Removal Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Engine Harness Electrical Connectors & Inlet Hose Clamp

Courtesy of GENERAL MOTORS COMPANY

Remove the intake manifold. Refer to Intake Manifold Replacement (RPOs LC9, LMG, LY5, L76) , Intake Manifold Replacement (RPOs LY2, LY6) , Intake Manifold Replacement (Except RPOs LY2, LY6, LC9, LMG, LY5) .
Disconnect the engine harness electrical connector (1) from the oil pressure sensor.

Fig 2: Valve Lifter Oil Manifold

Courtesy of GENERAL MOTORS COMPANY

DO NOT lift the valve lifter oil manifold by the electrical lead frame.

Fig 3: Valve Lifter Oil Manifold

Courtesy of GENERAL MOTORS COMPANY

Remove the valve lifter oil manifold bolts (2).
Remove the valve lifter oil manifold (1).

Fig 4: Gasket Retaining Strap Locations

Courtesy of GENERAL MOTORS COMPANY

NOTE:

Remove only the outer gasket from the manifold. Do not disassemble any of the internal components of the manifold in an attempt to remove the 8 inner sealing gaskets. If the inner gaskets are cut or damaged, replace the manifold as an assembly. Only use a wire-cutter type tool in order to minimize the amount of debris. Do not use a rotary-type cutting tool on the retaining straps.

Identify the 8 gasket retaining strap locations (1-8).

Fig 5: Retaining Strap

Courtesy of GENERAL MOTORS COMPANY

Using a cutter type tool, cut the 8 retaining straps.

Fig 6: Identifying Valve Cover Outer Gasket

Courtesy of GENERAL MOTORS COMPANY

Remove the outer gasket (1) from the valve lifter oil manifold.