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How long should a Catalytic Converter Last? 200 1991

posted by  plopswagon on  Wed Dec 30 03:26 CST 2009
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last visit: Fri Sep 20 10:21 CST 2013
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I replaced mine last year and I again failed the inspection. I am sure that it is an indicator of other problems but the inspection guy seems to believe that older cars need them replaced every year or two.








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    How long should a Catalytic Converter Last? 200 1991

    posted by  Farm Boy on  Wed Dec 30 18:51 CST 2009
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    last visit: Mon Oct 28 07:35 CST 2013
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    You are correct. It is an indication of other problems.

    My '91 has 285k miles on the original cat and and recently passed California emission inspection easily.








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    How long should a Catalytic Converter Last? 200 1991

    posted by  david hunter on  Wed Dec 30 06:30 CST 2009
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    last visit: Mon Jun 30 22:10 CST 2014
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    Is the inspection guy selling them? He is incorrect.

    They can last forever if the car is maintained properly. Long time running rich will soot it up, it is then useless.
    The definition of a catalyst is that it changes or speeds up a chemical reaction without undergoing a change itself.
    --
    David Hunter








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    How long should a Catalytic Converter Last? 200 1991

    posted by  plopswagon on  Wed Dec 30 06:01 CST 2009
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    okay, so its definitely running rich. I goes we'll start that route...








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      How long should a Catalytic Converter Last? 200 1991

      posted by  Smitty on  Wed Dec 30 17:28 CST 2009
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      last visit: Sat Aug 9 22:44 CST 2014
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      Well, the guy might be right, if the "old cars" are burning lots of oil and running super rich - those conditions will fubar a cat before long.

      Start with the usual places - fuel pressure regulator, make sure ignition's in good shape, then check the oxygen sensor. Any codes set?

      A real long shot (so don't go here first) is an odd condition where a cracked exhaust downpipe ended up sucking in air upstream of the oxygen sensor, tricking it into seeing a lean condition that didn't really exist. The ECU over-compensated by creating a rich mixture.







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