white smoke on gear change

[reddruss]

i have a 2000 f-450 7.3 psd, atm, 4x4 with 168000 miles. when truck is nice and warm, it will start to blow white smoke and will loose power when changing from 2nd to 3rd gears, and will have a severe loss of power untill i shut it down and let cool down. i have changed the fuel filter, fuel regulator and back pressure sensor. oil was low when this starting happening. have a buddy with a scanner that showed what was thought to be wrong, changed above parts and still has problem. scanner now shows no trouble codes. at this point any help is greatly appreciated. truck does run and shift great until this happens. thanks

 

[Hoss 350]

i have a 2000 f-450 7.3 psd, atm, 4x4 with 168000 miles. when truck is nice and warm, it will start to blow white smoke and will loose power when changing from 2nd to 3rd gears, and will have a severe loss of power untill i shut it down and let cool down. i have changed the fuel filter, fuel regulator and back pressure sensor. oil was low when this starting happening. have a buddy with a scanner that showed what was thought to be wrong, changed above parts and still has problem. scanner now shows no trouble codes. at this point any help is greatly appreciated. truck does run and shift great until this happens. thanks

My next guess would be under-valve cover wire harnesses. Try that one, get the new clips from Ford and see if it helps...