04 F250 6.0L Running Problem

[gunntg]

First thing in the morning, driving about 55-60mph I get a bucking when driving, let my foot off of the gas and it stops bucking. But I plugged the heater portion up and let it sit overnight and it ran fine with no bucking problem. Would that be the FICM or something else? I have seen the previous forums on this problem but I didnt know wether or not it was due to the FICM because of the heater correcting the problem when it is hooked up. Any help would be greatly appreciated.

[gtnit]

You can check the FICM pretty easy just do a search for it. You just remove the little plate on top and check voltage. It sounds to me lilke you may have a stiction problem and that is why it is better with it plugged in. When was the last time it was flashed? a new flash might help if it has an old one in it. Keeping the oil changed like supposed to?

[gunntg]

FICM was flashed about 2 weeks ago. Engine oil has been changed at regular intervals with Rotella 15/40W. When I bought the truck I changed the fuel filter. And what is a stiction problem? thanks for your help.

[Clay Henry]

Originally Posted by gunntg

FICM was flashed about 2 weeks ago. Engine oil has been changed at regular intervals with Rotella 15/40W. When I bought the truck I changed the fuel filter. And what is a stiction problem? thanks for your help.

do a search for that and you will come up with lots of reading.

[gtnit]

like the guy said above do a search and you will get plenty on stiction. The FICM can be checked for voltage output to know if it is good or not. I think there is a write up in the tech files if not than do a search for FICM voltage check and it will walk you through what to do. It definatly sounds like an injector problem though. Check your fuel pressure and make sure that is good as well. YOu can get a fuel line adaptore from ITP diesel and then just pick up a gauge locally that can be used for fuel. I think i spent $40 on the fuel line and about $12 on a gauge and now i always have a reading on my fuel pressure so well worth the $. (fuel pressure and FICM can both take out injectors pretty easily)