Cold Start

[RamThatStroker]

Started parents truck three times in the row the last three days without plugging it in and with temperatures below 20 every night and truck did gradual ramp up from normal idle to 1000rpm. From reading the rest of the posts the operation of this system seems a little erratic and hopefully not a problem.



Joe

 

[Casey Balvert]

Mine went directly to high idle immediately on startup for the first time this weekend. It was 10 degrees and the truck had been sitting for 24 hours. Yesterday, after driving 20 miles to work, I stopped to drop off my new fiver tailgate for painting and left it idling for maybe ten minutes. When I got back to the truck it had kicked back to high idle. It was twelve degrees. I was using a winter front. I think all this is normal. We are just not aware of how all the parameters come together to cause this. My ten Canadian cents, 2 cents US



Casey

 

[David Muench]

If you touch the brake the high idle cancels, so I am careful not to touch any pedals (I think touching the gas does it too). This morning it was 23F, truck had sat all night, and that means it was 25 degrees warmer than yesterday AM. . And it went to 1000 rpm right on start.



Crazy thing. It does seem to warm up and smooth out nicely though.

 

[Dean Upson]

I could be wrong but, haven't some of the "big diesels" been doing this "high idle" thing for years?



Dean

 

[bzingre]

Big Trucks

Dean,



Not instantly, and the big trucks have the parameter that allows the operator to manually step up the idle with the cruise switch. This is true to both Cummins and Cat, not sure about Detroit, Mack, or Volvo. The CTD in the Ram is automatic. I am just interested to see how the ECM reads these parameters in order to determine normal start or "rocket mode. " :{