Oldsmobile 12608305 Intake Manifold Assembly

Before that intake manifold can be removed, the negative cable on the battery must be disconnected. Then, you should turn the intake air duct assembly and the throttle body around and pull them out, as for the PCM, you have to unbolt it and swivel it aside. Remove the fuel injector wire harness by booty clamp from the intake manifold and the wire harness from the MAP sensor. Lift the car off the ground and place it on jack-stands disconnecting the harness from the bottom of the intake manifold and lowering the car if necessary for easier access. First take out the dipstick tube mounting bolt and move the dipstick aside and then unbolt and take off the wiring bolt present in the lower part of the manifold and the EVAP purge tube. Any obvious vacuum hoses which may be connected to the manifold should be disconnected and the position remembered just in case their connection is needed later. It is necessary to withdraw the intake manifold, undoing the bolts and nuts on the manifold surface and on the engine block, to unfasten the brake vacuum hose, having pressed on the tab on it, and to lift the manifold out of the engine compartment. For uninstallation, the intake manifold gaskets have to be removed, and with more often use, they will require replacement; the surfaces of the manifold or the cylinder head should also be cleaned. Position the manifold over the studs on the cylinder head, screw in the bolts and nuts and tighten them just enough using your hands before actually using a torque wrench on the central bolts before proceeding to either side. The rest of the installation is the process reversed from removal. Last but not the least, join the battery and start the engine and look for the Vacuum, Coolant and fuel leaks.