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CampingN_C_'s avatar
CampingN_C_
Explorer
Feb 15, 2016

Cummins auto high idle question

On cold mornings the truck will go into a high idle after approx. two mins of starting. It does it automatically when it's cold, I'm not setting the cruise.
Question is, a couple of times here lately it will immediately go into a high idle right at startup.
Assuming the two minute delay is normal? (Read that somewhere)
Assuming the rev up right after start up isn't?
All I'm doing in the mornings is walking out and starting it.
Anyone else's doing this?

22 Replies

  • If your truck has a block heater (110 chord hanging out ) use it, plug it in during cold weather.
  • Intake temperature is used to determine high idle. Really cold initial starts will force it to high idle immediately. If left idling they will ramp back up. Even my '05 does this. Cold starts and it may go directly to 1k rpm, and it was so cold last year that after I got done running down the interstate (with car hauler trailer), I couldn't even get my side gate open before the truck ramped up even while the coolant temp was still above 180.

    Your truck is fine.