Intake Manifold Cleaning and Inspection - Lower

Tools Required 

J 21882  Oil Suction Pipe Installer

1. Remove the engine coolant temperature sensor.
   Fig 1: Engine Coolant Temperature Sensor

   Courtesy of GENERAL MOTORS CORP.
2. Remove the intake manifold coolant pipe bolt.
3. Remove the intake manifold coolant pipe.
   Fig 2: Intake Manifold Coolant Pipe

   Courtesy of GENERAL MOTORS CORP.
4. Clean the intake manifold gasket mating surfaces.
5. Clean the fuel injector bores.
6. Inspect the threaded holes for damage.
7. Inspect the intake manifold mating surfaces for damage.
8. Repair or replace the intake manifold as necessary.
   Fig 3: Inspecting Lower Intake Manifold

   Courtesy of GENERAL MOTORS CORP.
9. Apply sealant GM P/N United States 12345493, GM P/N Canada 10953488 or equivalent to the end of a new intake manifold coolant pipe.
10. Install the intake manifold coolant pipe using the J 21882  .
    NOTE: Refer to FASTENER NOTICE .
11. Install the intake manifold coolant pipe bolt.

    Tighten 

    Tighten the intake manifold coolant pipe bolt to 10 N.m (89 lb in).

    Fig 4: Installing Intake Manifold Coolant Pipe

    Courtesy of GENERAL MOTORS CORP.
12. Install the engine coolant temperature sensor. Apply sealer GM P/N United States 12346004, GM P/N Canada 10953480 or equivalent to the coolant temperature sensor.

    Tighten 

    Tighten the engine coolant temperature sensor to 23 N.m (17 lb ft).

    Fig 5: Engine Coolant Temperature Sensor

    Courtesy of GENERAL MOTORS CORP.