| Canadian Bum has a good explanation.
In addition, there is a term called "loading up". Older diesels where the fuel delivery is not computer controlled are more prone to loading up at idle, but they can all do it. The 1st good throttle application will give that puff of white/blue and clean it out.
Don't excessive idle the engine. Look up the term "diesel glazing cylinder walls" in Google.
Elevation will make this more noticeable too. |