GM 24505921
Intake Manifold, Upper

You must start by draining engine coolant and disconnecting both the iat sensor electrical connection and upper Intake Manifold. Start by disconnecting the right side fuel injector electrical connectors from the fuel injectors and the manifold absolute pressure (MAP) sensor electrical connector . Next remove the air intake duct and the drive belt tensioner. Extract the engine harness vacuum tube from its space at the vacuum port while also extracting the fuel pressure regulator tube from the manifold vacuum source and the fuel pressure regulator valve . Remove both left side fuel injector connectors as well as the evaporative emission (EVAP) canister purge valve switch connector. Begin by releasing fuel pressure and removing both fuel lines from the Fuel Rail along with disconnecting the evap canister purge valve fuel vapor line. The first step is to disconnect the Ignition Control Module followed by relocating the brake booster hose clamp before disconnecting the brake booster hose through the upper Intake Manifold fitting. Disconnect the electronic throttle control (ETC) electrical connector and the mass airflow (MAF) sensor and engine coolant temperature (ECT) sensor electrical connectors. You must detach the Throttle Body engine harness clip while also removing the engine harness clamp bolt and harness clamp so you can place the engine wiring harness into position. Pull out the Thermostat Housing and disconnect the wiring harness clips from the Fuel Rail before moving the wiring harness aside. Use compressed air to clean away any dirt from the injector bores before removing the Fuel Rail from the upper Intake Manifold by removing its Fuel Rail nuts. You must first remove upper Intake Manifold bolts (1, 3, 4) before extracting the upper Intake Manifold with its matching upper Intake Manifold gasket . During cleaning operations inspect and tidy up the mating surfaces for upper and lower intake manifolds. Additionally clean away the manifold vacuum source screws and manifold vacuum source , the evap purge valve bolts and purge valve , the Throttle Body bolt , nuts , throttle body , and gasket . The lower Intake Manifold o-ring seals (3, 4) must be removed when needed. Installation of new lower Intake Manifold o-ring seals (3, 4) begins before positioning the upper Intake Manifold gasket and upper Intake Manifold onto the lower Intake Manifold. Tighten the 9 upper Intake Manifold bolts to 15 nm (11 ft. Lbs.), the 2 upper Intake Manifold bolts to 30 nm (22 ft. Lbs.)use 15 nm (11 ft. Lbs.) to tighten the upper Intake Manifold bolt. If the upper Intake Manifold was replaced, install the Throttle Body Gasket and Throttle Body , followed by the Throttle Body bolt and nuts , tightening the Throttle Body nuts to 10 nm (89 inch lbs.) secure the Throttle Body bolt by applying 10 nm torque (89 inch lbs.). Fasten the Fuel Rail to the upper Intake Manifold by tightening Fuel Rail nuts to a torque of 9 nm (80 inch lbs.). Fasten the wiring harness clips to both the Fuel Rail and the Thermostat Housing before repositioning the engine harness. Install the engine harness clamp and harness clamp bolt , tightening the harness clamp bolt to 6 nm (53 inch lbs.)install the engine harness clip to the Throttle Body after securing the engine harness clamp with the harness clamp bolt at 6 nm (53 inch lbs.). First connect the maf sensor's electrical connector then the ect sensor's electrical connector before connecting the etc electrical connector . Place the brake booster hose onto the upper Intake Manifold fitting then secure the brake booster hose clamp at its position. Set the Ignition Control Module in place and install the evap canister purge valve to the upper Intake Manifold using 10 nm (89 inch lbs.) torque. The fuel vapor line should be connected to the evap canister purge valve and the fuel lines should lead to the Fuel Rail. Install the evap canister purge valve electrical connector and left side fuel injector electrical connectors to their proper positions on the fuel injectors. The installation of the upper Intake Manifold requires you to secure the manifold vacuum source using 10 nm (89 inch lbs.) torque. Route the fuel pressure regulator tube to connect both the manifold vacuum source and fuel pressure regulator valve and route the engine harness vacuum tube to join the vacuum port and fit the MAP Sensor electrical connector and right side fuel injector electrical connectors to their respective fuel injectors. Spread out by reconnecting the iat sensor electrical connector followed by adding fresh engine coolant to the system. Last, position the drive belt tensioner and install the air intake duct.

Remove the coolant temperature sensor.

Connect the fuel vapor line to the EVAP canister purge valve, the fuel lines to the fuel rail, and the EVAP canister purge valve switch electrical connector.

Install the fuel vapor line to the EVAP canister purge valve and the fuel lines to the fuel rail, then connect the EVAP canister purge valve electrical connector and the left side fuel injector electrical connectors to the fuel injectors.