2002 F-350 7.3L #4 and #6 High to Low Side Open
 

Alright, so here's what I've got:

2002 Ford F-350 7.3L - Unmodified, Stock, no chip, no tuner, 130K miles, been run with off-road diesel most of its life as a farm truck.

Here's what it's doing:
Serious misfire in cylinders 4 and 6. At idle, mild miss. Throttle from 0 to 50 percent, runs well. Throttle from 50 percent to 100 percent, heavy miss, chugging, white smoke out the exhaust.

Here's what we've done so far:
New UVC Harnesses with updated pigtails.
Cleaned Fuel Filter Mixing screens.
Cleaned out fuel tank.
Cleaned bowl.
Changed Fuel Filter.
Changed IDMs
Changed Crank Sensor.
Inspected injectors while running to see if oil is pumping (it is).
Oh, and good compression.


No improvement. Need idea of where to go from here. Pulled codes, and it says Cylinder #4 and #6 High to Low Side open. We don't know what to do at this point.