Mercury F8AZ-9424-AA Manifold Assembly - Inlet

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The remaining installation steps are the reverse of removal. Start the engine and check carefully for oil and coolant leaks at the intake manifold joints.

The manufacturer recommends the use of guide pins when installing the manifold. To make these, buy four extra manifold bolts. Cut the heads off the bolts, then grind a taper and cut a screwdriver slot in the cut ends.

Relieve fuel pressure, remove the air intake plenum assembly on 5.0L engines or the air intake assembly on 4.6L engines, and remove the fuel rail assembly. Detach the electrical connectors from the injectors, remove the injectors, inspect and replace injector O-rings and other components as needed. Lubricate new O-rings with oil before installation and twist to install the injectors. The remainder of the installation is the reverse of removal.

Start by disconnecting the negative battery cable. Following that, unplug electrical connectors at the air bypass valve, throttle position sensor, and EGR position sensor. Detach the accelerator cable and transmission linkage from the throttle body assembly, remove the accelerator cable/Throttle Valve (TV) cable bracket from the intake manifold, and label and detach vacuum lines from the upper intake manifold vacuum tree, EGR valve, and fuel pressure regulator.

The manufacturer recommends the use of guide pins when installing the manifold. To make these, buy four extra manifold bolts. Cut the heads off the bolts, then grind a taper and cut a screwdriver slot in the cut ends.

Remove the throttle body.