Very interested in how this turns out - my 06 6.0 PSD is doing the same rough start thing and the FICM tests great.

It is stock - Just Pulled the EGR valve and cleaned that and added a coolant filter. As soon as I can put the $$ together I want to do an EGR cooler upgrade.

 

Guys, just so you're aware, even a FICM testing at 48V under all conditions can still be bad.

I have two FICM's on my bench right now that test 48V under all three conditions, but cold starting the truck is a PITA. In fact when it dips down in the 20's or lower, I can't start the truck unless it's plugged in. Just something to think about. If you have a buddy with a 6.0 that run's good, maybe try swapping FICM's to see if it changes your starts. FWIW, these two that I have will start the truck and run great when the motor is already warm. When it sits overnight... forget about it.

Powerstroking84, what oil/oil filters did you use? Did you do fuel filters? What brands?

 

I had valvoline Do the oil change... So now that doing the research can I just change the filter? And I got my fuel filters from international. The truck cranks for 2-3 seconds and fires up. Then runs like its got a big cam for a few seconds then I can hear it miss fireing.. And at first there is a cloud of white smoke then it starts to taper off... And the truck runs like crap until up to atlest 170*... If I plug it in it starts a little better but not much and still barely gets out of the way until up to temp... I got a buddy who has a scanner and I'm going to have him do the balance test. Thanks for the help guys. Sorry I wished I had the money to dump into parts but I can't medical problems holding me back...

 

My situation exactly

 

Honestly your symptoms sound EXACTLY like a bad FICM. I believe someone else on here had the same issues, I sent him a FICM on good will to try out... he ended up hooking it up, truck started great for him, so we worked out a deal. Not saying it is... but sure sounds like it.

Just for giggles, how good are your batteries? It may be worth while having them load tested too, they make a world of difference in how these trucks idle.

Read here, I did this for Wohlf16 a while back. He didn't have the exact symptoms, but close... check it out and read here.

https://www.dieselbombers.com/ford-p...m-start-4.html

 

I had the batteries load tested and they turned out good... Not the greatest but they passed... I guess next step is to pull off ficm and try to fix it. I've notice that after it warms up my boost pressure isn't that high( highest I've seen it is 11-12) and I've noticed that the engine has a slight miss every now and then and slow response on take off. So that's why I was thinking injector bc mdub mentioned that earlier. Thanks alot again mdub for all the info and help!!!

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I had the batteries load test and they were good but not the greatest... I guess what's next is to try to fix th ficm... I've noticed that the highest I've seen my turbo boost is like 11-12 psi max... And that the engine has a slight miss after warmed up every once and awhile... That why I thought it might be a bad injector... Thanks alot mdub for all the help and info!!!

 

You have some serious turbo issues if you're only pushing 11-12psi...

Are you getting any smoke coming out when you're at full throttle and you're only getting this amount of boost?

Could be a few things here.

soldering your FICM won't help if you're already reading 48V. I suspect other issues based on the new information of your low boost numbers.

 

Had batteries load tested and had one bad battery - replaced it with a NAPA (this was a few weeks ago) and the truck is still having the above listed problems. As also stated the FICM tested great but I am beginning to think it may be bad because my truck is doing exactly what has been described.

Once it is warm starts great and runs great!

 

No fluid loss no over temps no smoke after warmed up... Nothing at all... I think the turbo needs cleaned bc I don't know how long it sat??? Did I wast $10,000???

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I've never really beat on it yet bc I want to make sure everything is all good... I'll test the wot after work today to see what I get out of my boost ...

 

Well you can't make full boost at 1/2 throttle...

Get it up to temp and ROMP on that thing already! It's either going to go, or not go, and if it doesn't go, make sure you are taking mental notes of what is going on... look for stutters, or smoke of any color, anything...