6.0 rough idle on cold start
 

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 shit 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?