Intake Manifold Cleaning and Inspection - Lower

Tools Required 

J 21882  Oil Suction Pipe Installer

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

   Courtesy of GENERAL MOTORS CORP.
2. Remove the intake manifold coolant pipe bolt, if required.
3. Remove the intake manifold coolant pipe, if required.
   Fig 2: Removing Intake Manifold Coolant Pipe And Bolt

   Courtesy of GENERAL MOTORS CORP.

   Important:  Use GM P/N 12346139 (Canadian P/N 10953463) or equivalent to clean the intake manifold mating surfaces.

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.

   Repair or replace the intake manifold as necessary.

   Fig 3: Inspecting Intake Manifold

   Courtesy of GENERAL MOTORS CORP.
8. Apply sealant GM P/N 12345493 (Canadian P/N 10953488) to the end of a new intake manifold coolant pipe.
9. Install the intake manifold coolant pipe using the J 21882. 
   NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
10. 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 And Bolt

    Courtesy of GENERAL MOTORS CORP.
11. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads of the engine coolant temperature sensor.
12. Install the engine coolant temperature sensor.

    Tighten 

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

    Fig 5: Installing Engine Coolant Temperature Sensor

    Courtesy of GENERAL MOTORS CORP.