03 high idle issue - Competition Diesel.Com

Nowak's Diesel · 05-30-2017, 10:41 AM

03 6 speed manual. Fire it up and it idles normal, touch the pedal barely and it will go into high idle mode. If I hold the brake down it will slowly return to a normal idle. It does this when normal running temperature. When driving and coming to a stop when I push in the clutch it will go into high idle. Leaning towards apps sensor possibly, it will lose the pedal when driving sometimes then come right back up within seconds. Motor is smooth. It has had injectors within 30k miles. My data log shows 0% throttle when it's high idling and the rail pressure is normal. Any help would be greatly appreciated.

Red Sleeper · 05-31-2017, 06:53 AM

Does the truck have a tuner on it? If so, what brand?

Nowak's Diesel · 05-31-2017, 01:45 PM

Completely stock, besides exhaust.

Nowak's Diesel · 06-03-2017, 10:10 AM

No one else ever come across this problem ?

Red Sleeper · 06-03-2017, 10:58 AM

My dad has an early 04 with this same symptom. Doesn't do it all the time, just once in a while. Ambient temperature doesn't effect it, truck runs fine otherwise. It does however have a banks 6 gun tuner. Bone stock otherwise. We have tried completely removing the tuner and it would still do this.
I searched here and on Cummins forum for an answer.

We have just dealt with it honestly.

SixOhh · 06-14-2017, 09:37 AM

Have you tested the APPS?

go to timbo's website and there is a video

motorwood · 10-06-2017, 11:27 PM

Have had same problem for years, was told ecm needs reflashed, haven't done it yet.

05-30-2017, 10:41 AM	#1
Nowak's Diesel Name: Nowak's Diesel Title: Diesel Enthusiast Status: Not Here Join Date: Jan 2012 Location: missouri Member`s Gallery Posts: 210	03 high idle issue 03 6 speed manual. Fire it up and it idles normal, touch the pedal barely and it will go into high idle mode. If I hold the brake down it will slowly return to a normal idle. It does this when normal running temperature. When driving and coming to a stop when I push in the clutch it will go into high idle. Leaning towards apps sensor possibly, it will lose the pedal when driving sometimes then come right back up within seconds. Motor is smooth. It has had injectors within 30k miles. My data log shows 0% throttle when it's high idling and the rail pressure is normal. Any help would be greatly appreciated. __________________ 04.5 ecsb, second gen swap,S369sxe,180hp injectors,head studs,Holley blue, Built auto. Tuned by me with hp tuners🍺🍺🍺

05-31-2017, 06:53 AM	#2
Red Sleeper Name: Red Sleeper Title: Too Much Time Status: Not Here Join Date: Aug 2009 Location: Lone Star State Member`s Gallery Posts: 4,595	Does the truck have a tuner on it? If so, what brand? __________________ Nick J '14 Silverado LTZ 5.3 4wd '05 Cummins QCSB 4wd 48re '91 Cummins w350 5spd

05-31-2017, 01:45 PM	#3
Nowak's Diesel Name: Nowak's Diesel Title: Diesel Enthusiast Status: Not Here Join Date: Jan 2012 Location: missouri Member`s Gallery Posts: 210	Completely stock, besides exhaust. __________________ 04.5 ecsb, second gen swap,S369sxe,180hp injectors,head studs,Holley blue, Built auto. Tuned by me with hp tuners🍺🍺🍺

06-03-2017, 10:10 AM	#4
Nowak's Diesel Name: Nowak's Diesel Title: Diesel Enthusiast Status: Not Here Join Date: Jan 2012 Location: missouri Member`s Gallery Posts: 210	No one else ever come across this problem ? __________________ 04.5 ecsb, second gen swap,S369sxe,180hp injectors,head studs,Holley blue, Built auto. Tuned by me with hp tuners🍺🍺🍺

06-03-2017, 10:58 AM	#5
Red Sleeper Name: Red Sleeper Title: Too Much Time Status: Not Here Join Date: Aug 2009 Location: Lone Star State Member`s Gallery Posts: 4,595	My dad has an early 04 with this same symptom. Doesn't do it all the time, just once in a while. Ambient temperature doesn't effect it, truck runs fine otherwise. It does however have a banks 6 gun tuner. Bone stock otherwise. We have tried completely removing the tuner and it would still do this. I searched here and on Cummins forum for an answer. We have just dealt with it honestly. __________________ Nick J '14 Silverado LTZ 5.3 4wd '05 Cummins QCSB 4wd 48re '91 Cummins w350 5spd

06-14-2017, 09:37 AM	#6
SixOhh Name: SixOhh Title: EPA unfriendly Status: Not Here Join Date: Aug 2008 Location: Magnolia, TX Member`s Gallery Posts: 1,108	Have you tested the APPS? go to timbo's website and there is a video __________________ 07' Silver 2500 5.9 4x4 LWB Goerend 48re-csp5/EFI- T&C Mild Cp3-F1 Apex 7.5 -S369sxe Amsoil Coolant Bypass -Airdog-D&J- Hamilton 188/220 -AFE-ARP Opti-Lube H-Town Off-Road

10-06-2017, 11:27 PM	#7
motorwood Name: motorwood Title: Too Much Time Status: Not Here Join Date: Jun 2010 Member`s Gallery Posts: 318	Have had same problem for years, was told ecm needs reflashed, haven't done it yet.