Question Smoke @ Idle

[the_hammer]

When stopped at a light today I noticed smoke. It looked like normal diesel smoke, just that my truck has never smoked. I had the EGR valve replaced about 5000km ago.

Any thoughts on what is causing it? and can it be fixed relatively cheaply? I would assume that it is from unburnt fuel, and my mileage has gone down.

 

[Kleetus]

might not be closed all the way... black smoke? might have a bad o ring in there, or was sliced on the way back in...