High rpms during extended idling.

Are you sure its not trying to do a regen for the DPF? What engine do you have?

 

Its probably trying to do a regen. If you are continually interrupting the regen you are going to give yourself major headaches in the future.

1000 RPM isn't anything to be concerned about if the ECM is commanding it for a legitimate reason like a regen or to keep engine temperatures up in a specific range. I mean it probably spins over at 1,400 or more driving down the road with no problems.

 

I keep up my Cat engine rpms until my oil pressure is at 60. Cat recommends it.

 

No diesel should be extended idle under 1000 rpm.

 

If the truck is increasing idle on its own I would leave it alone.

In older diesels it was necessary to increase idle to more efficiently burn the fuel and avoid "slobbering" and cylinder wash-down. That is not as much of an issue with newer engines, but extended low-speed idling should be avoided.

In addition to @Diesel Dave's advice, I would do as Cummins recommends:

• When idling is necessary to maintain cab/bunk compartment temperatures, select the lowest idle speed possible to maintain cab heat.
• Select the lowest idle speed possible to maintain engine temperature of 140* F in winter operation.

 

A D13 in a kw T680?