[oldtimer179]

I have a problem with my 03, 6.0, 5 speed auto, F350, crewcab, longbed, it loses power when the outside temperature gets above 90+ degrees. Taking off from a stop it starts away just fine but when it should start accelerating it just barely creeps along accelerating very slowly. Instead of the torque pulling the truck up to speed the motor revs up over 3500+ rpms before it shifts and it still accelerates very slowly. When it gets up around 60mph it seems to get back to normal and accelerate normally from then on. When the temp drops back down below 90+ degrees everything returns to normal, it doesn't matter if the air conditioning is on or off, it still doesn't want to accelerate. Everything else works fine and it starts and runs perfect until the temp rises above 90+ again. Any ideas, I'm thinking possibly the ICP but I don't know if that covers acceleration factors. /ubbthreads/images/graemlins/shrug.gif Thanks

 

[GregH]

I've had a few of the early build turbos start to hang up when the outside temperature is fairly high. Seems odd, since the temperature at the vanes and unison ring shouldn't be affected very much by ambient temps.

The ones I've seen had underboost codes and no turbo windup. They responded well to cleaning.

 

[dekean867]

Mine had an under boost code. Dealer pulled the turbo and replaced it because of rust. Under warranty . /ubbthreads/images/graemlins/cool.gif

 

[KroolDeath]

See this thread here of my experience:

http://forums.thedieselstop.com/ubbthrea...e=1#Post3383803

Your situation sounds like early symptoms I was experiencing which has degraded immensely at this point (because I don't move forward at ALL). You'll notice in one of my posts that it seemed to have this problem in hot weather only.

But its still at the dealer so I can't offer any advice except to say they cleaned the turbocharger and replaced the VGT Solenoid. I think they are seeing underboost codes as well but it isn't the turbo I believe that is a symptom but not the root cause as I don't think its getting fuel.

 

[bluemike]

I have been having this same problem with my 2005 and now have it narrowed down to either direct drive selenoid or clutch pack. I had the ICP replaced did not change anything. I will be dropping pan and taking a look to see what i can see. /ubbthreads/images/graemlins/biggrin.gif I will let you know what i find /ubbthreads/images/graemlins/grin.gif