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Re: Bad Catalytic Converter
If you don't want to spend money getting a new or aftermarket cat, try
disconnecting the exhaust system past the converter and drill out the
ceramic filaments with an extra long drill bit. You need someone in
the car with the engine running and periodically rev the engine to
blow all the particles out. Reconnect the exhaust system back
together with the shell of the cat in place and get your emmission
tested. I did this with my VW and it passed emmissions for the last 5
years (all emmision categories tested were well below the allowable).
The exhaust noise was slightly louder but I noticed an increase in
power due less restrictive exhaust path.
I later found out that many cars will pass emmissions without
catalytic converters, but the EPA requires all cars to have the cat
installed in cars anyway.