Toyota 17410-22410 Front Exhaust Pipe Assembly

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Although catalytic converters don't break often, they can become plugged. The easiest way to check for a restricted converter is to use a vacuum gauge to diagnose the effect of a blocked exhaust on intake vacuum.Steps to check for a restricted converter include: a) Connect a vacuum gauge to an intake manifold vacuum source. b) Warm the engine to operating temperature, place the transaxle in Park (automatic) or Neutral (manual), and apply the parking brake. c) Note and record the vacuum reading at idle. d) Quickly open the throttle to near full throttle and release it shut, then note and record the vacuum reading. e) Perform the test three more times, recording the reading after each test. f) If the reading after the fourth test is more than one in-Hg lower than the idle reading, the exhaust system may be restricted, indicating a plugged catalytic converter or a restriction in the exhaust pipe or muffler.