How to Replace the Exhaust Manifold in a Mitsubishi Eclipse

Disconnect the negative cable on the battery. Locate the front heated oxygen sensor electrical connector and remove both the connector and the sensor.

Loosen the exhaust manifold cover retaining screws and remove them. Lift off the cover.

Remove the exhaust manifold bracket. Take off the lower heat shield. Apply penetrating oil to the exhaust manifold bolts and allow it to soak in for several minutes.

Remove the bolts that hold the exhaust manifold in place. Lift the exhaust manifold from the engine and discard the gasket.

Clean the mating surfaces to remove any gasket material, dirt and carbon deposits. Wipe the surfaces with solvent. Check for damage.

Set the new gasket on the mating surface of the cylinder heat. Install the exhaust manifold over the gasket.

Put the retaining bolts in place and finger-tighten them. Torque the bolts, working out from the center, in three passes to 33 to 39 foot pounds.

Install the remaining components in the reverse order of their removal. Reconnect the negative battery cable.

Start the engine and allow it to run for several minutes. Check for exhaust leaks and proper engine operation.