The following is the procedure to unbolt and replace the exhaust manifold; The vehicle should be turned off and the exhaust cooled down then remove the negative terminal of the battery. For 2.2L and 2.3L engines, lift the vehicle and remove the Oxygen Sensor connector, if necessary. Take off the exhaust manifold upper cover and any heat shields; also loosen the nuts joining the manifold to front exhaust pipe but note that the gasket is to be discarded. Sustain the pipe and loose the manifold bracket bolts; then, with equal spacing and crossing each other's path, remove manifold nuts. Scrub the mating surfaces and if possible fit the lower manifold housing before setting the manifold in place with a new gasket and nuts. Final, tighten the support bracket bolts together with the manifold nuts in the cross-wise pattern to make sure they are equally tight, after which, any heat insulators to be reinstated and finally the upper manifold cover. For 2.7L engines turn the negative battery terminal, drain the coolant and take off the
Radiator. Remove the starter cable and depending on the model perhaps the vacuum control box for space. Once the vehicle is RAISED, SIMPLY REMOVED the front wheels and splash shield, furiously disconnect the front Oxygen sensor and exhaust pipe. The heat shield bolts and EGR crossover pipe should be loosened; the manifold nuts should also be loosened. New gaskets and nuts must be placed and 'star-wedge-star' tight, then replace the EGR crossover pipe and heat shields. Screw the exhaust pipe back and connect the front Oxygen sensor and then fix the center beam, the splash shield and the front wheels. For the DL engine, lift the car, remove the engine tray and disconnect the exhaust at the manifold. Lower the vehicle, take off the heat shield and undo the manifold. Scrub the surfaces, place a fresh gasket and put the manifold in place, fastening the nuts and heat shield bolts then refit the exhaust pipe. Last of all, join the negative battery terminal and input the radio security code, and turn the ignition in order to look for any signs of leakage.