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How is your air filter? Have you cleaned it or replaced it lately. Have you ever removed the snorkel from the fender? My truck use to roll out the black smoke pulling up hill. I removed the snorkel in the fender and de-webbed the upper plenum, (S engine) and my smoke was diminished quite a bit. I still think that it may have been do to all the soot build up but don’t know. Yours shouldn’t have any soot being an F engine though. I have recently replaced the injectors and glow plug and I have a hard time producing any smoke at all. Now I get a little smoke pulling up hill and at WOT only. Check for air restrictions.
 
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