To remove the intake manifold covers, first disengage the locking tab on the oil filler spout with a small screwdriver and rotate it counterclockwise to remove. Next, disconnect the brake booster vacuum hose and vacuum lines from the fittings, followed by the electrical connectors for the Camshaft Position (CMP) sensor and the left knock sensor. Remove the power steering fluid reservoir mounting bracket fasteners and set the reservoir and bracket aside. Disconnect the electrical connector and vacuum hose from the switching valve at the rear of the plenum, then lift and remove the intake manifold cover, with installation being the reverse of removal. For the right side, relieve the fuel system pressure, disconnect and remove the fuel lines to the fuel rail, and disconnect the quick-disconnect fitting to the EVAP hose. Disconnect the wiring harness fasteners mounting the harness to the Engine Control Module (ECM) bracket, disconnect the cable from the negative battery terminal, and remove the after run coolant pump-to-ECM mounting bracket fasteners, setting the pump aside. Disconnect and remove the ECM, then remove the ECM bracket mounting fasteners from the intake plenum and cylinder head before lifting and removing the intake manifold cover, with installation being the reverse of removal. For the upper intake manifold, first remove the intake manifold covers if equipped, relieve the fuel system pressure, disconnect the cable from the negative battery terminal, and remove the intake plenum. Disconnect and remove the fuel lines to the fuel rail, disconnect the quick-disconnect fitting to the EVAP hose, disconnect the fuel injector's electrical connectors from the main engine harness, and disconnect the vent tube from the fuel pressure regulator. If replacing the upper intake manifold, remove the fuel rail from the manifold. The intake manifold is secured with six bolts along its base; remove these bolts and pull the intake manifold and fuel rail away from the engine. When installing, use new manifold gaskets and tighten the bolts in several stages, working from the center out to the specified torque, with installation otherwise being the reverse of removal. For the lower intake manifold, first remove the upper intake manifold, then remove the lower intake manifold-to-cylinder head bolts and take the manifold off the cylinder heads. For installation, use new manifold gaskets and tighten the bolts in several stages, working from the center out to the specified torque, with installation otherwise being the reverse of removal.
