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#4639385 - 01/18/18 10:21 PM Cold temps cause a diesel to have a more lopey idl
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4857
Loc: Houston, Texas
I've always noticed on my truck that when it's cold out and you let it idle for more than 5 minutes or so that the idle gets a little bit choppier. This is when the engine is warm. The truck still runs smooth and everything.
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4639386 - 01/18/18 10:21 PM Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4857
Loc: Houston, Texas
Seems to do it when the get drops to about 250
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4639404 - 01/18/18 10:39 PM Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman]
Snagglefoot Online   content


Registered: 12/31/17
Posts: 1724
Loc: Alberta
We did a post on Jan 8, 2018. It was entitled “Oil for cold starting diesels”. It talked about more than just oil, but what viscosity oil are you running and is it conventional or synthetic? If it’s the 15-40 you have at the bottom of the page, that’s part of the problem.

SF


Edited by Snagglefoot (01/18/18 10:41 PM)

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#4639410 - 01/18/18 10:42 PM Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4857
Loc: Houston, Texas
15w40 but I'm talking about even once it's warmed up it has more of a lope compared to the outside temps being in the 90s
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4639420 - 01/18/18 10:50 PM Re: Cold temps cause a diesel to have a more lopey idl [Re: Snagglefoot]
clinebarger Offline


Registered: 12/19/13
Posts: 1912
Loc: Fort Worth, Texas
Originally Posted By: Snagglefoot
We did a post on Jan 8, 2018. It was entitled “Oil for cold starting diesels”. It talked about more than just oil, but what viscosity oil are you running and is it conventional or synthetic? If it’s the 15-40 you have at the bottom of the page, that’s part of the problem.

SF


15w40 is not an issue in Houston, Texas.
_________________________
2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/Auto

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#4639424 - 01/18/18 10:54 PM Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman]
Snagglefoot Online   content


Registered: 12/31/17
Posts: 1724
Loc: Alberta
Some might argue all diesels do this in the cold but I have one piece of advice. I checked the owners manual the 2007 Dodge Cummins 6.7 . Your owners manual says at cold temps you can use 5W-40 motor oil and that it’s OK to use synthetic oil. I would like to suggest 5W-40 synthetic oil for diesels. Delo probably has it.

SF


Edited by Snagglefoot (01/18/18 10:54 PM)

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#4639427 - 01/18/18 10:59 PM Re: Cold temps cause a diesel to have a more lopey idl [Re: clinebarger]
Snagglefoot Online   content


Registered: 12/31/17
Posts: 1724
Loc: Alberta


SF [/quote]

15w40 is not an issue in Houston, Texas.[/quote]

36 F tonight in Houston. Just sayin.

SF

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#4639441 - 01/18/18 11:17 PM Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman]
Snagglefoot Online   content


Registered: 12/31/17
Posts: 1724
Loc: Alberta
Originally Posted By: motor_oil_madman
15w40 but I'm talking about even once it's warmed up it has more of a lope compared to the outside temps being in the 90s


Your diesel fuel is still cold. Probably not atomizing as well or if you check out that posting I described, some guys had advice on mechanical items.

SF

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#4639479 - 01/19/18 01:05 AM Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman]
Johnny2Bad Offline


Registered: 05/20/13
Posts: 1810
Loc: Saskatchewan, Canada
Diesel fuel doesn't like cold temperatures and it's various properties are temperature-dependant. Since the fuel is coming from storage, whatever ambient temperature your fuel tank is at will affect it's combustion properties; not engine operating temperatures. Truckers and heavy equipment operators use diesel fuel conditioners to make diesel happier with cold temperatures.
_________________________
'57 FL Straight 50 wt
'90 Miata 1.8L w/Rotrex Supercharger [Mobil1 0W-40]
'96 Ram 1500 [3.7L Mobil1 0W-20 / 1L 15W-50]
'01 PT Cruiser [Mobil1 0W-40]

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#4639508 - 01/19/18 02:22 AM Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4857
Loc: Houston, Texas
Makes sense. That a long with the combustion temps getting low again after 5 or 6 minutes probably doesn't help either.
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4639512 - 01/19/18 02:31 AM Re: Cold temps cause a diesel to have a more lopey idl [Re: Snagglefoot]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4857
Loc: Houston, Texas
Originally Posted By: Snagglefoot


SF


15w40 is not an issue in Houston, Texas.[/quote]

36 F tonight in Houston. Just sayin.

SF

[/quote]


It normally isn't this cold. We were sitting at 25-30 degrees for like 3 days straight. Usually it only does that for a night or two this time of year and even that only happens every 2 or 3 years. So I don't experience this choppy idle issue that often. The other day it got down to 19 over night and when I went to drive the truck in the morning it made the loudest noise when I put it in reverse. Parts of the drivetrain were frozen together. Lol I think it was mainly the tires though.


Edited by motor_oil_madman (01/19/18 02:35 AM)
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4639580 - 01/19/18 06:30 AM Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman]
dave123 Offline


Registered: 01/13/09
Posts: 2314
Loc: wi
It's comical to listen to a guy from the south talk about what he thinks is cold it always make my day.

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#4639609 - 01/19/18 07:22 AM Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman]
bullwinkle Online   confused


Registered: 10/09/04
Posts: 7668
Loc: Cincinnati, OH, USA
Originally Posted By: motor_oil_madman
Makes sense. That a long with the combustion temps getting low again after 5 or 6 minutes probably doesn't help either.
Your Ram has the same feature mine does-when it's not fully warmed up & allowed to idle more than a minute or two it raises the idle RPM to 1000 and starts firing on every other cylinder, which allows the engine to warm up without "wet stacking" and contaminating the oil with excess fuel.
_________________________
06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 15 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)

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#4639637 - 01/19/18 07:45 AM Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4857
Loc: Houston, Texas
The common rails don't do the every other cylinder thing. It will raise to 1000 rpm but it's still firing on all cylinders. If it's real cold it will go straight to 1000rpm as soon as it starts.
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4639681 - 01/19/18 08:37 AM Re: Cold temps cause a diesel to have a more lopey idl [Re: dave123]
MNgopher Offline


Registered: 09/17/02
Posts: 4042
Loc: Lakeville, MN
Originally Posted By: dave123
It's comical to listen to a guy from the south talk about what he thinks is cold it always make my day.


Amen! It made it back up to 40 yesterday and it felt like a heat wave. Driving with the window partially open.. smile I was thinking about how easy the truck had it, and my auto start stop even engaged since it had warmed up enough smile

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