[Cummins_freak777]

Ok so i was driving back home tonight and noticed that my truck had itself idled up to 1000rpm even though the truck was at op temp. It was 39 degrees out so a little chilly but nothing too serious. I recently installed an edge drag comp and the truck would run the same idle speed with the chip on and off. Bumping the throttle also did nothing to brig it down either. I had a smarty on the truck before this and last winter it would high idle but it would idle faster and i could just bump the throttle to make it go down. Im kinda confused any of yall got suggestions?

 

[Off-road]

is it still doing it? potentially you might need an apps reset?

 

[Cummins_freak777]

if i shut the truck off and restart it the idle returns to normal

 

[Off-road]

does it do it again after restart?

if so try the apps reset.

 

[Cummins_freak777]

like i said the idle returns to normal if i shut the truck off and then restart it. My dad is a diesel mechanic by trade and we recently found some codes in the truck. So after looking around with the scan tool (he has a really high quality one) we went ahead and cleared all codes in the truck and i havent seen anyting in it since. I was just wondering if anyone on here had a similar problem?

 

[Mopar1973Man]

if i shut the truck off and restart it the idle returns to normal

Oh... I hate to say it but that is slightly leaning towards a ECM issue? (Maybe) So do you have any error codes? Could you get a hold of a live data tool and verify the TPS signal and its working properly? You didn't adjust the APPS voltage did you?

 

[Cummins_freak777]

Im not aware of the apps voltage being adjusted. Ill talk to my dad tomorrow and see if we can check it out more. Ive also been having a random abs light come on for just a few seconds and then go off. It seems to flash off when i hit the pedal. Not sure if that will help any but i just figured id give as much info as possible

 

[Cummins_freak777]

the code i was getting the other day was pertaining to the map sensor but since clearing it i havent had an issue with it

 

[Mopar1973Man]

The fact you shut down the truck (reseting the ECM) and starting (rebooting the ECM) and getting a different idle worries me.

 

[Cummins_freak777]

yeah its really odd to me as well... and i cant get the idle to go back to normal by bumping the throttle which is even stranger. Ive had one other time in a parking lot recently where i thought i might have heard it up a little higher but it wasnt as high as this time

 

[Cummins_freak777]

I just did the key trick to see if the truck had any stored codes in it with no luck... My dad was with me when we first heard the truck idled up higher and at first we thought maybe the throttle linkage was sticking or something but after shutting the truck off and then starting it again with a normal idle i would say we can rule that scenario out.

 

[Mopar1973Man]

Once again we are going to have to do some testing. To rule out the APPS sensor I need to know if you have OE APPS or a Timbo's APPS? If its a Timbo's you need to adjust according to Tmbo's installation. If its a OE APPS check the voltage and make sure its UNDER the tag voltage. If so leave alone.

Again double check error codes. See if any APPS codes are present.

After thinking about it a bit it was really common for people to adjust their APPS voltage trying to hit th tag voltage and presto have a slightly high idle because the IVS (Idle Validation switch) was toggled for throttling and it followed APPS voltage. But if the IVS was ground for idle then it would be following ECM idle software and ignoring APPS voltage. So that being said and if you have OE APPS this is all possible...

 

[drewskie211]

My truck did this pulling a big enclosed trailer to Houston probably about 5-6 years back. Only did it that one trip though. After that never has it happened again.

 

[Cummins_freak777]

I had to drive the truck to school today with no problems. Ill try to get in there to check it out this afternoon to give yall some more info

 

[Cummins_freak777]

Alright so i did an APPS reset on my truck last night. I drove the truck to and back from school today with no problems so i think i might have solved the problem. I guess only time will tell though

 

[Cummins_freak777]

Alright so i figured out that my throttle position sensor was going bad over the weekend. The truck gave me a dead pedal and several codes. So after hooking up the scan tool we figured out the reason the truck was idling up was because the TPS was not reading the same as the map sensor so hence the uncontrollable idle up.