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Black smoke is a sign of an overly rich fuel/air mixture. White smoke is a sign of coolant entering the combustion chamber. Most likely you have a blown head gasket. Other symptoms are loss of coolant with no apparent leak, loss of power, miss, oil level overfull, a white foamy substance on the underside of the oil fill cap. Stop driving this truck until you find the problem. Driving it with a blown head gasket will destroy the engine. A compression test will verify this.
Check the air filter and check the fuel filter. Most diesels lose power from a dirty air filter and moisture or dirt in the fuel filter. When you remove the fuel filter pour the fuel in a glass jar and let it sit awhile if you see two different fluids in the jar you have water at the bottom and fuel on top and need to replace the fuel filter. I think the EGR valve may have been a coincidence. let me know .
i had this problem and thought the fuel filter oil filter needed replacing so i have just had a service done but problem is still there but not as bad. been told it could be the AGR valve or a split pipe going to it which recuirculates unused fuel back to burn again. therefore unspent fuel is coming out of the exhaust causing the black smoke. i am still looking for the answer aswell, hope this helps.
The 6.9L and 7.3L diesel engines use a one-piece spin-on fuel filter. Do not add fuel to the new fuel filter. Allow the engine to draw fuel through the filter.
Remove the spin-on filter by unscrewing it counterclockwise with your hands or a strap wrench.
Clean the filter mounting surface.
Coat the gasket or the replacement filter with clean diesel fuel. This helps ensure a good seal.
Tighten the filter by hand until the gasket touches the filter mounting surface.
Tighten the filter an additional 1⁄2 turn.
NOTE: After changing the fuel filter, the engine will purge the trapped air as it runs. The engine may run roughly and smoke excessively until the air is cleared from the system.
hi have you checked the air filter is it dirty , drain the fuel filter , sounds like the timing is out , the fuel pump timing could be one tooth out , all above is a cheap check before starting any where else .
Is the check engine light on? Any more specific info like year, make, model, what color the smoke is, how many miles, etc........ This could help to narrow down the problem other than the smoke which all diesels do with quick acceleration. You might get a quicker answer if you are more detailed!