3rd Gen Engine and Drivetrain -> 2007 and up 6.7 liter Engine and Drivetrain discussion only. PLEASE, NO HIGH PERFORMANCE DISCUSSION!

6.7 started running real bad

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Old Jun 11, 2007 | 09:44 PM
  #31  
Joe T's Avatar
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From: Texas
Yeah, I just read this for the heck of it... Anyway, just a thought when the Hemi came out they were having rough running problems at start up, almost same thing when you'd kill it then restart it it would run fine. Mine did it at 800 miles and I took it in and it was well known by this time so they just reflashed it. Fixed my problem and I didn't see people complaining about it anymore... Just a computer hiccup.
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Old Jun 11, 2007 | 10:08 PM
  #32  
GasganoFJ60's Avatar
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From: Stephenville / Harlingen Texas
Originally Posted by $oC@l CTD
Also, you are 100% positive that you put ULSD and didn't get some LSD snuck into the tank right? Just a thought...It doesn't seem to me that these trucks doing their regeneration process should put you in a limp like mode for ANY period of time. What if that happened when you were trying to pull 10k up an 8% grade?

It wouldnt be LSD in a ULSD engine. For 2007, the ULSD 6.7 is backwards-compatable. You CAN run LSD if you need to but it is highly recomended that you do. Its in the owners manual. My dad has run LSD in his 6.7 and it runs just fine. In fact, he gets better mileage when he runs LSD.
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Old Jun 13, 2007 | 01:43 PM
  #33  
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From: South Central Ohio
Is this "Most don't know that when in the regen stage you must drive the vehicle for 45 minutes and no less that 1700 to 1800 rpm's without interruption or the process will not complete itself. " true about the new 6.7L Cummins? If so, this is rediculess. Can you imagine getting home after being on the road all day, and the regen starts? According to this, you would have to go driving for 45 minutes to kill time. So much for good mileage from a diesel when you have to drive 30-40 miles for nothing...........
I got that information from TDR. Here is the complete post "The concerns are becoming more prominent with those who have high idle times, especially in areas of high altitudes. Although all the 6.7's do have this problem, some will not encounter it as soon or perhaps not at all before the issue is resolved simply because we use our trucks differently and live in different regions. Most don't know that when in the regen stage you must drive the vehicle for 45 minutes and no less that 1700 to 1800 rpm's without interruption or the process will not complete itself. The programming for the problems the injection system is coming and will resolve the issue. Secondly, never, ever use anything other than ULSD fuel. You will pay for it in the long run. Vehicle's using fuel from thier private tanks are more likely to have problems due to greater risk of contaminants. It is very important that the fuel filter be replaced as required by the manufacturer. Would suggest having a second fuel fliter and water seperator installed in-line prior to the main fuel filter. The fuel systems that the new 07"s have are much less forgiving. Also note that the injectors are cylinder specific and are programmed into the PCM with each having thier specific indentification number. Do not under any circumstances have a performance package upgrade/program installed."
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