GM 12608305
Intake Manifold

To replace the Intake Manifold start by removing the air inlet duct as well as resonator, disconnect the iac (Idle Air Control) electrical connector, tps (Throttle Position Sensor) electrical connector, map (Manifold Absolute Pressure) sensor electrical connector, evap hose; pcv (Positive Crankcase Ventilation) hose purge solenoid, and the brake booster hose. Next, it is necessary to remove the oil indicator tube bolt, disengage the accelerator and cruise control cables from each other, as well as the Throttle Body and Fuel Rail. Remove the Knock Sensor connector from the Intake Manifold, disengage the nuts and bolts from the Intake Manifold, remove the Intake Manifold and you are left with the Intake Manifold. If needed, then remove the Intake Manifold Gasket which can be used if not damaged. For installation, if gasket was removed, install it first and slide the Intake Manifold back, then use nuts and bolts to fixed it with the torque of 10 nm (89 inch-lbs). Connect the Knock Sensor wire, fuel rail, and Throttle Body before the iac, tps, and MAP Sensor electric hookup and the former evap hose, pcv hose, purge solenoid tube, and brake booster hose. At long last, replace the oil level indicator tube bolt and bring the accelerator and cruise control cables into connection before fitting back the air inlet duct and resonator.

The process starts with air cleaner outlet resonator removal followed by Throttle Body extraction and complete removal of pcv hose and purge solenoid tube and brake booster hose along with oil level indicator tube bolt. After the Fuel Rail removal please disconnect the knock sensor electrical connector and separate the knock sensor harness connector from the Intake Manifold. Drink the Intake Manifold nuts and bolts before removing the manifold. You can keep the Intake Manifold Gasket for re-use unless you detect any damage. During the installation process first place the Intake Manifold Gasket on and then set the Intake Manifold into position. First install Intake Manifold nuts with bolts which require a torque setting of 10 nm (89 inch lbs.) before attaching the knock sensor harness connector and the knock sensor electrical connector. Connect the Fuel Rail followed by the Throttle Body then install the oil level indicator tube bolt and tighten the bolt to 10 nm (89 inch lbs.). You should finish your repair work by connecting the brake booster hose together with the purge solenoid tube and pcv hose before putting back the Throttle Body and air cleaner outlet resonator.

If necessary, remove the intake manifold gasket, which can be reused if undamaged.

Raise the vehicle again and reconnect the evap purge solenoid, camshaft sensor, crankshaft sensor, VSS, knock sensor, back-up lamp switch, oxygen sensor, and oil pressure switch.

Install the oil level indicator tube bolt and reconnect the accelerator and cruise control cables before reinstalling the air inlet duct and resonator.

Disconnect the evaporative emission (EVAP) canister purge tube from the intake manifold and the EVAP solenoid.

Yes, the intake manifold gasket is reusable; replace it only if damaged.

Disconnect the negative battery cable and remove the vacuum hoses from the EVAP canister purge valve, manifold vacuum source, brake booster, and heater and A/C source.

Remove the oil level indicator tube and the fuel rail.

Take out the fuel rail, disconnect the knock sensor electrical connector, and remove the knock sensor harness connector from the intake manifold.