I had my truck in for the complaint of the surge at idle in gear. Had the reflash done, problem went away. It has been about a month or so and now intermittantly will surge at idle and also when on highway at 2100-2200 rpm's. This occurs only when it is warmed up, 180 deg or above. It has 12000 miles on it now, replaced fuel filter and still does it. Do you think possible injector? I've made an appointment to take in to dealer. Just curious if any one else has heard or has this problem.


Thanks

ttt, anyone heard or have same problem? Truck goes in Tuesday.

JHD, mine did the same thing. I've not had it back to the dealer yet. Let me know what you find out.


Regards!

How bad is the surge problem cause I just notice a very slight surge on mine, not enough for me to worry about it though.


Just curioushttp://www.dieselplace.com/forum/smileys/smiley1.gif

Not to bad, but a bother when I'm trying to idle around a parking lot. I'm not happy with my truck and I'm thinking of trading for a Toyota gasser. Why can't US automakers make something worth a crap?

I didn't know Toyota made a truckhttp://www.dieselplace.com/forum/smileys/smiley2.gif I have sat I toyota's, Fords and Dodge and nothing drives or feels as good as a GM truck.





Greg

#2 and #3 injectors failed. Got it back yesterday, runs great now. Juice/Attitude and intake going back on tonight. No reason from dealer as to why failed. Changed my fuel filter at 12000 miles, they say to change at 15000 miles though. Thinking I should upgrade the fuel filtration. Injectors were in stock, I couldn't believe it. I've heard stories that the were hard to come by, I don't know if this is still the case.


JHD

How bad is the surge problem cause I just notice a very slight surge on mine, not enough for me to worry about it though.


Just curioushttp://www.dieselplace.com/forum/smileys/smiley1.gif





A 50RPM surge is normal. The PCM controls RPM to 50RPM. You would notice the surge more at lower rpms.

mine did the same thing (rough idle --> reflash --> rough idle --> #7 injector with high balance rates and replaced) now runs great.


Mike

I have had this problem (surging) since new. GM has replaced the high pressure pump-fuel pressure regulator assembly, reflash done, two injectors replaced, and many snapshots sent to GM. Still does it.

continue. My truck surges approx. 50 to 100 rpm in the 1200 to 1700rpm range. The last work order, GM says cease work no fix at this time it is a software issue. The truck is awful to drive around the construction site (50rpm surge okay BS) and the logging roads of B.C. Canada. It bucks and jerks and continues until you throttle it to spin the tires. This sends you off the seat as you hit the bumps.

continue. I phoned GM customer service to ask for a replacement truck (I have driven 3 other LLY equipped trucks that do not have these syptoms) or give me my money back ($62000.00 + 17% tax) and I will buy one when you have it fixed. They checked up on my truck and said sorry you and 11 other people have this problem but we willnot take your truck back (basically tough bananas).

continue. I talked to lawyers, and in Canada if your truck starts, stops, and takes you to work, it is not a breach of my contract with GM. My questions to you are: #1 are the majority of GM owners so brand loyal that they put up with this condition (do not be afraid your truck will not know) The reason I put it this way is because if this is a software issue then all LLY motors should show this symptom to some degree. #2 do any of the boxes (chips, downloads) make these LLy motors run the way they should (no need for way more power) (it would be nice to talk to someone who felt this problem and cured it, box or whatever) #3 if anyone has had a similar (can not be fixed now) problem with GM Canada and figured out a resolution. Thanx George K. 2004.5 Chev CCLB 4x4

