03 6.0 no power when cold

[lunerman64]

so im at a loss to ideas on what could be wrong with my 03 f350 6.0. it has 240,000 miles on it always well maintained. the truck runs ruff when cold and has no power. but when the truck warms up it runs great. thought it was the ficm but it tests out fine 48v at koeo, 47.6 at starting, and 48v koer. all the injectors test out fine on the standard tests buzz test ect. truck charges at 14.2v. so im lost at what to try next as to find out what my problem might be. any help with this would be great. thanks Garrett

[nylyon]

Over the winter my 03 couldn't get out of its own way in the morning. Same with me, the FICM was good but it ran horrible when cold. I bought 2 bottles of Rev-X and put it in the oil, drove around for 15 minutes then shut it off. The next morning was 40 degrees, the truck fired right up as if I had just shut it off. I ran the Rev-X for about 3,000 miles then changed my oil. I haven't put in any more and my truck is still running great in the morning, of course it isn't very cold in the morning any more.

Rev-X has worked well for many 6.0 owners and it's worth a shot to help you too. If my truck goes back to running poorly in the morning, I will get another 2 bottles.

[XCA2139]

Just had mine in the shop for this 70k on it was the map sensor

[obsidian]

Try some Rotella T5 oil. You are having stiction. Injectors have the cold oil in them and they aren't firing too well.

The Rev-X worked because it thins out the oil a bit and keeps formations from forming. My truck used to do the SAME exact thing as lunarmans but I changed my oil to Rotella T5 10w-30 and it completely solved my problem.

[doubleh1]

same thing as mine brother! 03 6.0 245,000 miles. It runs like crap in the mornings, and it's only 50 degrees! if it's stiction causing this, would replacing injectors work? or is the problem that it's not thin enough, and using rev x should solve the problem? what causes stiction?

[emhowland]

Mine did that and I replace injectors and that did the trick.. And my "Cold" was Phoenix morning cold...

[doubleh1]

yeah, my cold for the past year was san diego haha

[emhowland]

Worked for me I happened across a person that Jacked up his low mile injector plugs during an egr delete and got em for $200.00 then put my plugs on em slapped em in and it purred like a kitten. Whos says there is no use for "trolling"

[obsidian]

An oil change is a HELL of a lot cheaper/easier than changing injectors....

But hey, it's your call.

[emhowland]

I agree I had to change mine anyway.. had a bunch that were excessively leaking oil @ the top by the manifold. The Rotella T has been a hot topic for while too. Worth a shot. I hadn't heard of Rotella T when I had to change mine. Plus the injectors were cheap.