Lurching 40 to 50 mph slight hill

[Hmmm2]

I had a different issue going for 2.5 months. GM/Hummer Corp. strongly encouraged me to go to another dealership AFTER my service dept and Hummer tech (regional tech) checked mine out and said it was 'normal for H3's". I knew it wasn't normal. I also had to resort to GM Corporate Customer Service .. first, the cust. serv. person had to call the dealer to get their thoughts on the problem. When that person told me "it sounds like it's normal for H3's", I asked for the next person in line above her. It was the next customer service person above her who told me that another dealer might have a 'fresh pair of ears' and may have heard of my problem before. He was right. I finally bit the bullet and drove to another dealer who found and fixed the problem in ONE day. It has been 2 weeks and so far, so good. I drove up and down Mt. Charleston this past week in LV and didn't have any problems. I know you have one major Hummer dealer in LV .. are they the only ones available to you? Good luck! Keep us posted! (By the way .. my problem wasn't something normal).

[ChevyHighPerformance]

Originally Posted by Hmmm3

I had a different issue going for 2.5 months. GM/Hummer Corp. strongly encouraged me to go to another dealership AFTER my service dept and Hummer tech (regional tech) checked mine out and said it was 'normal for H3's". I knew it wasn't normal. I also had to resort to GM Corporate Customer Service .. first, the cust. serv. person had to call the dealer to get their thoughts on the problem. When that person told me "it sounds like it's normal for H3's", I asked for the next person in line above her. It was the next customer service person above her who told me that another dealer might have a 'fresh pair of ears' and may have heard of my problem before. He was right. I finally bit the bullet and drove to another dealer who found and fixed the problem in ONE day. It has been 2 weeks and so far, so good. I drove up and down Mt. Charleston this past week in LV and didn't have any problems. I know you have one major Hummer dealer in LV .. are they the only ones available to you? Good luck! Keep us posted! (By the way .. my problem wasn't something normal).

Could you please post what was replaced?

[Hmmm2]

Originally Posted by ChevyHighPerformance

Could you please post what was replaced?

Sorry, I thought you were all probably sick of seeing my problem posted here for 2 and a half months. My H3 had that grind in the rear right wheel area when I'd come to a stop. We live on a hill, so going downhill, heating up the rotors .. the grind would get very noticeable as you'd get to a red light or stop sign. Two and a half months ... all I heard was that it was 'normal for H3's". Yet, no one else I knew with H3's had that problem. After encouragement from members here and the GM/Hummer customer service manager ... I went to another dealer who was at a considerable distance from where we live. The second dealer turned the rotors, replaced front and rear brakes .. put new pads. The service manager told me I had a warped rotor. He found the problem in ONE day and took care of it. Soooo, it wasn't normal for H3's!!!!!!!!!

[Wisha Haddan H3]

The 1st dealership couldn't find a simple warped rotor?

Glad it's fixed now

[Hmmm2]

Originally Posted by Wisha Haddan H3

The 1st dealership couldn't find a simple warped rotor?

Glad it's fixed now

Go figure. Very discouraging.

[Boar-Ral]

I have a similar problem with my 2005 H2.* Around 40 mph, if I am trying to maintain my speed or very gradually accelerate, the engine surges, you can feel it, and you can see the RPM rise and fall slightly.* If I try accelerating a bit harder, the RPMs increase and the surging disappears.* I went to the dealership and they recommended fuel conditioner, a new air filter, and throttle body service, because it appeared dirty.* They threw fuel conditioner in, I put in a new air filter, but didn't have time to get the throttle body serviced, though I did buy cleaner so I will be trying that soon.* The problem still exists, so I hope that it is the throttle body.* If not, I'm out a couple hundred for their "diagnostic."* I just thought I'd mention it, since those are relatively easy fixes.* Not the same vehicle, of course, but the limited similarities might be enough that the same solution might work for both.

[Dave LV]

Unfortunately, not the same problem. Mine bucks like poor gas or cylinder misfire, but neither are occurring, and the engine rpm is rock solid. Got a call yesterday that an engineer thinks it is caused by the exhaust system... but I think the front differential carrier bushings sounds more like what is happening. Time will tell as the dealer will look at it more next week.

And again to all, the local Hummer dealer is trying everything and is being responsive - it is a GM design problem that appears endemic to all H3s, more in some than others.