CM2350 Turbo Spooling at Idle

[Rawze]

(08-12-2022 )rgunn111 Wrote:  

(08-12-2022 )RollinCoal Wrote:  Demandated ?
If so pull a copy and mail it to Rawze

Negative. Just had the DOC and DPF cleaned at my local Peterbilt dealership. It was doing the same thing, before and after.

(08-12-2022 )RollinCoal Wrote:  If not you will need insite and watch your exhuast temps to make sure there getting where they should be

I have insite. Temps look good I think. I have the regen history on my truck PC. I'll see if I can post a screen shot.

If you look at facefook and other places, I am sure you will get a lot of garbage answers for a question like that. This is because ppl do not know know how the engine or its ecm actually works.

What the engine is doing is regulating the exhaust can temperatures. If that DPF, DOC, SCR cans are not at operating temperature, close to 500-Deg F, then the engine will not pass emissions. It is required that the engine maintain those operating temperatures on the exhaust components. The exhaust cans cannot function properly if they are too cold or too hot by any large degree.

The engine makes extra heat for them by changing operating modes, choking the exhaust manifold with the turbo + creating excess friction in the cylinders of the engine to generate heat to warm up- the cans. Once they are at temperature, the turbo relaxes, engine mode changes to some other mode depending on the situation, etc. until it needs it again.

There are more than 14+ engine operating modes in the CM2250, and more than 15+ operating modes in the newer engines. Operating modes with labels such as Alpha0, Alpha1, Chi2, Chi3, Chi4, Chi5, Chi6, Chi7, Chi8, Chi9, Chi10, Chi11, Chi12, (and on the newer engines, Chi13).
referenced in this document in detail: http://rawze.com/forums/showthread.php?t...5#pid67395