Originally Posted by nhrak275
hi to all new on here, hope you can help me. 04 f350 has two cades p0270, p0279. my big problem is runs fine until 1800rpm starts to miss and smoke whiteish and will not rev over 2500rpm. i added 2gal of coolant in 30 mi, drove another 4 mi still full. open to sugg.
P0270 is #4 injector = second cylinder on driver's side
P0279 is #7 injector = fourth cylinder on passenger's side
The ficm is detecting an open or low injector circuit on both injectors. This could mean the coil on the injector is going bad. Coolant is not the issue with the injector problem. The white smoke and running rough is because the two injectors are not firing properly. You can test each injector circuit for continuity and will tell you if the injectors are toast with a voltmeter. You just have to remove the injector plug at each location on the inboard side of the rocker box.