95 Heavy black exhaust smoking

[curiegas]

I have a lot of black smoke when im driving. I see a huge cloud. It just started a couple of days ago. Here are the codes I got.

KOEO
111
332

KOER
116
332
538
536
521
632

I have no cats. I do have an oil leak from the cam seals. There is black soot on the tailpipes.

Could I have messed up my O2 sensors?

Thanks in advance.
Cecilia

 

[rangerj]

Black or dark gray exaust smoke indicates a very rich running engine. Inoperative O-2 sensors will send the EEC computer into the "limp-in mode" which is rich. You should also consider a plugged air cleaner, fouled spark plugs, poor performing plug wires, and/or anything blocking the flow of air into the throttle body or intake. Check the snorkle tube for any splits or cracks and check for any vacuum leaks.

 

[curiegas]

I'm sorry but what and where is the snorkle tube?