To remove the intake manifold, one has to relieve the fuel system pressure and then separate the cable from the negative terminal of the vehicle's battery. Eliminate the PCV hose joined at the back of the intake manifold, as well as the intake air connector and the throttle body; most significantly; it is necessary to clamp off the hoses to avoid leakage of the coolant. Remove vacuum hoses and dipstick tube from the intake manifold and subsequent to this, the fuel rail and injectors. Disconnect all other interfering items such as wiring harness and the heater hose from the manifold and then, unscrew the heater hose bracket at the rear portion of the manifold and then, the coolant hose from the clip at the back of the intake manifold. Last of all, unscrew the bolts holding the intake manifold to the engine block and pull off the manifold off the
Cylinder Head. On this point, it is required to remove the old gasket and clean the mating surfaces of the intake manifold and the cylinder head; afterwards, you need to install a new gasket on the intake manifold and put it onto the cylinder head and tighten the bolts and nuts. This is done in three progression with equal steps to those torque values given to prevent the warping of nuts and bolts. Fit the rest of the parts back, start the engine and look for any sign of leakage and take it for a road test to confirm its functionality.