my truck idles at 850rpm...seems fast but I am not sure where it should be set or how to adjust it. My dads 12v seems to idle much slower, but I have not had chance to ask him where it is set.

 

I believe that the idle speed is controlled by the ECM as part of the emission's package. My 98.5 has idled at 850 rpm since it was new. 100,000 miles later it still does. If it fluctuates I'd I'd be taking a hard look at the lift pump or fuel filter. The 12V units could be adjusted but not ours.

 

ah...my pops actually said he thought they always souinded like they idled a little higher. No fluctuation, so I assume its all normal. Like I said it just sounded fast in comparison to his. Thanks

 

your idle can only be adjusted by changing the parameter in the ECM , the lowest you will be able to go is 700 rpm, Dodge or Cummins can do it for you.

 

ohh, I want 700RPM too.

I did not know this.

Cool info. I'll try this in a week and let yall know.

Merrick

 

I put a Genysis scanner on my 2000, it idled at 800 +- 2 rpm. The computer does a very good job of controlling this. I watched it for a long time. Maybe your Dad's has slipped some. As was said above the 12V are adjustable.

 

I am betting MC is hoping for a slower spoolup from 700 rpm to allow for greater sooting of ricers & the like at lights

 

.....I don't know what the Cummins boys have, but I'm quite certain that us Dodge boys can't change the idle on a 24v. I'll hook into mine and see what I can find, but I haven't fallen across any menu in the DRB for idle adjustment.

 

can you adjust it with the Genysis?

 

I didn't see any way to adjust it. But I could look at all the readouts from all of the sensors.

 

My idle can fluctuate with battery usage because my batteries are dying and it effects the Lift pump... 2 new Optima Red tops going in soon.

 

I don't know much about 24 valves but a friend who does tells me if you remove the plastic cover over the VP there is a torx head screw that adjusts the idle. I know she turned her idle down here so it must work.

 

no...that does nothing to the idle on a 24v except throw a tps code. i tried that already

 

Why would someone want a 700rpm idle? Just wondering, any effects then while in gear with an auto, and full load: nighttime during rain and a redlight, stereo.....??

 

Same here.

Merrick