Just trying to get some good numbers on everyone that has an LLY out there in regards to some of the problems we have been experienceing with injectors, idle, surge, mileage, reflashes, etc. I know theres a lot of us driving these around and im trying to put some good numbers together in regards to all that is happening. Thanks again

I have only had a reflash for a computer update. I guess that I would not consider that a "problem"...

So far, so good on my '04.5 LLY. First diesel I've owned, so I don't know any better whether or not it rocks or sucks compared to the LB7.

i had inector problems at 750 miles. had a reflash and it didnt work. immediatly after that i started using additive from the dealer. i have not had any problems since then and i am running juice/additude with no problems. i now have 2500 miles on truck.

No problems, but I can seem to notice performance changes between tanks of fuel so I figure I'll start using some type of additive. Our diesel mechanic at work says I'll really notice a difference when the winter fuel shows up at the pumps.

I agree a lot of problems can be due to fuel quality. And it always seems like a lot of people are having problems cuz they are the most vocal on the internet.

Should have had another option 'no problems w/ power adder'.

Just two injectors on mine otherwise been fun to drive especially with the TTS tow tune!

Also need - "Problems - NO MODS". This poll is designed to show only problems with mods and programs. Be interesting to see how many pure stock, no mods, no programs are having troubles. That would be much more tell tale as to whether problems are associated with mods and programs, or are strickly a GM problem which may be enhanced by mods and programs.

Tom, I like the gutless 05 http://www.dieselplace.com/forum/smileys/hihi.gif

thanks for the feedback guys - i guess i was in a hurry and left a couple off, i had wanted to put a lot more but thought i would condense it a bit - ill check into adding a couple more lines

I have disconnected EGR and noticed mileage dropping after 4 tanks or so... (that's another topic discussion I know...)

id like to get a good idea on all of this stuff were doing - air intake, egr mod, cat removal, programs, etc... what i noticed on mine was that it seemed like the LLY was very touchy and too smart for its own good, everytime i tinkered with something, eventually it would start running worse over time - not sure why, i can only gather that by changing certain parameters the pcm counteracts that by changing something else to compensate thus making the truck run worse ??

DMax Tim - When Steve Cole get a 05 TTS tow, that could change. I'd settle to getting my 02 power back. But in all fairness, I only have about 2500 miles on it.

What I noticed after adding the Hypertech is that it runs nice and smooth on settings 1 and 2 with lots of torque. On setting 3, it's very noticably faster but it's also very jerky and the tranny seems to want to shift and "hunt" all over the place. It doesn't really bother me, I'm used to driving a pretty radical street rod. But I noticed it when I was getting on it and I looked over at my wife, she had a pretty serious "What the Hell is wrong with this thing" look on her face! http://dieselplace.com/forum/smileys/smiley3.gif


I programmed it back to setting #2 and the thing ran much smoother. No black smoke either.

No problems here. I just got the reflash done yesterday and no more "fuel knock"!!! Finally I'm juiced again, yahoo!! http://www.dieselplace.com/forum/smileys/smiley4.gif

I have had the "rough idle" problem but it was fixed in August with an
eight injector replacement. My dealer has since done all the reflash
updates. I have ZERO MODS and NO PROGRAMMER. Never did. You
missed adding that option to the poll.

Got an oil leak just after 500 miles. Had it fixed and add a little Hp and all has been fine for 10,000 miles

No mods. Injector control module replaced at ~2500 miles. Now at 14000 getting 19-20 MPG unloaded. 14-15 towing 6500 lb. She goes like a scalded ape when I stomp on it. I love this truck.

I have a LLY and have a friend with one also........we're both at about 9,000 miles and no probs with either one, no mods for either of us.

Bone stock, no after market filters no additives Only fuel in 2 places around town I have had no problems with this truck. Oh I had a clock problem with it, was re-setting, dealer flashed computer. I'm still waiting to see if the high idle works it hasn't been cold yet to check it. GREAT TRUCK SO FAR!!!!! Edited by: Leatherman

I love this engine! http://www.dieselplace.com/forum/smileys/smiley32.gif


No problems at all.


Over 10,000 miles on it so far and I pull steep hills with heavy loads.

No mods, truck runs great. It may have the overheating problem when towing heavy, just haven't had the right conditions presented to overheat the truck yet. Otherwise very happy! JJ http://www.dieselplace.com/forum/smileys/smiley4.gif

Just a TTS Tow and Delete Cat, 20,500mi and AOK.

I love this truck, interior much better than the Ford and Dodge products I test drove IMHO. Don't you just love the smell of fresh Diesel fuel in the morning http://www.dieselplace.com/forum/smileys/smiley36.gif no more gassers for me!

Just completed a cross-country run from NE Nevada to N. Fl. Carried approx. 2,500 lb load, no tow. Highway speeds were between 70 and 75. Temps and humidity varied from freezing and 10% to 90 and 100%. 8,000 miles on unit and zero problems. Fuel usage was 17.9 mpg including two days in Las Vegas and Yuma traffic. The 8.1 gasser I had would deliver 12 mpg on same run. Very pleased with the LLY so far. She is just as stock as the day she came off the line.

I purchased my truck in July with the intention of towing my 1972 Z28 to the Drags. My thoughts was: dependabiliy and economy. Well, I didnt get my car to the drags this year but, I'm having a blast smokin Furds, Dogies, and import compacts.

http://www.dieselplace.com/forum/smileys/smiley17.gif14,000 miles, most of it pulling 14,000 lb 5th wheel. No problems !! http://www.dieselplace.com/forum/smileys/smiley17.gif Ran across scales the other day, frt 4,200 r 7,200 trailer axel 11,200. Pulls like a dream ! http://www.dieselplace.com/forum/smileys/smiley17.gif