Nissan 14001-ET80A Manifold-Intake

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On 2.5L engines, relieve the fuel system pressure. Remove the engine cover fasteners and take off the cover from the top of the engine. Detach the air inlet duct from the throttle body and air filter housing. Disconnect the cable from the negative terminal of the battery. Label and detach the PCV hose, brake booster hose, throttle control actuator, EVAP hose, and the purge control solenoid. Clamp off and disconnect the coolant hoses connected to the throttle body, then remove the throttle body and gasket. For the 2.0L engine, take out the intake manifold support bracket fasteners on each end of the manifold and remove the brackets. Remove the engine oil dipstick and cover the tube to prevent debris from entering. For the 2.5L engine, remove the battery tray, coolant reservoir, and disconnect the MAF sensor electrical connector. Remove the intake manifold support bracket fasteners and the bracket, then take off the cowl panel. Disconnect the injector rail fuel line quick-disconnect connector; it may be necessary to remove the fuel injectors and fuel rail to access the mounting bolts. Remove the front and rear intake manifold support bracket fasteners and brackets. Remove the intake manifold mounting nuts and bolts in reverse order of tightening, then take off the intake manifold from the cylinder head, ensuring to remove the intake manifold adapter on 2.5L engines after the manifold is removed. For installation, use a scraper to eliminate all old gasket material and sealant from the manifold and cylinder head, then clean the mating surfaces with brake system cleaner. Install a new gasket, position the intake manifold adapter on the cylinder head studs, then install another new gasket and position the intake manifold on the adapter, securing it with nuts/bolts. Tighten the nuts/bolts in sequence to the specified torque, then re-torque bolt number one. The remainder of the installation follows the reverse order of removal. Reconnect the battery and perform the necessary re-learn procedures.