Genuine Nissan Intake Manifold

Nissan Pathfinder Intake Manifold Parts Questions & Experts Answers

• Q: How to remove the upper intake plenum, lower intake plenum, and intake manifold on 3.5L V6 Nissan Pathfinder?

  A: To remove the upper intake plenum, start by relieving the fuel pressure and disconnecting the battery. Then, remove the air intake duct and engine cover. Label and disconnect the hoses and electrical connectors attached to the plenum and throttle body. Loosen the upper intake plenum bolts in reverse order and remove the plenum with the throttle body attached. To install the upper plenum, clean the mounting surfaces and remove any old gasket material. Install new gaskets and position the upper plenum onto the lower plenum, tightening the bolts in the recommended sequence. The lower intake plenum can be removed, including removing the upper intake plenum, labeling and disconnecting hoses and electrical connectors, and removing the plenum support brackets. Clean the mounting surfaces and install new gaskets before positioning the lower plenum onto the intake manifold and tightening the bolts. To remove the intake manifold, start by removing the upper and lower intake plenum. Label and detach any remaining hoses, then remove the fuel rail and injectors. Loosen the manifold mounting bolts/nuts in reverse order and carefully use a scraper to remove old gasket material. Clean the mating surfaces and install new gaskets before positioning the lower manifold on the engine and tightening the nuts in the recommended sequence. Finally, run the engine and check for any leaks.
• Q: How to remove and reinstall an intake manifold on 2.4L four cylinder Nissan Pathfinder?

  A: Relieve the fuel system pressure and disconnect the cable from the negative terminal of the battery. Drain the cooling system, remove the power steering pump and set it aside without disconnecting the fluid lines. Remove the throttle body, the fuel rail and the fuel injectors. Label and detach all wire harnesses, control cables, coolant and vacuum hoses connected to the intake manifold. Also disconnect the EGR pipes from the EGR valve. Working underneath the vehicle, unbolt the lower brace from the intake manifold. Remove the mounting nuts/bolts, then detach the manifold from the engine. Use a scraper to remove all traces of old gasket material and sealant from the manifold and Cylinder Head, then clean the mating surfaces with lacquer thinner or acetone. Install a new gasket, then position the manifold on the cylinder head and install the nuts/bolts. Tighten the nuts/bolts in three or four equal steps to the specific torque. Follow the recommended tightening sequence. Install the remaining parts in the reverse order of removal. Refill the cooling system. Before starting the engine, check the throttle linkage for smooth operation. Run the engine and check for coolant and vacuum leaks. Road test the vehicle and check for proper operation of all accessories.
• Q: How to remove the upper and lower intake manifold on 3.3L V6 Nissan Pathfinder?

  A: To remove the upper intake manifold (plenum), begin by disconnecting the negative battery cable and removing the air intake duct. Disconnect the accelerator cable, cruise control cable (if applicable), hoses, and electrical connectors from the throttle body, and remove the spark plug wires and distributor cap. Label and disconnect hoses and electrical connectors, then remove the ground strap and loosen the upper intake manifold bolts in reverse order. Remove the upper plenum with the throttle body attached. To install the upper manifold, clean the mounting surfaces, install a new gasket, and tighten the bolts to the specified torque. Reconnect hoses and electrical connectors, and refill the coolant if needed. For the lower intake manifold, first relieve fuel pressure and disconnect the negative battery cable. Remove the upper intake manifold. Drain the cooling system, disconnect electrical connectors, remove the radiator hose from the thermostat housing, and label and detach vacuum hoses. Remove the fuel rail and injectors, then disconnect coolant pipes at the transmission end of the intake manifold. Loosen the manifold mounting bolts/nuts incrementally, then carefully use a scraper to remove old gasket material and clean the mating surfaces. Install new gaskets, position the lower manifold, and tighten the nuts/bolts in a specified sequence to the recommended torque. Complete the installation by refilling the cooling system, changing the engine oil, and checking for fuel, vacuum, and coolant leaks.