59. Intake Manifold Clean and Inspect - Lower

- Tools Required
- J21882 Oil Suction Pipe Installer





1. Remove the engine coolant temperature sensor,





2. Remove the intake manifold coolant pipe bolt.
3. Remove the intake manifold coolant pipe.





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.





8. Apply sealant GM P/N 12345493 to the end of a new intake manifold coolant pipe.
9. Install the intake manifold coolant pipe using the J21882.

Notice: Refer to Fastener Notice in Service Precautions.

10. Install the intake manifold coolant pipe bolt.
Tighten the intake manifold coolant pipe bolt to 10 Nm (89 inch lbs.).





11. Apply sealant GM P/N 12346004 or equivalent to the threads of the engine coolant temperature sensor.
12. Install the engine coolant temperature sensor.
Tighten the engine coolant temperature sensor to 23 Nm (17 ft. lbs.).