Cold Weather Idle - Ford Powerstroke Diesel Forum
General 6.7 Discussion (2017-2019) General 6.7 Discussion

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post #1 of 29 Old 12-11-2019, 10:31 AM Thread Starter
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Cold Weather Idle

So I notice now that we are dropping into winter temps that my idle on start up is raised as expected. However, it is not coming down when I hit the brake peddle like my 6.0l. Is this common or should I be investigating a possible issue? I also have not noticed it ramp up the idle to keep itself warm when idling in freezing temps like the 6.0l does.
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post #2 of 29 Old 12-11-2019, 11:12 AM
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ahhhh....it seems like the 6.0 lives in infamy again.

I believe the old 6 leakers went into high idle to combat emissions. These new scorpions have the government fluid therefore 4,000 RPM idle is not needed.

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post #3 of 29 Old 12-11-2019, 11:29 AM
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I've noticed this quite often in the past. It seems to be more associated with the EOT and ECT than anything else. I have noticed that the idle will easily drop down as ECT rises from 30* to 40* to 50* to 60*. Once the motor achieves "normal temps" I don't see why it needs to high idle especially if you leave the motor running.



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post #4 of 29 Old 12-11-2019, 11:40 AM Thread Starter
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I guess once it is over a certain threshold it makes sense that it will not need to ramp up. My concern is that I can't get it to idle down before I shift into gear.
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post #5 of 29 Old 12-11-2019, 11:46 AM
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id think anything under 1,000 RPM should be fine.

I hear ya though. That 6.0 would start barking high idle and the neighbors would come out of their houses with a pitch fork.

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post #6 of 29 Old 12-11-2019, 12:02 PM
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@cmF250 : Same experience here, but never any issues down the road. That's why I suspect it's all related to the EOT/ECT temps.



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post #7 of 29 Old 12-11-2019, 01:30 PM Thread Starter
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Okay, thanks for the replies.
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post #8 of 29 Old 12-11-2019, 02:00 PM
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The automatic high idle will only disengage when the truck is shifted into gear. I thought it was weird too at first but it’s how these bad boys operate. Completely normal.
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post #9 of 29 Old 12-12-2019, 07:51 AM
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Quote:
Originally Posted by TeddyD View Post
The automatic high idle will only disengage when the truck is shifted into gear. I thought it was weird too at first but itís how these bad boys operate. Completely normal.
This is correct. My '02 7.3 bumps down as soon as you hit the brake pedal but my '14 doesn't until I shift into gear. I'm actually not sure why they changed it, because to me it makes sense to drop it down before the shift, but it works.
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post #10 of 29 Old 12-12-2019, 08:20 AM
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what kinda RPM are you guys seeing?

If its like my wifes 02 jeep grand cherokee with the legendary 4.0 inline six, that thing loves the RPMs on a cold start. Blows all that moisture out of the muffler till shes calmed down and warmed up.

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