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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY. is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
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Old 02-06-2019, 07:18 PM   #1 (permalink)
Block Heater
Join Date: Feb 2019
Location: Frozen Tundra MN 56470
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High Idle Issues

I have a high idle issue, my engine starts to go into high idle then cuts back to normal idle, it keeps doing this over and over. Kind of annoying, if I cant get this fixed I will have to disable the high idle feature.

2006 2500HD LBZ 148k miles, deleted, Edge tuner, 4"

2006 2500HD 6.6 LBZ 148k miles.
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Old 02-07-2019, 08:52 AM   #2 (permalink)
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Michigan Oil Burners Member

There’s only a few scenarios for your symptoms.
The high idle speed will be temporarily interrupted and the engine speed will return to normal if any of the following conditions occur:
. The brake pedal is applied.
. The accelerator pedal is
. The transmission is shifted out
of P (Park) or N (Neutral).
. Vehicle speed is detected. Once these inputs are removed, the engine idle speed will slowly ramp back up to high idle after the normal delay, if the conditions for engine coolant temperature and air intake temperature are still met.

If you can’t get it figured out do this. (High Idle mod)

Last edited by Rvn4me; 02-07-2019 at 09:00 AM.
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