CTS V6-3.2L VIN N (2003)
14. Remove the 2 bolts securing the engine control module (ECM) bracket to the intake plenum.
15. Remove the intake plenum bolt caps.
16. Remove the intake plenum bolts.
17. Lift the intake plenum from the intake manifold.
18. Remove the intake plenum O-ring seals.
19. Mask off the open ports to the intake manifold, in order to prevent foreign objects from entering the engine.
20. Disassemble the intake plenum if necessary. Refer to Intake Plenum Manifold Disassemble.
21. Clean and inspect the intake plenum. Refer to Intake Plenum Manifold Cleaning and Inspection.
Installation Procedure
1. Assemble the intake plenum if necessary. Refer to Intake Plenum Manifold Assemble.
2. Remove the masking from the intake plenum ports and ensure the sealing surfaces are clean and dry.
3. Lightly coat the intake plenum O-ring seals with clean engine oil and install to the intake manifold.
