i82much

Not that anyone gives a crap, but I need to adjust the choke on my Holley double pumper one of these days.

horsepower under the curve is all that matters. torque numbers are only relevant to the extent that they tell you something about the shape of the curve, since the tq number is specified at a particular rpm (and therefore hp can be derived at the tq peak as well). a 6.0 with 200 additional horses from a supercharger will smack a stock duramax around all day long ... until it breaks.

I did some reading, I think it is the TCC. When I first bought the truck, I did a few controlled panic stops to see how it handled and the engine stalled once. Apparently that is a TCC symptom. We will see what the dealer says.

That sounds exactly like my issue.

I almost never have my ac off! cools me in the summer, dries the air in winter. i was going windows down for awhile there but a damned yellow jacket flew in the window and stung me in the head, so back to the ac!

I have a 2016 6.0 2500HD. It seems to hesitate, kind of like a lean miss, at around 1/3 throttle, particularly going uphill and staying in a lower gear. It isn't terrible. Truck is still well within the warranty, but I was curious if anyone else has experienced this just so I can have some ideas going into the dealer for warranty service. I've heard the 6L90 can do some weird things that feel like an engine miss, so perhaps this is not really an engine issue.

thank you, good to know. maybe being a cheapskate will work out for me this one time!

Did we ever conclusively determine whether this issue is caused or exacerbated by the digital steering assist?

Stop! You are wasting your money. I had the old 4.3 Vortec and I never *needed* more power, your truck is a rocket compared to my old one. If you want a faster truck, buy a truck with a bigger engine. You aren't saving any money buying a 4.3 truck and then putting money in it to mod it, and you sure as heck aren't saving money if you do an engine swap. If you've just got to mess with something, buy an old square body or earlier truck and mess with it. Keep the hood closed on your new truck and that way you'll always have something that will start and get you where you need to go.

If you have a link to a build thread for the '04, I'd be interested to see how it's going. I was even looking at one of those under the hood roots blowers for my 72, but I decided not to mess with it because I use it to plow my driveway. I can't even get the damned choke adjusted correctly, the last thing I need is to be under the hood effing with a supercharger with 8 inches of snow on the ground. I'm definitely not wise yet, but at least I'm a little less stupid!

Oh I hear you. In some ways I am jealous because I've never worked on anything newer than 1972, at least never intentionally upgraded anything newer. But at the same time it all kind of freaks me out, with all the computer codes and wiring and craziness under the hood. I've spent hours just trying to get a throttle cable adjusted correctly, if I ever worked on a rig and the dash started flashing a code at me I think I'd shoot the damned thing!

I dunno, man. I learned a long time ago not to mess with anything I need to run the next day. I've got an old tractor, a 65 GTO, and a 72 K10, I wrench on them all the time. But no matter how careful you are, eventually you are going to do something wrong and have downtime or, more likely, get halfway into a job and realize you need some part you can't get for a few days. Then you are hosed if you really need your truck. I look at my 2016 2500HD in the driveway and of course I want to lift it, tune it, put a supercharger on it, paint it like Bigfoot and drive over Hondas in the parking lot. I mean, I'm old, not dead for crying out loud. But thankfully, at least one of my other pieces of junk is always broken so I work on that instead. As a consequence, my new truck always starts right up and goes where I point it, because the guys at GM that built it are a heck of a lot better at this stuff than I am!

Missing some trim in this pic but you get the idea.

completely off-topic, but does your username have anything to do with pontiacs?

yeah the 4.10 vs 3.73 is less than .5 mpg difference.

i have two carbureted vehicles. my 6.0 is pretty fancy by my standards.

It depends on the reid vapor pressure and the static gravity of the fuel you are using. See, the volatility varies with temperature and cetane, and this can cause a gelatinous mass to form under very specific barometric and temperature conditions. Of course this is all altitude-dependent and partly a function of the filtration scheme used by the refinery. As long as the pressure density of your fuel stays below the Kelvin coefficient under the specific conditions you are trying to start your vehicle, you should be fine. Just kidding, I haven't got a freaking clue.

3.73 will get a smidge better fuel economy. http://media.gm.com/media/us/en/gm/home.detail.html/content/Pages/news/us/en/2012/Aug/0817_gmc_differential.html

if you are not towing, just hauling heavy stuff in the bed all day long, 3.73 makes more sense.

thanks for all the info!

curious how much you spent in repairs on the duramax over the years you owned it, and how many miles? the 6.0 saves you money in up-front cost and typically cheaper repair bills, you spend your money at the gas station instead of at the dealer or a repair shop.

i have factory io3 with backup on a 2016 2500hd.

with the internet, it does not matter what new vehicle you buy - there will be some problem that gets a lot of attention. you do not want to worry needlessly or worse yet trade your truck in, since you will just find that the new model you get has some other problem that people keep talking about. the gm hd trucks, particularly the gassers, are about as trouble free a vehicle as you can buy. enjoy your trucks and if your steering gets loose,have it fixed. end of story.

3/4 work truck 6.0 with snugtop hi liner.

I think it is the torque management and/or the drive by wire programming. Does it seem slow when you shift manually and put your foot to the floor, letting it rev to the limit? If not, then the engine has the power you want and you need to figure out why it isn't giving it to you when you want it. Could be something a tune would solve.