i thought this would be smooth as glass buttttt i can not get rid of these po171 and po174. i have checked for vac leaks with break cleaner put new intake gaskets new maf new o2s checked the maf wires for breaks and so far none of this has helped. my mods are vinci trucker cam, 799 heads, 4l80e 3200 stall, long tube headers. i have a nelson tune also. did the crank relearn too. the truck drives fine until i get on the gas hard and it boogs and is sluggish to go until i back off the throttle alittle

 

check cam and crank sensors. What do those two codes stand for?

 

Lean bank 1,bank 2. When nelson did the tune did you be sure to tell them this was a 6.0 swap so they could overlay all of the correct 6.0 fuel,spark,and MAF tables over the original tables.

After that next step is to check fuel pressure.

 

i told them it was a 5.3 to 6.0 swap. my fuel pressure is fine. well it is 55psi when im driving. is it hard to get the intake gaskets to seal. im stumped, if i unplug the maf the truck will fly

 

You try cleaning the maf if you have a K&N it could be oiled down. Or possibly they forgot to change the MAF tables. If it's intake gaskets you can leave the motor running and watch the fuel trims on the scanner and see if they go nuts when you hose down the intake with carb cleaner.

 

Call Nelson back and ask them exactly want all they tuned for. The tune a lot of trucks and could have messed up somewhere. Also, did u change injectors? They had to retune for my new ones bc truck was lean or rich cant remember exactly.

 

ok got im getting a retune from nelson, they have my tune setup with 8.1 mar instead of 8.1 truck injectors. hope i get it by Friday

 

I had black bear do my tune for my swap and my 6.0 was cammed and bored and they did amazing work and gave me a sport button for $200 I get 14 city and 21 highway with a excab 4x4