i wrote a fuel filter change that i did on this 04 6.0 diesel f550 for my friend. so changed both fuel filter and put two new batteries in. it fires up but for about 5-10 seconds it stumbles like its clearing its throat. not a stumble like its going to die but alittle rough idle and then idles out fine. then runs fine after that. before i did the fuel filter change i dont recall that ever happening. any ideas?

 

Did you cycle the key 5-6 times before cranking it?

 

no i did this about 2 weeks ago. its been ran and used. shouldnt have to cycle it several times every time i use

 

Did you use OEM filters? Did you put the new o-rings on and oil them before you put the cap back on?

 

yup ford filters. new orings and i put alittle red grease light thin coating according to powerstrokehelp.com

 

I think I'd pull the upper filter and make sure it's not draining back down. I don't know why that'd cause stumbling at startup, though. You may have nicked the o-ring on the lower filter, which can cause air to be pulled into the system. But again, that should cause problems all the time, not just at start.

I think I'd start checking the FICM voltage, operation of the EGR valve and check for codes. It could be just a coincidence that the problem started now.

 

yeah dude doesnt take care of it . 23 or 24k miles on it too lol

 

Moved to the 6.0L Powerstroke Diesel forum.