Inspection Procedure

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

Inspect the intake manifold for the following conditions:
- Damage to the fuel rail mounting tabs (1)
- Damage, debris or restrictions to the MAP sensor mounting port (2)
- Damage, debris or restrictions to the brake vacuum booster hose port (3)
- Damage to the throttle body/throttle body adapter heater plate fastener inserts (4)
- Damage to the EGR pipe fastener inserts (5)
- Damage, debris or restrictions to the PCV system hose ports (6)
Fig 1: Checking Intake Manifold (1 Of 4)
Courtesy of GENERAL MOTORS CORP.
Inspect the intake manifold for the following conditions:
- Damage to the intake manifold bolt bosses (1)
- Damage to the EVAP purge solenoid fastener insert (2)
- Damage, debris or restrictions to the EVAP purge solenoid port (3)
- Damage, debris or restrictions in the vacuum passage (4)
Fig 2: Checking Intake Manifold (2 Of 4)
Courtesy of GENERAL MOTORS CORP.
Inspect the intake manifold for the following conditions:
- Damage to the pressure relief valve mounting bosses (1)
- Damage, debris or restrictions to the pressure relief valve port (2)
- Damage to the pressure relief valve components (3)
Fig 3: Checking Intake Manifold (3 Of 4)
Courtesy of GENERAL MOTORS CORP.
Inspect the intake manifold for the following conditions:
- Gouges or damage to the intake manifold sealing groove (1)
- Damage to the gasket sealing surface for the throttle body adapter heater plate (2)
- Damage to the fuel injector ports (3)
Fig 4: Checking Intake Manifold (4 Of 4)
Courtesy of GENERAL MOTORS CORP.
Inspect the throttle body adapter heater plate for the following conditions:
- Damage to the gasket sealing surface for the intake manifold and the throttle body (1)
- Damage, corrosion or restriction to the vacuum passage (2)
- Damage, corrosion or restriction to the engine coolant passage (3)
- Damage, corrosion or restrictions to the engine coolant inlet (4) and outlet (5) pipes
- Damage to the bolt holes (6)
- Damage to the throttle body adapter heater plate fasteners (7)

Fig 5: Checking Throttle Body Adapter Heater Plate

Courtesy of GENERAL MOTORS CORP.

Inspect the intake manifold cylinder head deck for warpage.
1. 6.1. Locate a straight edge across the intake manifold cylinder head deck surface.
2. 6.2. Insert a feeler gage between the intake manifold and the straight edge.
  An intake manifold with warpage in excess of 0.5 mm (0.020 in) must be replaced.
Repair or replace the intake manifold and/or throttle body adapter heater plate as necessary.