OK 1985 nat. aspirated fourtrak diesel that goes like a dream and when running doesn't smoke at all, I know this cos my wife followed in our other fourtrak up hill and down dale, and not a puff. However on start up it's almost embarassing, loads of unburnt diesel smoke but it stops within moments of driving away. The glowplugs are ok and it passed its emission test on the last MOT without a problem so any suggestions. With these still cold evenings in the works car park I'm getting noticed! Must say it is rough on start up but settles quickly but the smoke would indicate that anyway. Any one with any ideas please!!!!