GM bully said,
<a bum o2  sensor can cause
a VERY rich mixture, ruining the catalytic converter, and possibly burning
valves, or causing other BIG problems.>

Hi,
 the maintenance thread just gave me the last piece to my engine problem
puzzel.  I bought the van with 96 K and the oxs light on (never replaced
it).
never had trouble until I clogged up the cat  at 136 K, thus ruining it.
another month or so later I noticed power loss .  the power loss is hardly
noticable, but I can notice.  Now I burn a little oil no smoke or anything.
the compresion  is 137.5, 120, 185, 162.

with oil, the left readings are 162.5, 144.

I guess my question to you is what are those other really bad things that
happen with out the sensor, that you did not mention.

and

if you or anyone else could tell me the best approach to fixing my engine.
and how long will it still run relativly well as is (now have o2 sensor).
I am going to drive from coast to coast in a matter of months.

thanks alot
seth gordon
84 WLE