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It is completely normal for a diesel to smoke black. But, if it just now started to smoke black and everything on the truck is stock, go get it checked out by a mechanic. You could have bad fuel injectors or a dirty air filter. Start with the simple stuff first. And, I'd say from it being a 2004 Powerstroke 6.0L, that your injectors are probably bad.

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Q: Why is there black smoke shooting out of the exhaust pipe in a 2004 F-250 Powerstroke Diesel?
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