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Discussion Starter · #1 ·
I purchased my 2006 Mega Cab 4X4 about 2 months ago. It had 42,xxx miles when purchased. I have put about 3,000 miles on it. It has a 4" lift and 35" tires and a turbo back exhaust upgrade. As best i can tell all else is stock. I have owned several Ford and Chevy Diesels, but this my first Cummins, so I am just not sure if some of what i am noticing is mormal.
First after several minutes of ideling it seems to start running a bit rough, not anything that the tach picks up, just a a slight rough feel.
Second, after prolong low load conditions like ideling or down hill driving, when you get into it I get a good bit of smoke, not black, more of a dark grey.
Third, it seems to lug at time if you drive it easy, it seems to want to be driven hard, it will drop down to 2nd and them jump right back to 3rd, and sometimes the shifts are harsh.
I did a car fax prior to purchase and the truck looks like it just came off the show room floor. I did find in dealer history one service record that the truck was reflashed about a year ago.
Is what i discribed sound normal to you guys or could there be some issues that i should be concerned with.
Thanks in advance for you thoughts.
 

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I dont know if this would help any, but

find a trailer and load as much weight on it as you can, dump about 16oz of power service into a tank thats about 3/8's to 1/4, then find a hill that is long and steep.

do a few full throttle passes up the hill. this will get cylinder pressures and temps up high enough to burn any carbon off the injectors, pistons, and exhaust valves.

the two sled pulls I entered in it felt as if my truck ran like a scalded cat for a few months afterward. not sure what the EGT's were, but I do know my gage peaks out at 1550F and the needle was a good bit higher than that :D

these engines like to be worked hard, this is what they live for. working them from tiem to time puts them into their element. granted they might not be the fastest thing on the road stock, but they sure will pull the road up in stock form.
 

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:ditto::ditto: My truck was starting to run a little rough as I haven't been pulling much lately so I hooked up to a good 15,000lbs and pulled a 7% grade that was 5 miles long and pushed it till my egt's were holding at about 1350* with a peak of about 1550* I'm now seeing almost 1 mpg better and runs alot smoother and quiter -- you really have to work these things once in awhile. By the way it took about half way up the first hill to clear up the exhaust lots of black smoke until then but its much happier now.:lol4:
 

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Discussion Starter · #4 ·
Well, so far it sounds like I need to stop driving like an old lady and put my foot into this thing once in a while.
It also sounds like I should install a EGT gauge.

Thanks for the advise
 

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Well, so far it sounds like I need to stop driving like an old lady and put my foot into this thing once in a while.
It also sounds like I should install a EGT gauge.

Thanks for the advise
I just let my wife drive mine... On one summer vacation trip I got woken up from a hard bump after having let her take the wheel for a while. She was kicked back cruising at 95 mph, with my 650 lb FJ1200 in the bed and an 8000 lb travel trailer in tow. Her excuse was she forgot the trailer was there...
 
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