Lots of trucks will do this on cold days, usually it is unburnt fuel because if incomplete combustion.
We have the duramax and a VW-TDI Diesel.
The TDI smokes a ton more that the duramax does and idles rough as it has no block heater.
Try plugging the dmax in and I bet the problem dissapears.
T
NY
We have the duramax and a VW-TDI Diesel.
The TDI smokes a ton more that the duramax does and idles rough as it has no block heater.
Try plugging the dmax in and I bet the problem dissapears.
T