine wiring harness bracket nuts to 12 N·m (106 lb in).