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Cold temps cause a diesel to have a more lopey idl #4639385
01/18/18 10:21 PM
01/18/18 10:21 PM
Joined: Nov 2009
Posts: 5,126
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 5,126
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.

Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman] #4639386
01/18/18 10:21 PM
01/18/18 10:21 PM
Joined: Nov 2009
Posts: 5,126
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 5,126
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.

Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman] #4639404
01/18/18 10:39 PM
01/18/18 10:39 PM
Joined: Dec 2017
Posts: 3,027
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 3,027
SE British Columbia, Canada
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

Last edited by Snagglefoot; 01/18/18 10:41 PM.

If you want the job done right......do it yourself.
Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman] #4639410
01/18/18 10:42 PM
01/18/18 10:42 PM
Joined: Nov 2009
Posts: 5,126
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 5,126
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.

Re: Cold temps cause a diesel to have a more lopey idl [Re: Snagglefoot] #4639420
01/18/18 10:50 PM
01/18/18 10:50 PM
Joined: Dec 2013
Posts: 2,453
Fort Worth, Texas
clinebarger Offline
clinebarger  Offline
Joined: Dec 2013
Posts: 2,453
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/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman] #4639424
01/18/18 10:54 PM
01/18/18 10:54 PM
Joined: Dec 2017
Posts: 3,027
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 3,027
SE British Columbia, Canada
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

Last edited by Snagglefoot; 01/18/18 10:54 PM.

If you want the job done right......do it yourself.
Re: Cold temps cause a diesel to have a more lopey idl [Re: clinebarger] #4639427
01/18/18 10:59 PM
01/18/18 10:59 PM
Joined: Dec 2017
Posts: 3,027
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 3,027
SE British Columbia, Canada


SF [/quote]

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

36 F tonight in Houston. Just sayin.

SF


If you want the job done right......do it yourself.
Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman] #4639441
01/18/18 11:17 PM
01/18/18 11:17 PM
Joined: Dec 2017
Posts: 3,027
SE British Columbia, Canada
Snagglefoot Offline
Snagglefoot  Offline
Joined: Dec 2017
Posts: 3,027
SE British Columbia, Canada
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


If you want the job done right......do it yourself.
Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman] #4639479
01/19/18 01:05 AM
01/19/18 01:05 AM
Joined: May 2013
Posts: 2,160
Saskatchewan, Canada
Johnny2Bad Offline
Johnny2Bad  Offline
Joined: May 2013
Posts: 2,160
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]
Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman] #4639508
01/19/18 02:22 AM
01/19/18 02:22 AM
Joined: Nov 2009
Posts: 5,126
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 5,126
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.

Re: Cold temps cause a diesel to have a more lopey idl [Re: Snagglefoot] #4639512
01/19/18 02:31 AM
01/19/18 02:31 AM
Joined: Nov 2009
Posts: 5,126
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 5,126
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.

Last 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.

Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman] #4639580
01/19/18 06:30 AM
01/19/18 06:30 AM
Joined: Jan 2009
Posts: 2,473
wi
dave123 Offline
dave123  Offline
Joined: Jan 2009
Posts: 2,473
wi
It's comical to listen to a guy from the south talk about what he thinks is cold it always make my day.

Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman] #4639609
01/19/18 07:22 AM
01/19/18 07:22 AM
Joined: Oct 2004
Posts: 8,331
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline
Joined: Oct 2004
Posts: 8,331
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), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: Cold temps cause a diesel to have a more lopey idl [Re: motor_oil_madman] #4639637
01/19/18 07:45 AM
01/19/18 07:45 AM
Joined: Nov 2009
Posts: 5,126
Houston, Texas
motor_oil_madman Offline OP
motor_oil_madman  Offline OP
Joined: Nov 2009
Posts: 5,126
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.

Re: Cold temps cause a diesel to have a more lopey idl [Re: dave123] #4639681
01/19/18 08:37 AM
01/19/18 08:37 AM
Joined: Sep 2002
Posts: 4,179
Lakeville, MN
MNgopher Offline
MNgopher  Offline
Joined: Sep 2002
Posts: 4,179
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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