LEMON Manuals: Even more car manuals for everyone
Home >> Cadillac >> 2004 >> CTS Base, 3.2 N >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Engine Mechanical - 3.6L (Ly7) (Repair Procedures -- 3 Of 5)) >> Off-Vehicle Repair Instructions - Part 2 >> Intake Manifold Cleaning and Inspection >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different variant/trim than selected.
    Fig 1: Identifying Upper Intake Manifold
    GM1211094Courtesy of GENERAL MOTORS CORP.
  1. Inspect the upper intake manifold for the following conditions:
    • Damage, debris or restrictions to the BARO sensor mounting port
    • Damage, debris or restrictions to the brake vacuum booster hose port
    • Damage to the throttle body bolt holes
    • Damage, debris or restrictions to the PCV system hose ports
    2. Fig 2: Identifying Upper Intake Manifold
    GM1211098Courtesy of GENERAL MOTORS CORP.
  2. Inspect the upper intake manifold for the following conditions:
    • Damage to the intake manifold bolt bosses
    • Damage to the EVAP purge solenoid mounting boss
    • Damage, debris or restrictions to the EVAP purge solenoid port
    • Damage, debris or restrictions in the vacuum passage
    3. Fig 3: Identifying Communicator Valve
    GM1211101Courtesy of GENERAL MOTORS CORP.
  3. Inspect the upper intake manifold for the following conditions:
    • Damage to the communicator valve mounting bosses
    • Damage, debris or restrictions to the communicator valve port
    • Damage to the communicator valve components
    4. Fig 4: Identifying Gasket Sealing Surfaces
    GM1211103Courtesy of GENERAL MOTORS CORP.
  4. Inspect the upper intake manifold for the following conditions:
    • Gouges or damage to the upper intake manifold sealing surfaces
    • Damage to the gasket sealing surface for the throttle body
    5. Fig 5: Checking Upper Intake Manifold For Warpage
    GM1211106Courtesy of GENERAL MOTORS CORP.
  5. Inspect the upper intake manifold sealing surface for warpage.
    1. Locate a straight edge across the upper-to-lower intake manifold sealing surface.
    2. Insert a feeler gage between the upper intake manifold and the straight edge. An upper intake manifold with warpage in excess of 0.05 mm (0.020 in) must be replaced.
  6. Repair or replace the upper intake manifold as necessary.


    Fig 1: Checking Lower Intake Manifold
    GM1211107Courtesy of GENERAL MOTORS CORP.
  1. Inspect the lower intake manifold for the following conditions:
    • Damage, debris or restrictions to the lower intake manifold ports
    • Damage to the fuel rail mounting bolt holes
    • Damage to the fuel rail
    2. Fig 2: Identifying Lower Intake Manifold Sealing Surfaces
    GM1211110Courtesy of GENERAL MOTORS CORP.
  2. Inspect the lower intake manifold for the following conditions:
    • Gouges or damage to the intake manifold sealing surfaces
    • Damage to the lower intake manifold bolt bosses
    • Damage to the fuel injector ports
    3. Fig 3: Checking Lower Intake Manifold Sealing Surfaces For Warpage
    GM1211113Courtesy of GENERAL MOTORS CORP.
  3. Inspect the lower intake manifold sealing surfaces for warpage.
    1. Locate a straight edge across the lower intake manifold sealing surfaces.
    2. Insert a feeler gage between the lower intake manifold and the straight edge. A lower intake manifold with warpage in excess of 0.5 mm (0.020 in) must be replaced.
  4. Repair or replace the lower intake manifold as necessary.
scientia non olet · About LEMON Manuals