Mopar 4591862AG Intake Manifold Plenum

To remove the upper intake manifold, start by relieving the fuel pressure and disconnecting the battery. Then, remove the air intake duct and filter housing.

Remove the fuel rails and injectors.

To remove the lower intake manifold, drain the cooling system and remove the upper intake manifold. Label and detach any remaining hoses and remove the fuel rail and injectors. Remove the heater hoses and coolant hoses. Loosen the remaining manifold mounting bolts/nuts and carefully break the gasket seal. Turn the manifold over, replace the O-ring on the heater supply tube, and remove all traces of old gasket material and sealant. Clean the mating surfaces with lacquer thinner or acetone. Apply RTV sealant around the front and rear cylinder head water passages and lay the new gaskets in place. Position the manifold on the engine, aligning the gaskets and manifold with the ports in the cylinder heads. Install the fuel rail and injectors, then tighten the nuts/bolts. Refill the cooling system, run the engine, and check for leaks.

Starting with the outer bolts and working to the inner bolts, loosen the intake manifold bolts in 1/4-turn increments until they can be removed by hand. Follow the reverse of the tightening sequence.