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Old 11-11-2009, 01:18 PM   #1
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Default Bad Catalytic Converter?

Hello everyone,

I have an issue with my 2000 SE that I'm at wits end trying to solve. About a week ago I was driving home from work when I noticed a rough idle at a stop light. As I neared home the engine began to chug and buck when I would give it gas. Over the next couple of days the symptoms became more pronounced, and the engine has now taken to dying after it is warm when accelerating from a stop.

My father and I hooked the car to the scanner and NO codes were present. The only thing that was of interest is the O2 sensors were not adjusting from rich to lean very quickly. We also noticed a faint smell of rotten eggs after taking the car out on a diagnostic drive.

We are now leaning toward a bad Cat, but is there anything else that it could be, especially with no codes present, and no misfires being recorded?

Thanks in advance for your thoughts and insight.
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Old 11-11-2009, 01:41 PM   #2
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Sounds like a bad cat to me. Try taking the O2 sensor out and starting the engine. If the cat is clogged the gases will come out the O2 sensor hole.
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Old 11-11-2009, 03:56 PM   #3
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OK, next question, do the converters on our cars bolt on, or is it a totally welded system?
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Old 11-11-2009, 04:34 PM   #4
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Most likely it'* welded on. You can get a after market one for under $100 and then have a shop weld it in. That'* what many of us have done.
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Old 11-11-2009, 06:54 PM   #5
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3" Goerlich Catalytic Converter OBDII 608227 - 608227
here ya go use this one or you'll probably get the engine light
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Old 11-11-2009, 08:41 PM   #6
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Quote:
Originally Posted by Danthurs View Post
Sounds like a bad cat to me. Try taking the O2 sensor out and starting the engine. If the cat is clogged the gases will come out the O2 sensor hole.
X2.... Be careful with going for aftermarket CAT'*, especially Hi-Flows. Saw recommended a Hi Flow Cat that so far doesn't throw a DTC and SES light. That'* te one I'm running with and I had it welded in place.
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Old 11-12-2009, 09:42 AM   #7
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How old are your O2 sensors? They should be doing the diagnostics on your cat.
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