High Idle update!
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Tuned
Joined: Jan 2005
Posts: 433
Likes: 57
From: Bridgewater Ma
High Idle update!
So my high idle finally kicked in!! Started my truck 2 days ago to let it warm up before heading off to work. It was 6 degrees out and 1 second after it started high idle kicked in. I was used to my old truck (2005) it would high idle at 25 degrees out. I guess the 2017's are a little different? Anyways I was pretty happy it kicked in. 
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Tuned
Joined: Jan 2005
Posts: 433
Likes: 57
From: Bridgewater Ma
Yup my 05 glow plugs would stay on for 6-7 seconds in 32 degree weather. My 2017 at 6 degrees out shut off at 2 seconds. I was shocked!
Laughing Gas
Joined: Jul 2010
Posts: 859
Likes: 10
From: North Carolina
40 or lower for me. If I remote start it in the morning I hear the idle settle after about 5 minutes. Unlike the diesel, the 6.2 will go into gear while in high idle. The other night I got toned out for a structure fire and the truck went into gear and drove as soon as I started it (mid 20's or so). My last truck, a 6.7, I had to wait until the computer let me put it in gear when it was cold.
Tuned
Joined: Nov 2017
Posts: 462
Likes: 0
40 or lower for me. If I remote start it in the morning I hear the idle settle after about 5 minutes. Unlike the diesel, the 6.2 will go into gear while in high idle. The other night I got toned out for a structure fire and the truck went into gear and drove as soon as I started it (mid 20's or so). My last truck, a 6.7, I had to wait until the computer let me put it in gear when it was cold.
Laughing Gas
Joined: Jul 2010
Posts: 859
Likes: 10
From: North Carolina
HEY! There's a difference between what the PCM does when it's cold out, and the high idle mod that lets the user put the engine in high idle mode (diesels only) for PTO use or long idle times. I know in the 11-16's it was just a matter of adding a resistor to certain PTO and upfitter wires and tying it all in to the upfitter switch of your choice. Not sure if this is how the 17's work as I went back to the gas motor. The cold weather high idle controlled by the PCM is a starting strategy that runs the idle higher than normal to get oil to the top of the motor and warm the engine up in general when the temps drop.
Fleet Mechanic
Joined: Sep 2016
Posts: 1,613
Likes: 156
there seems to be no rhyme or reasoning to when mine kicks on. it seems like it is random. can't pin point at what temp it comes on. and it only idles at 1000-1100 rpm. definitely not like the high idle on my old Rams or GMC
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Tuned
Joined: Nov 2017
Posts: 462
Likes: 0
HEY! There's a difference between what the PCM does when it's cold out, and the high idle mod that lets the user put the engine in high idle mode (diesels only) for PTO use or long idle times. I know in the 11-16's it was just a matter of adding a resistor to certain PTO and upfitter wires and tying it all in to the upfitter switch of your choice. Not sure if this is how the 17's work as I went back to the gas motor. The cold weather high idle controlled by the PCM is a starting strategy that runs the idle higher than normal to get oil to the top of the motor and warm the engine up in general when the temps drop.
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