Ford 9L8Z-5E212-A Catalytic Converter Assembly

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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.

If you suspect that the converter on your vehicle is malfunctioning, take it to a dealer or authorized emission inspection facility for diagnosis and repair. The test equipment for a catalytic converter, such as a "loaded-mode" dynamometer and a 5-gas analyzer, is expensive.