Engine/Transmission (1998.5 - 2002) High idle or 3 cyl idle what every you call it.

[TJSHOTROD]

Can you tell when it is working? I had mine flashed this summer and its been below freezing here and I still have not noticed any change in the idle speed or sound. 1 person told me you would not notice it but I can't imagine that.



T. J.

 

[MCharlebois]

if it gets to the 3 cyl mode ,has to be pretty cold ,you WILL know it... truck should idle up to 1200 rpm then hit the 3 cylinder mode

marcel

 

[johncameron]

Hey Marcel, did you have to completely re-flash your ECM or just turn on the 3-cyl high idle. I'd like to get mine up and running.



JC

 

[MCharlebois]

Hey Marcel, did you have to completely re-flash your ECM or just turn on the 3-cyl high idle. I'd like to get mine up and running.



JC

i believe the dealer just had to enable it,man does it sound like its going to come apart when it hits :--) you can here it from INSIDE

MERRY CHRISTMAS

marcel

 

[johncameron]

My neighbours are gonna love the extra noise :-laf :-laf . My neighbour a cuople houses down has a 2004 HPCR and this morning you could barely hear it. Man they are quiet



Merry christmas to you too!



John

 

[MN Cummins Lvr]

When I had my '99, the high idle did not kick in unless the outside ambient temp was below 28. If I recall correctly, the 3 cyl. feature did not kick in unless outside ambient temp was below 15. Like the others said, you will know when the 3 cylinders shut down. You would swear the engine is going to fly through the hood :-laf



Paul

 

[pcarlson]

The high idle and 3 cylinder temps that Paul posted are about right on. They can very a few degrees depending on how long of a cold soak you give it. If you plug your truck, the high idle and 3 cylinder won't work unless it is sub zero. The 3 cylinder sounds like a jack hammer is running under the hood, but it warms the motor as advertised.

 

[lethal injection]

Anyone know if this would be already turned on from the factory on a 2005?

 

[DRitchie]

high idle is flashed into the comp from factory there is also a manuall high idle feature that the dealer can enable for u

 

[Hohn]

It's crazy when the 3cyl kicks in. Sounds like a P-pump truck with the timing set at about 35°!!

 

[RJPotts]

It is a neat feature. What's really funny is when someone's truck starts to do it and they don't know its supposed to. :-laf

I saw 3 different people at Tellico with 24 valves and their trucks had been sitting for about 3 days without being touched right around 5*F when they started their trucks.

Their faces reminded me of... me when I was younger and would break something, just to get caught as I was trying to hide it.

heheh... that's fun

-R. J.

 

[DRitchie]

high idle is flashed into the comp from factory there is also a manuall high idle feature that the dealer can enable for u

was replying to lethal injections question 05 have igh idle when cold feature programed in them even when its hot out the will idle up off and on the comon rails arent soppused to sit and idle for long period so they will idle up time to time they also can be enabled to do this urself be using the cruise control switches but it has to be enable by the dealer