Bad cat/bad smell

[John Larson <jdlarson@ix.netcom.com>]

A melted and crumbling cat is most often by a fat mixture, possibly due
to a bad O2 sensor, incorrectly adjusted base mixture setting, incorrect
fuel pressure, or a number of other factors. A leaking fuel pressure
regulator (broken  diaphragm), wasted plugs, a bad plug wire, cap, or
rotor causing a misfire can also cause unburned fuel to pass through the
engine. Last and probably least, is the plugged or clogged injector the
gasoline marketers are so fond of describing. The smell is most likely
due to a fat mixture, not sulfur laden fuel. 2 cars running the same
fuel, side by side, one fat and one not, you'll smell the difference.
Crank up the fuel pressure or mixture in a car not making the odor,
you'll smell it.
Bye for now, John