Cm870 low boost high egt

[Wesoja2]

(09-03-2026 )Rawze Wrote:  

(09-03-2026 )Wesoja2 Wrote:  Has this issue ever been solved? I have the same thing going on with mine. Does it with EGR intact or demandated. RR also tuned my truck and we had this same exact issue that still has never went away

What are the EGT's, boost, etc?.

also maybe this post helps...
https://rawze.com/forums/showthread.php?...9#pid85889

EGR is intact and functioning. New turbo (OEM) not aftermarket less then a week ago, new cooler, all new sensors, motor harness and RR flashed factory file in it 2 weeks ago cause I wanted to try diff ECM. Only aftermarket part is a {big-name trash tuning} intake pipe. It will not make more then 32-33psi above 1500 rpm’s and 1000-1100 degrees in a hard pull. If you pull it down around 1400 it’ll go up to 37ish and egts will come back down into 800-900ish. EGR flow derate kicks in above 1500 or so. I’ve confirmed no leaks in system and feed tubes to egr diff pressure are clear and flowing. I do notice a bit of moisture around the diff pressure sensor orings when I’ve pulled in off, almost looks like condensation as it’s not sticky. Mufflers are less then 6 months old and egr valve is exactly 1 year old. It does seem to run “better” the warmer the outside temp is.