Intake manifolds are removed by dropping the fuel pressure and also removing the air filter housing, disconnecting the cable from the negative battery terminal and drain the cooling system coalesced. Remove the heater hose clamps and set the hoses to the side, take off the EGA module vacuum hose and connector and also, remove the EGA pipe. After that, remove the MAF sensor connector, the ECT sensor harness connector, the IGN 2 heater connector, the A/C Idle command harness connector and the connector to the electronic throttle body, and the EVAP line from the upper intake manifold and the FRPT sensor harness connector and the fuel injection harness connectors. Remove the vacuum hose connector and brake booster vacuum hose from the back of the upper intake manifold, and relieve the PCV pressure by removing the PCV hoses, and the PCV valve brackets from the valve covers. Lose the upper intake manifold mounting bolts and cover the air intake ports with the shop towel. For the lower intake manifold, the IMRC connector should be disconnected, the fuel rail then the upper radiator hose, and the bypass hose then, the lower intake manifold should be unbolted by turning the bolts in a 1/4 turn until they can be unscrewed. Where there is a problem with the intake manifold, use prybar to separate the gasket, after ensuring that all bolts creating the vacuum have been unscrewed. During installation clean the mating surfaces with gasket scraper and cleaning solvents if they are required. Cleaning up through the hole of the bolt and also clearing any debris, endeavor to follow the threads and examine the gasket surfaces. While making the construction, use the RTV sealant to spread on the block surface and put the rubber seals and side gaskets in its rightful place. Place the manifold properly in its right position when the sealant is wet, so that the gaskets are not shifted off. Liberal coat the manifold bolts with oil then install them and subsequently tighten the bolts until the recommended torque is achieved in the right sequence. As for the upper intake manifold, it is necessary to replace gasket seals, put the upper intake manifold in the place of the lower intake manifold, fasten the bolts. Last but not the least, refill the cooling system and turn on the engine and look for at the intake manifold joints if there are oil and coolant leakages.
