Its too rich.
get the FSM and read how to test parts that control fuel mixture.
mech. injection
or EFI injection
SOURCE: F250 Diesel engine won't start in cold weather
check your glow plug relay! located on the right side head
SOURCE: NO POWER ON COLD START UPS AND BLACK SMOKE COMING
are you letting the igniter heat up before starting it?
SOURCE: 2003 gmc 6.6 turbo diesel sometimes smoke a lot
If the smoke is white smoke and you have it after it has run for a while or when you stop at a stop sign or light it is one of two things or possibly both. I have a 2003 GMC 3500 that had the same proble. It turned out to be a combination of Injector being bad and Glowplugs. Injectors are covered up to 200,000 miles but not the glowplugs. I bought 4 glowplugs of the internet for 10.49 a piece AC Delco New. The dealer replaced all 8 injectors and 8 glowplugs. I paind for 4 GP's and the installation 213.00. Truck has more power and NO white smoke you might need to take it to the dealer. The test for the injectors is about 85.00 but well worth the expense
SOURCE: My old Toyota Hilux 2.2 diesel utility coughs and
use an injector cleaner like stp/wynns in the fuel at double the amount,to clean system,you might be supprised how much difference it will make....
SOURCE: 100 series landy diesel. starts fine cold but not when it is warm
check ignition timing , maybe is advance
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