rough idle and blue smoke on cold start up? - Diesel Forum - TheDieselStop.com
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6.0L Power Stroke Engine and Drivetrain Discussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. 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 6.0L Power Stroke engine.

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Old 11-15-2011, 05:21 AM   #1 (permalink)
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rough idle and blue smoke on cold start up?

truck will idle rough and i get a puff of light blue diesel smelling smoke on cold start up under 60degrees outside.Rough idle will last for about 20sec same with blue smoke and then clear up.I live in Nh and i run rotella 15w40 all year.Any help would be great.Oh yeah 2005 f-350 with 30k on new ford reman which came with new injectors,oil cooler,egr cooler also.
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Old 11-15-2011, 12:09 PM   #2 (permalink)
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bought my 2005 just back in June, so I'm only on my second oil change and just recently experiencing cooler weather with a diesel for the first time. My original oil change I used Rotella T 15w40 and when the weather started cooling off, I had a couple of days where I had the symptoms you're describing. I changed to Rotella T6 5w40 a few weeks ago and it seems to have fixed it.
I guess it would also be good to know what your FICM voltages are just to be thorough.
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Old 11-15-2011, 12:26 PM   #3 (permalink)
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Sound like stiction need to use a top grade 5w40 Syn oil use Ford filters only only 5000 miles on oil changes run cetane boost in the fuel i use the Ford stuff helps keep the egr valve and turbo clean. You might try this in the oil they say it works wonders REV-X Oil Additive | Diesel Fuel Additive | High Performance Oil
http://www.alliantpower.com/pdf/APTB-0109-watermark.pdf
2 stroker
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Old 11-15-2011, 05:02 PM   #4 (permalink)
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Also test your ficm.
FICM Testing Videos

With only 30,000miles on the injectors I am doubting that it is stiction, could be stiction, but I doubt it.
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Old 11-15-2011, 08:06 PM   #5 (permalink)
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so you guys recommend 5w40 in the winter and switch back to 15w40 in the summer and is there any other brand other than rotella that you recommend?
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Old 11-15-2011, 08:21 PM   #6 (permalink)
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5w year around. It's now Ford approved. Your injectors will thank you.
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Old 11-15-2011, 08:25 PM   #7 (permalink)
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No need for switching between 5w-40 and 15w-40. Stick with 5w-40 unless you want the cheaper price of 15w-40.
dello
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cant think of any others off the top of my head that are sold at common local stores, but they are all good.
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Old 11-15-2011, 08:59 PM   #8 (permalink)
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No need for switching between 5w-40 and 15w-40. Stick with 5w-40 unless you want the cheaper price of 15w-40.
dello
mobil
chevron
rotella
cant think of any others off the top of my head that are sold at common local stores, but they are all good.
Mystic
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Amsoil
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Old 11-15-2011, 09:22 PM   #9 (permalink)
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I've been running 5w-40 (Rotella T6, Mobil 1 for Turbo Diesel Trucks and Delvac 1) in my 2005 since 2005.

There is no reason whatsoever to change to 15w-40 during summer. Your batteries, starter, FICM and injectors will all last longer when your engine pumps 5w oil on cold starts. That's cold starts in winter as well as summer.

I've read countless threads about guys plugging in block heaters at +45F. Really? Try 5w-40 instead. I've cold soaked my truck at -25F for 8-10 hours several times here in Northwest Wyoming without plugging in the block heater and have experience no starting issues.

Twice after a -25F 10 hour cold soak I started my truck at the same time another 6.0 was starting his. Both times the other truck cranked for a while and wheezed to life bucking and jumping around. It was painful to watch and hear. Once, the driver came up to me and asked how I got my truck to start so quickly and run smoothly. I asked what oil he was using. 15W-40 conventional.

Using 5w-40 is the easiest cheapest thing you can do to enhance the reliability of your truck. The second is keeping your batteries hooked to a Deltran Battery Tender.
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Old 11-16-2011, 06:28 PM   #10 (permalink)
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I am having cold start issues as well. Here is my story......
Back in early 2010 I started having these cold start/rough running issues. I put up with it for quite some time and when winter came along I had to do something so I researched here and found out about the heat indtuction flash. I had that done in December 2010 and it cured my cold running issues, plus now the VGT cycles while idling to prevent the vanes from sticking.
Late this summer it started doing it again and for the last three tanks of fuel it has been even intermittently missing under load with the engine warm. Sometimes it will do it sometimes it wont when warm but ALWAYS when it has sat and cooled down.
So I start rersearching here again and decide I better test my batteries and my FICM.
Here are my results from last night......
Batteries Key off - 12.5 v
FICM Key on engine off - 48.5 v
FICM engine running - 48.4 v

So, where do I go from here? I am running Mobil Delvac 15W-40, and just changed it 3 weeks ago. Should I dump it and go with 5W-40 Synthetic? I also changed fuel filters last Friday. Should I take it to the dealer to see what they can find with a scan?
Any help would be greatly appreciated.
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Old 11-16-2011, 06:53 PM   #11 (permalink)
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I have been running Mobil Delvac 15W-40 in my 97 way back when it was a 1200 series now it is a 1300 series but the old 7.3 is not a 6.0 if your ficm checks out i would switch as in my post above and try the Rev-X they say it works. I run a 15w40 in my 7.3 and 5w40 in my 6.0 and they both run great when it is cold the 6.0 injectors do not like a heavy oil because these motors move a lot of oil at startup and while running.
2 stroker
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Edge Insight CTS with Expandable pyro
AutoMeter Fuel Pressure Gauge 0-100
Sinister Fuel Pressure Adapter
Updated Fuel Reg. Kit 3C3Z-9T517-AG
WOT 58lbs Idle 62-64lbs Just Right
HFCM Water Separator Drain Plug Upgrade
Ford Cetane boost every fillup
Amsoil By-Pass(Amsoil 5w40)
Fumoto Oil Drain Valve
Dieselsite Coolant Filtration System
Dieselsite Boots
Delo ELC Coolant
Tow Command
Upfitter Switches
Pulling a 14,000 lb Alpenlite 5er
Roll-N-Lock bed cover
97 F350 4x4 PSD CC LB (sold it)
1700 Super Chip
PacBrake&ATS converter lockup
3" dp-4" exhaust
TruCool 28,000 lb cooler
Tymar Intake
A pillar EGT,Boost,Trans
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Old 11-17-2011, 07:06 AM   #12 (permalink)
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Quote:
Originally Posted by 2 Stroker View Post
I have been running Mobil Delvac 15W-40 in my 97 way back when it was a 1200 series now it is a 1300 series but the old 7.3 is not a 6.0 if your ficm checks out i would switch as in my post above and try the Rev-X they say it works. I run a 15w40 in my 7.3 and 5w40 in my 6.0 and they both run great when it is cold the 6.0 injectors do not like a heavy oil because these motors move a lot of oil at startup and while running.
2 stroker
Good info, thanks.
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