High idle on at factory on '15's?

[Mingoglia]

After a month of ownership, I actually read the owners manual while I was bored yesterday. To my surprise, it has a section dedicated to the high idle. It says it must be turned on by the dealer. Although I've read others having this turned on, so I knew it existed, I was actually surprised it was physically printed in the manual.

With that being said, I took my '15 on its first day trip today and was at about 10,000' elevation and got out to take a leak. I figured if I had a chance of unburned fuel slipping past the rings it would be in relatively cool high elevation air so I figured I'd try the high idle just for the fun of it, knowing I haven't yet asked the dealer to turn it on. To my surprise, it worked! Turned on cruise, then held set for a couple seconds. Brought the idle gradually up to ~1,000 and kept it there. Once there, I could advance it with the "up" cruise control button, with each press getting me closer to a max of 1,500. Then the "down" button would bring it back down a step with each press, and so on.

Has anyone tried this on a brand new truck? Like I said, the manual said it had to be activated by the dealer, but mine worked without asking the dealer to turn it on. Perhaps this is something they're doing on the '15's, and just didn't update the manual to reflect the capability right from the factory?

 

[Alan Reagan]

It's factory activated. Mine was factory activated on my '11 as well. Since they check idle time every time it goes to the dealer, I use the high idle anytime I leave it running and I'm not in it.

 

[Brocky]

My 14 works on the cruise from the factory, also the high idle in cold weather start up.

 

[Mingoglia]

Not surprised the manual is wrong when it says it needs to be enabled at the dealer.

When you use the high idle, do you leave it at the 1,000 RPM setting, or do you ramp it up higher?

 

[Jim W]

My 08 high-idle runs at 1100 RPM and it is usually left there. This is enough to warm the truck up and keep it warm in the winter months.

And no the dealer did not have to activate the High Idle feature. I believe this was the case for the early 07.5 trucks that were first introduced in Jan 07.

Jim W.

 

[SnoKing]

You guys got it so easy! I was the pits to get the cold weather feature enabled on the 24V 2nd Gen trucks. You needed to take the instructions and sit in the truck with the tech to insure that he went to the correct page and turned it on after flashing the ECM. I got it enabled in second trip, many made more trips.

Then the first time it was cold enough for 3 cylinder idle you mess your shorts! If truck is idling on exhaust brake to aid warm up and 3 cylinder idle kicks in the motor dies!!!!

SNOKING

 

[Mingoglia]

You guys got it so easy! I was the pits to get the cold weather feature enabled on the 24V 2nd Gen trucks. You needed to take the instructions and sit in the truck with the tech to insure that he went to the correct page and turned it on after flashing the ECM. I got it enabled in second trip, many made more trips.

Then the first time it was cold enough for 3 cylinder idle you mess your shorts! If truck is idling on exhaust brake to aid warm up and 3 cylinder idle kicks in the motor dies!!!!

SNOKING

On my second gen, I just had a bracket which was attached to my seat, and a piece of all thread rod attached to an aluminum cup which was bent in a way to fit over the accelerator pedal. I'd put it in place and manually thread the all thread to apply the pressure I was looking for. This is how we did it "old school". The new owner of my 2nd gen probably wonders what the story is of the aluminum bracket bolted under the seat as I kept the other end for nostalgia purposes, along with my 14 year old TDR hood emblem and receiver hitch cover.

 

[kthaxton]

My '15 was enabled from the factory.

 

[AllianceDiesel]

I dont know how it work now but it had to be enabled by the dealer, And, it can still be that way. When we would do a pre delivery inspection, thats is one of the things we enabled as a courtesy to our customers. It only takes a couple of minutes.

The worst thing you can do to a diesel is idle it for long periods (over 10% of the engine run time). If I plan to idle mine for more than 30 seconds, I kick on high idle. And for those of you with 6.7s always run your exhaust brake. It will put an additional load on the engine.

 

[Mingoglia]

I dont know how it work now but it had to be enabled by the dealer, And, it can still be that way. When we would do a pre delivery inspection, thats is one of the things we enabled as a courtesy to our customers. It only takes a couple of minutes.

The worst thing you can do to a diesel is idle it for long periods (over 10% of the engine run time). If I plan to idle mine for more than 30 seconds, I kick on high idle. And for those of you with 6.7s always run your exhaust brake. It will put an additional load on the engine.

Are you suggesting having the exhaust brake on with the new trucks will have an effect even when sitting idle? I know this is common practice with after market exhaust brakes as it's literally just a flapper valve, but I'd imagine these fancy new exhaust brakes likely aren't engaged unless moving with the transmission locked up? I'm just theorizing here....

 

[AllianceDiesel]

It actually restricts slightly to but a load on the engine at idle. You really have to listen to hear it. But you really hear it on a deleted pickup.

 

[Mingoglia]

It actually restricts slightly to but a load on the engine at idle. You really have to listen to hear it. But you really hear it on a deleted pickup.

Interesting to know. Thanks for the response.

 

[Newsa]

When Does 3 Cylinder Idle Kick in? (In normal use)

 

[Mingoglia]

When Does 3 Cylinder Idle Kick in? (In normal use)

That was a second gen truck "thing".

 

[Newsa]

Can't get mine with the G56 to do it. I put on the parking brake and tried it with both transmission and transfer case in neutral. Wonder if it wasn't turned on or is waiting for the transmission to tell it that it's in Park?

 

[SnoKing]

Are you even sure the manual transmission trucks have the feature? I did not think so!!! SNOKING

 

[Brocky]

The fast Idle worked on manual transmission Series 60 Detroits. Apply the parking brake, turn on the cruise, and keep hitting the accelerate button up to where you wanted it.. Some of them also had a PTO setting you could select.. The only difference being that with air over spring parking brakes the computer would definately know that the parking brakes were set.. but it should (or can be) be wired into the parking brake dash lite circuit.

 

[RVTRKN]

Its not available with the manual anymore, at least mine was turned on at dealer for my 07 C&C from day 1. But there is info on that from Dodge somewhere about not being availble for the manual, when they deleted it from the manuals I can't tell you. I don't know why, if the E-Brake is not engaged it won't activate and as soon as you engage the clutch it releases the High idle.

 

[MoparBob]

It's factory activated. Mine was factory activated on my '11 as well. Since they check idle time every time it goes to the dealer, I use the high idle anytime I leave it running and I'm not in it.

If the truck is in "High Idle", does that not count as idle time in the computer?

 

[AllianceDiesel]

High idle is in the 11-20% load and that is the reason they want it kicked up is because regular idle is in 0-10% and isnt enough losd to build cylinder temps

I know on the 3rd gens you can ground out a wire undrr the dash and it will allow high idle to work on the manual pickups