Join Date: Nov 2013
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No power accelerating hard
Thanks to all that regularly contribute. You've built quite an archive.
I replaced glow plugs on my '00 F250, 7.3, 6 speed. Removed intercooler lines, removed valve cover, replaced plugs (all but one tested bad), and reassembled. The next morning (friggin cold) it started great, but ran funny. I drove for 20 minutes with issues when I tried to accelerate hard. It would run fine in all gears until about 1700-2000 rpm. Once I hit the higher rpms, the accelerator would go soft and the rpms would jump to 2200-3000 rpms without any significant power.
When I stopped driving I popped the hood and inspected the fuel lines BC I smelled diesel. The water fuel separator valve was leaking bady. I did a quick fix with an O ring until I could get a replacement. The truck has continued to lose power and jump rpms despite having the fuel issue fixed. I have inspected all of the intercooler joints and they seem to be sealed.
I've driven about 100 miles since the problem started. It doesn't happen in 1-2 gears. If I punch it hard in gears 4-OD it will fail to accelerate at 17-1800 rpms, accelerate only very slowly to the point that passing on two lane would be scary.
Any thoughts appreciated. I have a few ideas, but am hoping to tap into your knowledge before I start replacing sensors or dropping the fuel tank.