Shuddering ruff vibration between 40-50mph at 1500 rpm and under. What is it?

[GreyGhost]

No engine light, but when my truck is in between 40-50 at low rpm's "1500" or less it shudders and the rpm gauge jumps up just a lil and back but when I get it to 60 or faster it stops. Any suggestions?? I just put a new upstream O2 sensor in bank 1 and the engine light went off, but still have the above problem.

 

[alrock]

Have you checked for any codes? Some can come up even without a CEL

 

[Big2dabank]

Did you check the knock sensors. They are notorious for going bad on the H2 because they get covered in dirt and water builds up around them and causes them to corrode and inevitably fail. Might be your problem, sounds like similar symtoms I had when I had to change mine.. Check out this thread by Chastan, its a good overall summary of what happens and how to fix...

http://www.hummer4x4offroad.com/for...ead-(from-my-archives)&highlight=knock+sensor

 

[GreyGhost]

Didn't check for codes since I thought the original prob was 02 sensor, fixed that no light anymore. But will check for codes today. I pray it's not those knock sensors! I havnt owned this truck 2 months yet and I'm ready to just trade it off. Some others have suggested maybe the torque converter? I'll do more research on the knock sensors tho. Thx guys

 

[LagunaH1]

Is the shuddering related to how much load you put on the truck? does it happen when you coast and / or when you get on the gas?

 

[Big2dabank]

I'm sure its not the truck, not sure of your mileage, but your most likely just happening to catch repairs in the middle of typical maintenance items.

 

[GreyGhost]

It only shudders when I apply light throttle immediately and only in overdrive until it gets up over 1500 rpms then goes away the faster I go. I can hammer on it and it goes like bat outtA hell no problem.


108,xxx miles so yeah I'm catching all the maintanace bugs and who knows what else. It's a very clean local truck too btw.

 

[ABNTROOP]

Could it be tires needing to be rebalanced?

 

[GreyGhost]

It's an engine stumble stutter. I can watch the tach and hear the engine get ruff then it sounds like it's trying to adjust like it's missing. Still has original plugs n wires too. I'm needing to order a new set.

 

[Big2dabank]

Once you get past some of this catch up maintenance, you should be happy with the truck. I'm just shy of 170,000 miles and still rolling strong.

I don't guess you had any kind of warranty with the place you purchased the truck, ie 30, 60 or 90 days...

 

[Scarsman]

Sounds like maybe the trans is searching? Try getting it right in that zone and once it's doing it move the shifter from " D " to "3" and see if it stops and the tach stays "up". I bet it's going to be something to do with the shifting.

Sent from my C811 4G using Tapatalk now Free

 

[GreyGhost]

I too think the trans is searching. I just talked to a mechanic and he said he believes it's the torque converter selenoid not actuating properly. He sold me some crap called dr. Tranny that ya just poor down the dip stick tube. He swears it'll work instantly? I'm skeptical but ill report back soon as I drive it. I'm getting the tranny flushed next week too. He quoted me $175. Is that about right? Thx for the help too guys.

 

[GreyGhost]

Big2dabank I talked to the salesman about it and he said technically he didn't have to do ****"in his words" but I could buy a warrenty for $300 if the tranny is fried and he would put the original vehicle purchase date on the warranty. Then he said I could take it anywhere to have the tranny fixed. "Worst case cenario anyway"

 

[Big2dabank]

Big2dabank I talked to the salesman about it and he said technically he didn't have to do ****"in his words"

wow thats what you call service after the sale, typical bullish!t. Hopefully you find the culprit soon. Last tranny flush I had was $145 (11 quarts of Dex3).

 

[twinmill28]

Throttle postion sensor. Just replaced one in my van and life is good. Damn thing would get a weird idle all over the place, RPM would go all over the place, died a few times but start right up, occasionally jerk when stopping like somebody hit you from behind---mind you it didn't do all of this at once, or even all the time, it was just all over the spectrum and annoying as hell. Ran great on it's last road trip on the interstate, just ran like poop occasionally when started, and did all the above stuff randomly once put into gear at low speed.
New sensor was $30 and took about 20 minutes to replace on the van, but the damn thing was on the firewall side of the throttle body (inverted engine) and screws were a little hard to get at.

Maybe this isn't your problem, but it sure came to mind as soon as I read your symptoms--and it also had no check engine light.

BTW--don't give up and trade it yet. There will some reconditioning needed to get it dialed in, especially over 100K miles.
Plugs and wires are a great simple and much needed start. Replacing sensors is also good while you're troubleshooting--this stuff also helps for peace of mind.
The big thing is that you are learning more about your truck than you may realize, and becoming familiar with it's operation so that down the road when it gets to acting strange for some reason, dialing in the problem will be much simpler and less discouraging.
If you've ever followed Tim G on any of his used HUMMER buys, he is very thorough and has a list of stuff he reconditions on them as soon as he gets them home from the dealer. He's very detail oriented and shakes his trucks down front to back. You might PM him for great info on where best to put your money on parts.
The more you work on it and ask questions around the forums, the more comfortable you'll become with it. Heck, you might even make some new friends!

 

[GreyGhost]

Throttle position sensor is now on my list. I just replaced one on my 06 mustang gt with same simptons. One of these days lots of dollars later done. Lol I'm just gonna keep it and press on. Too cool of a rig to let go I get frustrated at mechanical B.S.!!!

 

[GreyGhost]

Sounds like maybe the trans is searching? Try getting it right in that zone and once it's doing it move the shifter from " D " to "3" and see if it stops and the tach stays "up". I bet it's going to be something to do with the shifting.

Sent from my C811 4G using Tapatalk now Free

i just tried this and yes it does the same thing in 3rd gear. Does that mean torque converter or torque converter selinoid? Or is the whole tranny just taking a dump on me?

 

[LagunaH1]

Make sure to tell your mechanic about what you learned, bet that'll help him narrow down what the issue is.

I obviously don't know for sure what the problem is, but based on my experience with my own truck, there is a pretty decent chance that the issue could be something as simple as a sensor or a solenoid. Good luck and please keep us posted

 

[Fish]

I would make sure your throttle body and mass air flow sensor are clean before moving to anything else.

 

[GreyGhost]

My wife and I installed new plugs n wires today. It runs better and decreased the shudder. Fuel filter is next. I'm not wasting money becuz I'm keeping this truck. Gotta programmer on the way now. First gm vehicle I've ever owned. I miss my powerstroke but determined to make this hummer wicked.

 

[GreyGhost]

Srry fellas will post my super duty wen I find the pic. These other two I built myself but don't come close to my 08 stroke with spartan tuner drag racing and spinning over 40" toyo mts in 4x4 at 40lbs of boost.

 

[hmmrdave]

It's the Torque Converter. My H2 did this early on. I work at a GM dealership and found a bulleting relating to the exact condition. GM part#17803805. It fixed mine

 

[GreyGhost]

It's the Torque Converter. My H2 did this early on. I work at a GM dealership and found a bulleting relating to the exact condition. GM part#17803805. It fixed mine

Im in convinced it is too. Thx for the part #. How much should that cost to be fixed? Also is there an aftermarket torque con that's stronger?

 

[Zach]

That bulletin is for a whine or whistle or chirp at 1500-1800 RPM's and not for a shudder. I'm not saying it isn't the converter. But the bulletin addresses a different complaint

 

[GreyGhost]

Definately no whine or whistle…