Intake Manifold Cleaning and Inspection - Lower

Tools Required 

J 21882  Oil Suction Pipe Installer. See Special Tools .

Fig 1: Engine Coolant Temperature Sensor
Courtesy of GENERAL MOTORS CORP.
1. Remove the engine coolant temperature sensor.
Fig 2: Identifying Intake Manifold Coolant Pipe
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 3: Inspecting Intake Manifold
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 4: Installing Intake Manifold Coolant Pipe Using J 21882
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  . See Special Tools .
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 5: Engine Coolant Temperature Sensor
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).