Join Date: Mar 2010
Location: Kalamazoo, MI
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04 6.0 very sluggish compared to my old Cummins
I previously had a new '05 3500 Dodge with the 5.9 in it (and a 6-spd).
Now (as of Saturday) I have a well-used (and abused) bone-stock 2004 6.0 with 220k on it. It had new injectors at 110k (or so) and new glowplugs in the last year.
It blows no smoke - white, black, or any other color.
Truck seems VERY sluggish compared to my Dodge. I hear (and sometimes feel) the turbo, so I know it's working. Truck just doesn't feel like it's making the power it should.
The mileage is also a lot worse than my Dodge (like 12 vs. 18 for the same driving). Both trucks are "nearly" identical - 4WD crew-cab long-box dually's. Only my Dodge was a stick, and this truck is an auto (which seems to shift fine).
No idea what updates/flashes/TSBs it's had done (if any).
I've been poking around this forum and the internet reading and learning, but this thing is WAAAY more complex than my Dodge was!
Any help/advice would be greatly appreciated.