continue. first post. Thought I would give some history so people would understand where I am coming from. I was a mechanic progressed to service manager (dealership) for 18yrs of my life. Left that trade for the money and started my own construction co. (digging and pipe). It has gone well. I have had 6 Dodge diesels in the last 11yrs. Decided on a change and based my decision on a test drive in a LB7 (nice engine) equipped truck. I figured, LLY, more power, more better, eh!. GM missed the boat on this engine management system. I would be willing to wait for a fix (if GM is really working on one), but if it takes too much longer, I will have another truck (trade them in before 60.000km). The GM truck is not as tough as the 2003 Dodge (here it goes). Park the Chev on a sidehill and you can not open the tail gate from frame and box flex. You have to take it easy over rough ground around the work site and while driving the back country in B.C. (watch the front end flex and deflect going across a trench). The superior frame of newer Dodges inspires confidence carrying heavy loads in rough terrain. The 555 Cummins motor gets better mileage (3+mpg better, 2.5l per 100km) and has more usable torque (try one you will see). The brakes on the Dodge were better also (my truck will not stop the truck in 4x4 low reverse (scary first time) servicemanager says thats normal. the Dodge would lock them up at slow speeds and it was a standard. But, the Chevy has the best interior by far, and the nicest ride on the road (not too rough aroad though) (partly due to flex in the frame and front end). and that is why I picked this GM truck (getting old I guess). Ialso think that the GM drivetrain from engine to the rear axle is on par or better tha the other 2. One other observation, how has GM gotten away with substandard tires, rims, and shocks for so long (had to replace all three at 5000km to get around the jobsite). I am also interested to know if any one has a tail gate where both cables are tight (or is tis another tough bananas from GM as I was told by the service department). I hope that my opinions and observations have not offended anyone. That was not my intention. In fact, I hope, that someone will respond with a cure for my engine managment problems (which everyone should have to some degree because I was told by GM that it is a software problem that they are working on) so I can finish the job that GM started. I sure do like the truck on the highway home. Thanx George K.

update for you..... I was forced into sueing GM for my money back ...... They told me the same thing, My truck spent 45 days in the dealer only to be told the way this piece of junk runs is normal...I too am going back to the mighty Cummins

I have a 2005 chevy duramax built on July 22nd 2004 and it surges and bucks around 1000 rpm when driving slow. I have about 3000 miles on it now and decided it was time to take it in for a checkup. Dealer had never heard of the problem and looked up on the gm tsb website and told me my truck had no tsbs on it and no reflash was available and it should be up to date. Check back later and if a reflash is available we will try it. Does anyone have a copy of the tsb or have a bulletin number I could show my dealer?

ttt

Geo i was talking to the gm service manger in duncan bc, and had one off customers trucks do surging thing over the Malahat. what the mech. did is detone the injecters pulse slightly said it runs good now? My smokes a bit, surges the odd time. cab let alot dust in, front light are starting to sweat in side, back seat material coming off, got back from a moose hunting trip (very dusty), check air filter and the dust bypass the filter "cool" so guys or gals check your filters Have a nice day Dave

Had injectors replaced, truck ran fine for 10 miles and then did it again. Took back to dealer, cleared code again for injector they had replaced the day before and now runs fine. It's been a few weeks and it hasen't done it yet, the odd thing now is that around the 180 degree mark the truck will surge quick once and then is fine. I'm sure mine is the only one that does this, just thought I'd pass it on.

Dave (fisher) Thanx for the info. Could you post the service managers name and work phone no. (after asking him) so I could give him a call to get the method info to pass it on to the locals. Since I bought this truck, I felt the surging problem was similar to my 2003 Dodge. Dodge cured it within 5 mons. of intro (which makes me wonder if GM is even trying) with the CO2 recall (it was masked as a possible safety issue). I under stand this stuff because I was in the biz, so I had to find out what they changed in the programming, because my truck just purred now. I took my truck and one that had not been reflashed and with the help of a former tech partner at the dealer (easy bribe of a couple of brown pop on a hot interior Sat. Canadian eh!) we downloaded the data and compared the data side by side. Dodge had decreased the pulse width (secondary) at light throttle and slightly decreased fuel pressure at midrange to WOT. It was a little less punch but very smooth. P.S. lived in Port Albernie for awhile, fished alot, know about the dust you speak of. Thanx Geo