CM2250 no boost in top gears

[hct5]

I have been having issues with our 2012 KW W900. It was demandated a couple of years ago and has been running grear with no issues. we installed a new trubo around 5 months ago and had no issues till about one month ago. the truck will run great for say 8 hours and then in the top gears 12/13 the boost drops to 0. sometimes he can drop a gear and it kicks back in and everything works great. i found the CAC leaking so i replaced that and it still has the same issue. new air filters. no leaks in the charge air system. cleaned the imap sensor. new exhuast pressure sensor and i also cleaned those tubes out. no exhaust blockages. just not sure where to go from here.

[mikkhh]

Pull the programming file from ecm and have it looked at as a first step...

[Rawze]

like others have said...

Copy the program from the ecm and e-mail it to me for a proper review of what someone did in there.

For all anyone knows,.. the issue might be right in your face.. but some idiot might have blocked/hidden the fault(s) from showing up in the dash that would otherwise tell you what is actually wrong.

info on copying the program out: https://rawze.com/forums/showthread.php?...5#pid72945

[hct5]

thanks for the info, im working on finding that software now. the truck just got back and i hooked insite up to see if any codes had come up and it had 64 counts for code 2973 and 4 counts for code 2346. i did both the troubleshooting trees and found nothing wrong.

[hct5]

alright so 1600 rpm it has o boost and the turbo rmp is at 35883. then it will randomly jump up to 68000 and the unit will have 10psi of boost. i have the exhaust and intake off the turbo.

[Rawze]

(06-05-2025 )hct5 Wrote:  alright so 1600 rpm it has o boost and the turbo rmp is at 35883. then it will randomly jump up to 68000 and the unit will have 10psi of boost. i have the exhaust and intake off the turbo.

Maybe do a turbo inspection and re-calibration while your at it?.'
ref: https://rawze.com/forums/showthread.php?...18#pid1618