indeed , when i first drove a 3rd gen i was like WTF ?

 

Really? Mine's never done it before. At least not like it has been the last few days. Heck, today I drug the 5th wheel camper home from where I had some work done to it. About 15 miles or so. I pulled into my driveway, threw the trans into granny gear (bit of a tight, rough corner off the road) and the truck "idled" at 1100 rpm's almost the entire 100 yard length of my driveway before finally dropping to it's normal 750 rpm idle. About 10-12 seconds worth. Ain't never donr THAT before!

I have noticed that when thew truck/engine is cool, this "hang time" is pretty much non-existent. Just when everything is up to operating temp.

 

Ok yea, that's not normal... When mines in high idle it won't idle down sometimes but that's only happened in winter obviously...

 

Just to be clear when you floor it and let off it stays at 1100 rpm for a long time?! Or when you give it a little pedal it hangs at 1100 rpm? The Idle is controlled by the ECM Only the residual pressure in the fuel rail after a full pedal apply will hang the rpm's for a few seconds "When your sitting there it seems alot longer" A pressure box will exaggerate this a bit more. If your going 10+ seconds after releasing the pedal there is something wrong! 10 seconds is a long time!! So you need to check the things that the ECM is reading to determine Idle. Start with your pedal is it hanging up? Is the sensor sending the wrong info? This may be a bit more than your average guy can handle so a trip to the dealer would be a good choice even for me! Their scan tools are awesome!!

 

Nope. Not flooring it. Normal driving... especially when warm. Shifting gears. Coasting to a stop. That kinda thing. The occurence with the RV yesterday was, by far, the longest it has hung at 1100 before dropping down to the normal 750. Wondering if the heavier load the engine is seeing before being asked to return to idle, the longer it will "hang"?

 

Have you tryed removing the edge and seeing what that does? Any fuel rail mods? Does this make it hard to shift?

 

Yeah. the Edge has been removed ever since this all started. Fuel rail is stock. It doesn't make it hard to shift... just hard to shift smmmmmoooooooth.

 

 

OK take it out back and put her down!This has got me stumped right now!
Maybe a cummins guru will stumble upon this till then sorry I'm stumped!

 

i would go and have your injectors tested to see if they are leaking by. mine did the same and i ended up having two bad ones. be ready to spend some bucks if you do have a bad one