Ford F350 S&B intake no other mods.
Turbo was farting under acceleration and turbo boost indicator was flopping to zero under load or high speeds so I sent it to the dealer. I just got my truck back from dealer needed ECM updated and now i can not get on the throttle long enough to reach 60 mph with out the limp home mode kicking in. This resets after restarting but what the hell is going on here.

 

bring it straight back to the dealer, seeing how they just re-flashed it, its under their service warranty. sounds like something they messed up.

does the check engine light come on?

 

Not the engine light but the electronic throttle control wrench comes on. I repeated the acceleration and restart three times with the same results

 

sounds like the software in the pcm is messing up. if it was running absolutely fine up to the point where the pcm was updated, i'd say this is the dealers doing.

 

It was not running fine but was better than this. Previously my truck did not seem to have the power it should have and then I was having troubles with the turbo

 

what exactly happened with the turbo and what did they do to fix it? if a problem still exists with the turbo it could be causing this

 

If I was hauling my fifth wheel the turbo would bounce while getting up to speed and "fart" during acceleration. This also happened during hard acceleration up to 70-85 MPH. Take offs were not great, never blew smoke and averaged around 14.6 mpg.

 

ok so what did ford do about it?

 

scanned engine found it was not updated and installed new update along with transmission update

 

ok so they didnt do anything with the turbo? you need to take it back ASAP before they tell you they cant do anything because you waited. whatever they did is most likely causing this, they didnt fix the problem. In all honesty, this sounds like a pcm issue. turning the key off and back on seems to reset it? thats because your pcm needs driving information before it can act and throw codes or lights. it cant know whats wrong until its driven through to a problem. OR the pcm is throwing into limp mode itself because it has the wrong information to compare with what it's actually reading.

does your turbo problem still exist? what else happens before it goes to limp mode?