CM870 High Pyro/Low Boost intermittent under load

[Rawze]

(09-27-2023 )nmazpeterbilt Wrote:  WE have still been fighting with this. There isn't an issue until ambient temperature gets over 90* then the hotter it gets the more we have it. It is a mechanical pyro. There was an issue with the turbo actuator, we had that replaced. Replaced the sensors mentioned here and had EGR checked. Can't figure out why it is doing this. Have had mechanic in the truck with Insite and never can figure out what it is doing that is causing this.

Insite is fairly useless when it comes to silent derates. If ti just keeps eluding everyone, then you might have to use the Calterm software and see what is holding the fueling and/or boost back. The most important settings to watch would be the combustion control path owner, the fueling control state, the aux. emissions control states, etc.

ref: http://rawze.com/forums/showthread.php?t...3#pid58693