Effects of high idle on trans

[TeaBagger2006]

I know when high idle kicks on it engages certain things in the Trans to load the engine. I'm curious since I had Mike build mine if high idling for long periods of time has any negative effects on a built Trans. It's so damn cold up here in the ND oilfields that the damn truck never seems to get off high idle.

 

[Mike L.]

C5 clutch is applied. Don't rev it up while in P/N.

 

[WVRigrat05]

Mike, my elevated idle has been running a lot as well, should it be off on an LBZ/LMM? Mine def heats the trans to 140* quick and keeps it there.

 

[Burn Down]

I know when high idle kicks on it engages certain things in the Trans to load the engine. I'm curious since I had Mike build mine if high idling for long periods of time has any negative effects on a built Trans. It's so damn cold up here in the ND oilfields that the damn truck never seems to get off high idle.

I have never had issues Joe... I'm a bit colder than most. I will say that the early LMM's had some issues with it. They would get so hot they were turning the converters blue, and torching the oil. Never heard of the other models doing this.

C5 clutch is applied. Don't rev it up while in P/N.

Mike, the high idle on my LLY is 1200 ish. I'm confused by what you mean about not reving it up in P/N?

 

[Pure Diesel]

Park/Neutral?

 

[Mike L.]

Park/Neutral?

Correct.

 

[TeaBagger2006]

But doesn't high idle deactivate when you depress either pedal?

 

[Cougar281]

I have never had issues Joe... I'm a bit colder than most. I will say that the early LMM's had some issues with it. They would get so hot they were turning the converters blue, and torching the oil. Never heard of the other models doing this.


Mike, the high idle on my LLY is 1200 ish. I'm confused by what you mean about not reving it up in P/N?

I think the LBZs had the same issue, but there was a calibration update for the TCM that addressed it. I believe the update made the truck run longer in extreme cold before allowing the elevated idle to kick in to allow the fluid to warm up a bit and be able to flow instead of being 'stuck' in the TC and cooking.

Sent from my 0PJA2 using Tapatalk

 

[Dart.340]

What about when using the bd high idle kit and not the factory truck option

My understanding is it's only applying slight throttle since my edge insight is registering 5-7% thtottle

 

[Burn Down]

I think the LBZs had the same issue, but there was a calibration update for the TCM that addressed it. I believe the update made the truck run longer in extreme cold before allowing the elevated idle to kick in to allow the fluid to warm up a bit and be able to flow instead of being 'stuck' in the TC and cooking.

Sent from my 0PJA2 using Tapatalk

Early LMM was the one that had so much trouble up here. I had heard of 20+ trucks with torched transmissions in Fairbanks alone.

I know my LLY won't even hit lock up (cold oil) until 5-6 miles down the road, even letting it run at high idle for 25 minutes.

 

[WVRigrat05]

Early LMM was the one that had so much trouble up here. I had heard of 20+ trucks with torched transmissions in Fairbanks alone.

I know my LLY won't even hit lock up (cold oil) until 5-6 miles down the road, even letting it run at high idle for 25 minutes.

My Lmm will go to high idle less than 30 sec after starting and it'll lock up at 50* trans temp.

 

[minerigger]

I'm also curious on this as well. I was worried about my fluid when it was -30 here but I sat a bottle outside and it still poured quite well imo for -30. But I also don't want to run elevated idle if there will be I'll affects. Come to think of it I need to search some stuff as when my engages I'm smelling stuff like it's hot/burning/melting. Not sure if it's in the cab or engine bay or what but just started this year. Either way I'd prefer to not cook a converter as mine will also go into elevated idle not even 30 sec after its started, doesn't matter if it was plugged in or not.

 

[fc8464]

It started in 06 with the LBZ. Was working at Aurora Motors then, had ton of them. My own 06 dually with the Suncoast TC turn blue. Got a new tranny So the Allison enginers could look at it. Sent the TC back to Sun coast to get rebuilt on the dealers dime. I thought some of the updated programing Kept the clutch from applying and lowered the high idle. I know we where draining the oil and putting Transcend in on all the new trucks.

 

[WVRigrat05]

What did they idle at? Mine idles at 1100 when cold and 900 when trying to keep warm.