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6.7L Power Stroke Engine and Drivetrain Discussion of the 6.7L Power Stroke diesel engine and drivetrain in the 2011-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.7L Power Stroke engine.

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Old 11-25-2013, 08:44 AM   #1 (permalink)
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Cold Weather Idle

So this morning I go out to start the truck, in 15 degree weather.
The truck fires right up, but the idle goes straight to about 1200 RPMS and stayed there. This was my first cold weather start with the new truck.

Has any one else observed this, just wondering if it is normal or a problem.

Thanks
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Old 11-25-2013, 10:24 AM   #2 (permalink)
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Mine does the exact same
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Old 11-25-2013, 01:34 PM   #3 (permalink)
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Mine does the same
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Old 11-25-2013, 10:29 PM   #4 (permalink)
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It's normal. But it really does not produce much heat. Watch 5 min idle at 700 rpm and 5 min idle at 1100 rpm and the temps don't change much.
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Old 11-26-2013, 07:28 PM   #5 (permalink)
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Mine doesn't either,gonna use my block heater more this winter...
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Old 11-29-2013, 07:40 AM   #6 (permalink)
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Quote:
Originally Posted by duckstlflg View Post
So this morning I go out to start the truck, in 15 degree weather.
The truck fires right up, but the idle goes straight to about 1200 RPMS and stayed there. This was my first cold weather start with the new truck.

Has any one else observed this, just wondering if it is normal or a problem.

Thanks
It's normal if the temp is cold enough. I haven't had my Powerstroke in cold enough temps yet. My Duramax waited about 30 seconds or so before kicking in high idle. If it goes straight to high idle upon start I don't think that a great thing since oil hasn't even moved yet.
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Old 11-30-2013, 08:09 AM   #7 (permalink)
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It's normal. The truck knows it's cold and goes to high idle to assist with warm up.

I have a Ram 6.7 that you can move to high idle by pressing cruise control on then the set button. Moves idle to 1100 RPM.


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Old 12-08-2013, 12:21 PM   #8 (permalink)
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Cold start behavior

It's been colder than usual here in Rapid City lately and it's given me a chance to see what this motor does in the cold. Probably not as cold as some of you have seen but I found it interesting. Sitting all day at work, I started the truck in -5f temp with the oil temp also at -5f and it started right up no issue other than a slight diesel smell in the cab until I warmed up and started driving. The next day heading in to work it was -15f outside but the truck was plugged in and the oil temp at startup was +10f. Again started right up but this time I got the cold weather message "engine warming please wait 30 seconds".

Two questions: Does the PCM use OAT to determine starting strategy instead of ECT or EOT;where is this cut off -10f? I figured a plugged in engine wouldn't ask me to wait but a sub-zero oil temp start would. I couldn't find in the 6.7 bible.

Also, is the slight diesel odor in the cab normal on these 6.7s when it is really cold? Just cylinder wash? Looking for some similar experiences.

Either way. I plug her in to a timer when it's cold if I'm home and otherwise let it idle for 2-4 minutes to warm the engine at least a bit.
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Old 12-08-2013, 12:50 PM   #9 (permalink)
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I'm probably old school, but it's always bugged me how the new vehicles, whether car/truck, gas/diesel, seemed to fly wide open when it's blue cold.
I'd much prefer a reasonable delay to allow the oil to start flowing before they rev up.
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Old 12-08-2013, 01:31 PM   #10 (permalink)
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I'm probably old school, but it's always bugged me how the new vehicles, whether car/truck, gas/diesel, seemed to fly wide open when it's blue cold.
I'd much prefer a reasonable delay to allow the oil to start flowing before they rev up.
I have to assume engineers have thought of that too. There will always be residual oil in passages and around the top end components, and these engines build oil pressure very quickly - the 6.0's won't even start without high pressure oil being present, not sure if the 6.7's have that as well.

Either way, it won't be metal on metal or anything like that.
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Old 12-08-2013, 02:08 PM   #11 (permalink)
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I'm probably old school, but it's always bugged me how the new vehicles, whether car/truck, gas/diesel, seemed to fly wide open when it's blue cold.
I'd much prefer a reasonable delay to allow the oil to start flowing before they rev up.

Depending on temp, the 6.7, 6.4 and the 6.0 will not allow any fuel pedal input until a certain temp or idle time is allowed for.
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Old 12-08-2013, 03:02 PM   #12 (permalink)
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Good thing he never had an older Turbo RX-7. Those things redlined when started - all the way to around 11,000 rpm or so. (I forget exactly where the redline is, but it's motorcycle high) And of course you had to fill up with oil, before you filled up with gas in those too.

I gotta believe that the engineers thought of cold starting as well. I've only been in the teens in my truck a couple of times where the fast idle kicked in. Because of threads here, I don't idle it for long before we go as conventional wisdom now says that is a waste of fuel. Typically it idles for around a minute or so as we all get in and fasten our seatbelts.
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Old 12-09-2013, 10:13 AM   #13 (permalink)
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I live in Alberta and we have just had the coldest weather in along time. -34 AND WITH WIND CHILL -49. My diesel truck I noticed started up revving high 1500 and stayed that way for a long time. Now that I have read it here I see it is normal.
I am also wondering about the remote starter Ford has put on these trucks. I wonder if the glow plugs are being warmed up enough before it starts the truck (I have noticed there is not much of a delay after pushing the start button)in this cold or warm weather.
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Old 12-09-2013, 01:54 PM   #14 (permalink)
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That's normal on the glow plugs, they will heat to over 2,000* F in 2 seconds. In the temps we have around here you really have to pay attention when you turn the key on if you want to see the GP light.
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Old 12-09-2013, 02:02 PM   #15 (permalink)
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That's normal on the glow plugs, they will heat to over 2,000* F in 2 seconds. In the temps we have around here you really have to pay attention when you turn the key on if you want to see the GP light.

If I understand you correct, your saying even though it is -30c or colder, it is normal for remote to just start the truck. My friend has a dodge and he has to wait a good minute before the glow-plug light goes out. I don't want to damage my plugs.
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