Ford Powerstroke Diesel Forum banner

bad fuel economy

  1. 7.3L Rough Idle/Knock, White Smoke when Cold, Loss of Power

    99-03 7.3 Motor Problems
    Symptoms: -Rough idle/distinct knock that is worse when engine is cold -Lots of white smoke on cold start (unplugged)-Some white smoke when plugged in -Strong smell of diesel at all times -Loss of power -Terrible fuel mileage Timeline: 1) Excursion was filled with gasoline accidentally 2)...
  2. 8-10 mpg in 7.3 powerstroke??? Ideas of possible issues?

    99-03 7.3L General Discussion
    I just bought a 2000 f350 with 275k mi,crew cab sb 4x4. Did a full tune up, changed all the fluids to synthetic, new turbo up pipes, new tranny cooler, complete 4" exhaust, dp 3 stage tuner, stock, tow haul, and economy. Compression tested all injectors and im still getting8-9 mpg. Put 6" lift...
Top