Upper Intake Manifold Replacement

Upper Intake Manifold Replacement

Removal Procedure




1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (L26) (Service and Repair).
2. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (Service and Repair).
3. Remove the air cleaner intake duct. Refer to Air Cleaner Inlet Duct Replacement (Service and Repair).
4. Drain the cooling system. Refer to Cooling System Draining and Filling (L26, LY7 GE 47716 Fill) (Service and Repair)Cooling System Draining and Filling (L26 Static Fill) (Service and Repair).
5. Remove the right spark plug wires from the ignition control module and the upper intake manifold and reposition the wires. Refer to Spark Plug Wire Replacement (Service and Repair).
6. Relieve the fuel pressure. Refer to Fuel Pressure Relief (Without CH 48027) (Fuel Pressure Relief (Without CH 48027))Fuel Pressure Relief (With CH 48027) (Fuel Pressure Relief (With CH 48027)).
7. Remove the brake booster hose (1) from the vacuum source manifold (2).
8. Disconnect the electrical connectors from the following:

* Electronic throttle control (ETC)
* Evaporative emission (EVAP) purge solenoid
* Manifold absolute pressure (MAP) sensor
* Mass air flow (MAF) sensor




9. Remove the exhaust gas recirculation (EGR) valve wiring harness heat shield nut (1), bolt (2) and the EGR heat shield (3).
10. Disconnect the EVAP purge solenoid pipe quick connect fitting. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement (Service and Repair).




11. Remove the fuel rail assembly nuts (2).
12. Remove the fuel rail assembly (1) with the fuel injectors (3).




13. Remove the upper intake manifold bolts (1, 4) and the studs (2, 3).
14. Clean the upper intake manifold bolt threads.
15. Remove the upper intake manifold.




16. Remove the upper-to-lower intake manifold carrier gasket from the upper intake manifold.
17. If the upper intake manifold is being replaced, remove the following:

* Throttle body
* MAP sensor
* Positive crankcase ventilation (PCV) valve
* Vacuum source manifold

Installation Procedure

1. If the manifold was replaced install the following:

* Vacuum source manifold
* PCV valve
* MAP sensor
* Throttle body




2. Install the upper-to-lower intake manifold carrier gasket to the upper intake manifold.




3. Carefully install the upper intake manifold (5) onto the lower intake manifold. Ensure that the alignment pins in the upper intake manifold align with the holes in the lower intake manifold.
4. Apply threadlock compound to the threads of the bolts (1, 4) and the studs (2, 3). Refer to Sealers, Adhesives, and Lubricants (Specifications) for the correct part number.





Notice: Refer to Fastener Notice (Fastener Notice).

5. Install the upper intake manifold bolts and the studs (1-10).

Tighten the bolts in sequence to 10 N.m (89 lb in).




6. Lightly coat the fuel injectors (3) with clean engine oil.

Important: Ensure the fuel rail is fully seated in the lower intake manifold assembly.


7. Install the fuel rail assembly (1) to the lower intake assembly.
8. Install the fuel rail nuts (2).

Tighten the nuts to 10 N.m (89 lb in).

9. Connect the EVAP purge solenoid pipe quick connect fitting. Refer to Evaporative Emission Canister Purge Solenoid Valve Replacement (Service and Repair).




10. Install the EGR valve wiring harness heat shield (3), the nut (1) and the bolt (2).

Tighten the nut and the bolt to 10 N.m (89 lb in).




11. Install the brake booster hose (1) to the vacuum source manifold (2).
12. Connect the electrical connectors to the following:

* MAF sensor
* MAP sensor
* EVAP purge solenoid
* ETC

13. Install the right spark plug wires to the ignition control module and the upper intake manifold. Refer to Spark Plug Wire Replacement (Service and Repair).
14. Install the air cleaner intake duct. Refer to Air Cleaner Inlet Duct Replacement (Service and Repair).
15. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (Service and Repair).
16. Fill the cooling system. Refer to Cooling System Draining and Filling (L26, LY7 GE 47716 Fill) (Service and Repair)Cooling System Draining and Filling (L26 Static Fill) (Service and Repair).
17. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (L26) (Service and Repair).
18. Inspect for fluid or vacuum leaks.