Common causes of bad smoking?

[pug306driver]

I'm still a tyro with these cars but learning every day on here.........so do as the guru's say...they are guru's for a reason dude........

oil staining on turbo inlet hose area ( the middle "tube" ) ......ours chuffs out some fumes from the valve cover breather ( which feeds into the air hose from the air filter after the air flow sensor to the turbo ) but doesn't seem to use any oil...........but the turbo rides on a bush which is pressure fed with oil ( al least they where back in the 70's trucks ) .....what colour is the smoke coming from the exhaust...remember that oil will kill the cat........

egr blanking.....yes I understand that not "muck" will be recirculated if this devise is blanked off.....and the vacuum actuator disconnected...but is there feed back to the ecu that the ecu will compensate for the lack of egr.......and use more fuel??

also will low eng temp cause the ecu to fuel enrich??