Needs a tune up you are burning too rich, too much gas in the carburetor.
Blowing black smoke is indicative of an oil leak in the engine.
remove spark plug from engine leave the wire connected and try to start it id the spark plug sparks your good
There is no such engine as a Cummins 2500 Diesel.
The timing of the engine is off or the spark plug wires have been hooked up incorrectly.
Did you screw up the cam timing while replacing the water pump? Did you try manipulating th throttle control (gas pedal) when trying initial engine start after major repair? Did you forget do plug something important back in?
You probably have a little oil seeping into the combustion chamber while the engine is off. Once you start the engine, this oil is burned and causes the smoke you see.
White smoke at start up is due to moisture in the exhaust or on a diesel it can be normal due to the engine being cold.White smoke at start up is due to moisture in the exhaust or on a diesel it can be normal due to the engine being cold.
there may be leakage in your coolant water cap at the time of starting vibration causes water to escape from it entering in to the engine causes white smoke
valve seals. Can be replaced with engine in truck & heads do not have to be removed.
WHITE SMOKE is engine coolant / antifreeze burning. That is due to a head gasket leaking on the 5.7L 350 engine.
Usually that's oil left in the combustion chamber. That is, if it's happening only when you start the engine
pressure test the coolant system you will find a blown intake or head gasket
Cold start
Blowen motor
If you do this incorrectly you will have engine damage when you attempt to start the engine. Take it to a professional and have it done right.
condensation
White smoke is unburned fuel, usually caused by low combustion temps in the engine. It should clear up after the engine warms up. If it takes a long time or the smoke persists when the engine is warm, it could be retarded injection. If you have a cold start lever pull it to the first notch and see if the smoke disappears. If not it could be an injector problem, or an injection problem (injection pump TDI... etc)