"freemont" wrote
> After it started to rattle, I had one of the catalytic converters
replaced
> on my '05 Grand Marquis. Since then, I suspect that the engine is
running
> more smoothly, and also seems to have more pep.
>
> Am I imagining this, or can replacing a catcon make a noticable
difference
> in power?
My T-Bird also made a slightly irritating rattling noise. Turns out the
substrate
had come loose in the pre-cat, and the exhaust pulses had bounced it
around
so much that little pieces of it had broken off and made their way to the
main
cat, while the disintegrating pre-cat slowly turned itself sideways inside
the pipe
until it was almost completely blocking the exhaust flow from the left
side of the
engine. Some new cats turned the chuff-chuff-chuff back to a vroooom.
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