i got a 1992 cummins the truck cranks perfect then about 30sec later it starts white smoking and bucking real bad and knocking. but it only after the white smoking.
i got injecters checked there good. any other things that could be wrong
i need help bad

 

sounds like maybe your injection pump is worn, tell us more about the truck. like how many miles, any performance upgrade... etc etc

 

Could be the timing, try giving it a little bump.

 

could be the turbo

 

could be as simple as water in the fuel too

 

White smoke is usually anti-freeze from what I can understand. Head gasket or cracked head.

 

 

mine did that last summer it would start and run then about 30 or 40 sec later start white smoken and boggin down just like you said so i dropped the tank putt new fuel in after i cleaned the tank out i putt a new lift pump in and it still did it turns out mine was the injector pump i mean these trucks we drive are gettin purty old mines 20 now and ima register her as a clasic just because i can butt stuff like this goes out after a while nothing lasts forever if ya know what i mean butt it could be something just like water in the fuel good luck man

 

head gasket have fun

 

White smoke means vapor, which means you're either over fueling, (ever see a pulling tractor at idle? All that white smoke is unburnt fuel. ) or your engine is trying to burn some other liquid. Fire it up, and go to the exhaust pipe and snort a line or two. What do you smell? If the scent is strong diesel, you're not combusting it all for whatever reason. If it smells sweet it's antifreeze. If there's no smell, drop your fuel filter, (which you should do anyway, just because) and drain it into a glass or other see through vessel so you can see what was in there. If there's water, it'll seperate with the diesel. Good luck!