[V6-12v] Dead cat?

[Tom Christiansen]

Marc,

I changed the O2 sensors last year some time. I haven't had any
trouble codes thrown.

These might actually be the original cats. I bought the car with 107k
miles on it. Now it's up to 148k...

Tom

On 12/9/06, The CyberPoet <thecyberpoet at cyberpoet.net> wrote:
> Dead catalytic converters are usually caused by bad/defective O2
> sensors which are telling the lambda sensor system to add too much
> fuel, which in turn causes the temp in the cats to rise until the
> substrate melts into slag.
> When they melt, they can block up the passage, causing significant
> back-pressure which can cap the power availability (esp. RPM's)
> coming out of the engine.
>
> Cheers,
> =-= Marc
>
>
> On Dec 10, 2006, at 12:02 AM, Tom Christiansen wrote:
>
> > Folks,
> >
> > Sorry to bring this up for the 246th time, but I search the archives
> > for the symptoms of a dead cat and didn't have much luck...
> >
> > I think one or both of my cats just died. Thankfully, I'm not talking
> > about the fuzzy furball animals... The symptoms are as follows:
> >
> > About a week or so ago, it developed a new sound. Sounded a bit like
> > one of those souped up rice rockets. OK, not that bad but in that
> > direction anyway. It still drove fine and the sound was only present
> > at 2800-3000 RPM so I decided to live with it.
> > The cat's been rattling for years until it was warm. Tonight the
> > rattle was gone. As was quite a bit of engine power. On a slight uphil
> > stretch of the freeway I could barely maintain 65 MPH. This was with
> > the pedal to the metal. Normally, I would have no trouble accelerating
> > up that hill. When I got off the freeway I noticed that it was running
> > a bit hotter than normal. Not much, just a bit. I also noticed that in
> > first gear on a level road, the engine won't go past 5000 RPM or so.
> >
> > This got me thinking dead cat... Does this sound reasonable?
> >
> > If it's the cat, I'll probably just take the car to Midas. Yeah, the
> > sweet audi purr (which I love) may be replaced by something else, but
> > I just bought my first house so I don't really need huge expenses at
> > this point...
> >
> > Is there something about swinging dead cats over your head brings luck
> > or something...? :-)
> >
> > Thanks,
> >
> > Tom
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>