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I would suggest following your manufacturers operating recommendations as they do vary a little.This is straight out of a 2017 QSB6.7 (Cummins) engine owners manual.[ATTACH=full]1016625[/ATTACH]For those wondering what Cummins definition of extended idling is[ATTACH=full]1016617[/ATTACH]Most anything with a high idle feature is simply programming developed in the ecm. It elevates the RPM and if it has a VGT turbo (which most modern emissions equipped engines do, to help meet emissions) the programming also restricts the vanes to help elevate exhaust gas temps. This is beneficial to the engine not just the aftertreatment components as it helps to prevent wet stacking and minimizes EGR usage during cold weather operation.
I would suggest following your manufacturers operating recommendations as they do vary a little.
This is straight out of a 2017 QSB6.7 (Cummins) engine owners manual.
[ATTACH=full]1016625[/ATTACH]
For those wondering what Cummins definition of extended idling is
[ATTACH=full]1016617[/ATTACH]
Most anything with a high idle feature is simply programming developed in the ecm. It elevates the RPM and if it has a VGT turbo (which most modern emissions equipped engines do, to help meet emissions) the programming also restricts the vanes to help elevate exhaust gas temps. This is beneficial to the engine not just the aftertreatment components as it helps to prevent wet stacking and minimizes EGR usage during cold weather operation.
