Hey everyone I'm new to these posts. I bought a 03 f250 6.0 from a buddy's dad about 2 months ago and it ran awesome until about a week ago.I'd start it up in the morning and go to work and it'd run like **** until it got up to operating temp. It stared getting worse and worse since it began. Now if it sits over night and I go to start it in the morning, it will fire up and kill. So then I turn it over again and it'll stay running but it sounds like its misfiring. Once it sits and idles then it starts to sound better but when I take off it runs rough and loses power for the first 2 or 3 miles then it runs fine. I've been reading around and have seen many different things that it could be. I just tested the FICM today and it came out to have 48V with the key in the on position and it had 45-46V when it was running. Any help would be awesome as far as what you guys think and what I should do

 

any smoke when you start it?

 

I have a 04 and it was doin the same thing. It took me awhile to figure it out but it got alot worse over time and then my hpop took a crap. you also my just need to do your glow plugs and relay. also what was your ficm voltage while you were turning it over.

 

What's your hpop? I was reading 46 volts when it was cranking over

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Yea white smoke for about 20 seconds and then it stopped smoking

 

I have a 04 f450 that did this. Once the injectors were replaced it was good as new.

 

What would you recommend doing? I don't wanna put the money into injectors if its not them forsure

 

I guess the best thing you can do it have a mechanic scan the truck!

Here is a good video about the Hpop and it shows you the scanned data and what to look for, all in all. I would start pursuing the hpob since the revised parts seem to be almost mandatory.



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Anyone else have any idea what to do

 

buy to bottles of rev x oil additive and change your oil once the oil change is done put the 2 bottles into your oil and drive your truck around for 1/2 hr you should notice a huge improvement on your next start up

 

I just did an oil change 200 miles ago. Is it too late to add it or can I just add it now?