Cm2250 derate

[Rawze]

(07-19-2023 )Aleeex Wrote:  I could not get CT set up…

But in insite I did manage to catch it say “air fuel control derate” under acceleration


Inactive code appeared. Turbo inlet air temp sensor

An 'air fuel control derate' is quite normal normal if you try to accelerate hard, until the turbo catches up to the engine. It is called turbo lag and is normal. It should however not be a sustained condition though, and holding the engine back after the thing catches up to itself.

What is the turbo getting to in boost?. What is the turbo RPM's as well as boost levels when it is being held back?. if the turbo is spinning its arsse off and there is low boost then it is a mechanical issue making lower then normal boost. Blocked exhaust, blocked intake, CAC boot loosing air, CAC leaking too much, or the turbo itself could have damaged turbine blades.. or in some cases.. could be the turbo was built wrong like this guy suffered thru:
ref: http://rawze.com/forums/showthread.php?t...8#pid76838

BTW: You did not mention what the make/model truck this is. Some trucks need different turbo settings to make them have proper boost.