My 2004.5 Cummins idles @ 750 RPM. If it is parked it will alternate between 750 and 1000 RPM is this normal?

 

I have an 03 which does that when i first start it up, seems to corrispond to when the heater comes on and off for the air and probably fuel, and recharge the batteries after starting, once its on after a few minutes it evens out and stays pretty consistant

 

how cold is it where you are at these trucks have a automatic high idle in cold weather and will idle them selfs up when its cold i live in fairbanks alaska and during the winter my idle is never below 1000 rpm

 

It is mabe 20 to 30 degrees, our winter is just starting, that maybe what it is.

 

Completely normal. It goes off the intake temp I beleive. They kick the idle up to 1000 so they warm up quicker and it's easier on everything to idle that little bit higher.

 

Its your heater grid cylcing. This completely normal for cold weather. No worries.

 

the heater grid wont make the idle jump that much, maybe 20-30rpm

Waldo, take your rig to your local dodge dealer and ask them if they can enable the elevated idle in your truck
If you press the cruse on button the idle will kick up to 1000rpm, and if you press the acel button it will idle up to about 1400rpm to warm up even quicker

 

Yep, if the intake temp drops it will idle up to keep the cylinders warm and stop wet stacking. Built into the ECU.

 

If you press the cruse on button the idle will kick up to 1000rpm, and if you press the acel button it will idle up to about 1400rpm to warm up even quicker[/QUOTE]

Does this work on an 07? I tried this a couple of days ago and could not get to function.

 

Mine does it too.