on my 03 cummings, it will run great when it is cold but as it warms up or after so long running it just runs like crap. it will not get much over 2300 rpms. changed the fuel filter but no luck. i havent took it in yet to dealer looking to see if i can find the problem. is there some sensor that it might be. it acts like the turbo dont come in. is there a sensor there or what might it be?

 

get the system scanned (autozone for free) and get the codes----guessing usually leads to a lot of money spent without fixing the problem. Bring the codes back here and then someone can help.

 

Thanks. i will do that.

 

I am having the same issues with my 2003, it runs great when cold but after it warms up it runs like crap. I noticed when it is cold my boost will go to 32 psi but once it warms up it runs like crap and it will only reach 25psi of boost. Let me know if you have found the problem. Thanks

 

Forgot to mention, There are no codes when I scan the PCM. Thanks