Mercury 8L8Z-5G232-AA Exhaust Manifold Assembly

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Remove the EGR pipe, alternator, and oxygen sensor.

a) Connect a vacuum gauge to an intake manifold vacuum source. b) Warm the engine to operating temperature, place the transaxle in Park (automatic models) or Neutral (manual models), and apply the parking brake. c) Note the vacuum reading at idle and jot it down. d) Quickly open the throttle to near its wide-open position and then quickly get off the throttle and allow it to close. Note the vacuum reading and jot it down. e) Repeat this test three more times, recording your measurement after each test. f) If your fourth reading is more than one in-Hg lower than the reading noted at idle, the exhaust system might be restricted, indicating that the catalytic converter could be plugged, or an exhaust pipe or muffler could be restricted.

Coat the threads of the exhaust manifold bolts and studs with an anti-seize compound, then install a new gasket.

Remove the exhaust crossover pipe and the drive belt.

a) Connect a vacuum gauge to an intake manifold vacuum source. b) Warm the engine to operating temperature, place the transaxle in Park (automatic models) or Neutral (manual models), and apply the parking brake. c) Note the vacuum reading at idle and jot it down. d) Quickly open the throttle to near its wide-open position and then quickly get off the throttle and allow it to close. Note the vacuum reading and jot it down. e) Repeat this test three more times, recording your measurement after each test. f) If your fourth reading is more than one in-Hg lower than the reading noted at idle, the exhaust system might be restricted, indicating that the catalytic converter could be plugged, or an exhaust pipe or muffler could be restricted.

Coat the threads of the exhaust manifold bolts and studs with an anti-seize compound, then install a new gasket.