OEM 2008 Lincoln Navigator Intake Manifold

2008 Lincoln Navigator Intake Manifold Parts Questions & Experts Answers

• Q: How to remove and replace the intake manifold on 2008 Lincoln Navigator?

  A: The first step for intake manifold replacement involves draining coolants from the cooling system while also disconnecting the ground cable from the battery. You should remove fuel system pressure before you disconnect the spring lock fuel supply hose from the fuel rail to avoid fuel spraying. Begin the replacement process by taking out the generator then the air cleaner outlet pipe and then detach the crankcase ventilation tube quick connect coupling and the evaporative emissions system (EVAP) hose from the intake manifold. The air cleaner outlet pipe-to-throttle body adapter requires removal of its 4 bolts before disconnecting the upper radiator and heater coolant hoses from the engine coolant crossover assembly. The first step includes removing the PCV tube while also disconnecting 8 fuel injector and ignition coil electrical connectors together with the throttle position sensor and heated PCV intake fitting electrical connectors. The engine shop performs the following tasks to replace the intake manifold vacuum tube support bracket bolt and disconnect the brake booster vacuum hose. The ten intake manifold bolts must be removed before cleaning the sealing surfaces using a scraping tool and silicone gasket remover which requires disposal of the old gaskets. The installation process requires vacuum and electrical harnesses which must not limit the movement range of the charge motion control valve (CMCV) control rods. Affix the new intake manifold onto its location while using new gaskets before installing the engine coolant crossover assembly with 3 bolts tightened up to 10 Nm (89 lb-in). Complete the connection process of the engine wiring harness retainer and the CMCV electrical connector and the cylinder head temperature sensor jumper harness and the knock sensor connectors. The installation of intake manifold bolts requires two-stage tightening to begin with 2 Nm then progress to 10 Nm. Reattach the combination of intake manifold vacuum tube support bracket and brake booster vacuum hose together with heated PCV intake fitting and throttle position sensor and fuel injector and ignition coil electrical connectors. Reattach the air cleaner outlet pipe-to-throttle body adapter followed by putting back the crankcase ventilation tube and EVAP hose and PCV tube before connecting upper radiator and heater coolant hoses. The last step of the repair involves reconnecting the fuel supply spring lock coupling followed by generator and air cleaner outlet pipe reinstallation and battery ground cable and engine cooling system filling with correct bleeding procedures.