4000 exhaust problems... Help

[Elmbark@aol.com]

Hello All, 
My 4000kcs has small amounts of water(I believe) coming out of the exhaust
when I drive it-how often I don't know.  In addition to this, there is always
large amounts of "smoke" coming out of the exhaust.  Also, I don't have an
oxygen sensor it has been removed, along with the Cap for the CO tap tube,
and an end cap has been put on the exhaust(in the spot where the missing
parts should be).  I would like to know how does not having an Ox sensor, and
tap tube affect the running of my car and/or how might it in the future.  How
hard is it to install a new tap tube...My inexperienced eyes missed this when
I purchased the car.  Any answers and suggestions about how I can go about
solving this would of course be most helpful.    
Thanks, Chris