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I copied this from another thread... Matt from Spartan Deisel posted. Different engine but simular symptom:
Raw, completely unburned diesel smoke is white. Period. This isn't an opinion, it is just fact. The color becomes darker with more complete combustion (until it starts to become opaque/clear).
Here is a quote straight from Ford concerning this precise issue-
Some vehicles equipped with a 6.0L diesel engine may experience white smoke, lack of power, exhaust odor, surges, running rough, or no start when cold. These conditions are caused by the injector spool valve sticking internally during cold engine operation (engine oil temperature (EOT) less than 70 °F ( 21 °C)) . The concern is typically evident following a cold start after an overnight soak at ambient temperatures below 70 °F (21 °C). and may last 3-5 minutes or longer as the vehicle warms up. The concern completely disappears after driving and the EOT is greater than 150 °F (66 °C). This concern typically occurs on vehicles with greater than 15,000 miles (24,140 Km/h).
I've also included in PDF file format a complete copy of the Ford TSB concerning this issue. If you won't take our word for it, surely you will take Ford's.
When the spool gets "sticky", it slows down. This causes huge reductions in injection timing (to the point where fuel is still firing during the exhaust stroke) and a good portion of the fuel never even sees compression or combustion; it simply leaves out into the exhaust during the exhaust stroke. This causes low power, missing, and white smoke. The knocking comes from residual fuel that gets left in the cylinder and prematurely burns on the next compression cycle.
The truck in question does not have any signs or symptoms of cooling system problems- the white smoke coming out the exhaust is not from water/coolant but from raw fuel. The newest flash from Ford should help, if not solve the issue. If it doesn't, the injectors will need to be removed and either replaced or remanufactured to solve the stiction issue.
2008 F450 Kings Ranch - Black/Gold Dually-Fully Loaded, Spartan Phalanx Tuner-Fully Loaded, DPF Delete, AFE Stage II PG-7, 160 Gallons of Fuel, Big Woody!