Clunk heard when letting on/off gas?

[OrangeCrush]

Originally Posted by TGCOFTN

and got 19 miles per gallon with it.

God, I hope you're not complaining about 19 mpg. That's almost twice what I get.

[TGCOFTN]

Originally Posted by OrangeCrush

God, I hope you're not complaining about 19 mpg. That's almost twice what I get.

Oh no........not complaining at all. I was just expecting a little better due to driving it like a egg was under the gas pedal.

I have drove it hard, and gotten as low as 11.8 MPG

It really just dont pay to drive the Hummers fast, unless you enjoy just throwing money down the drain for gas. For me, when I go on trips, I normally keep it at 60mph and listen to the XM Radio, or bring some good CD's and just enjoy the drive.

[solarflare]

good gas mileage.....pretty impressive.....well back to my original post....my noise has now gone into a rough bang into 1st gear when coming to a stop.....doesn't do it all the time, but has been getting progressively worse. When it does do it, it seems as though the torque convertor is sticking, and then banging into first.
Any thoughts???? I don't have a hummer dealer close by, and the chevy dealer around here, says just go out and ride it hard.......not to great of a place....

[dbartromsut]

Yep, my 08 does the same thing! It doesn't really sound like it is coming from the engine, so I don't see how running low octane fuel would make it do that. To me it sounds like its coming from the rear end... But mine does it and I do run 87 octane, so maybe. I'll try premium for a while and see what happens! You guys get way better mileage than me! I am lucky to get 10.5 mpg on the highway, but I would imagine that my tires, wheels and lead foot have to do with that!

[TGCOFTN]

Originally Posted by dbartromsut

Yep, my 08 does the same thing! It doesn't really sound like it is coming from the engine, so I don't see how running low octane fuel would make it do that. To me it sounds like its coming from the rear end... But mine does it and I do run 87 octane, so maybe. I'll try premium for a while and see what happens! You guys get way better mileage than me! I am lucky to get 10.5 mpg on the highway, but I would imagine that my tires, wheels and lead foot have to do with that!

Wow........10.5 mpg.....I dont recall getting that low in my 08 or my 07 H2.
You should try switching to premium and see if you see a increase in miles per gallon. I have been on a trip in my 2008 and ran it 75--80mph and got 13.8mpg. The only thing I can think of is maybe its your tires where mine are factory and yours are oversized.........and then of course running on regular unleaded. For me, I can go more miles on a tank of premium than I can on a tank of regular. With the regular you may save a buck or two at the pump, but on mine, when hitting a hill, it downshifts and acts as if its starving for power. So the buck or two your saving at the pump, your just blowing it out your tailpipe.

Try running a few tanks of premium in it, and see if it improves.

[TGCOFTN]

Originally Posted by solarflare

good gas mileage.....pretty impressive.....well back to my original post....my noise has now gone into a rough bang into 1st gear when coming to a stop.....doesn't do it all the time, but has been getting progressively worse. When it does do it, it seems as though the torque convertor is sticking, and then banging into first.
Any thoughts???? I don't have a hummer dealer close by, and the chevy dealer around here, says just go out and ride it hard.......not to great of a place....

My 08 does the same exact thing ( I know I have posted this before ) but I just wanted to add a little extra words this time. For me, I have noticed mine tends to do it while slowing down/coming to a stop on a down hill grade. I live on a Hill, and as I am coming down the hill slowing down to pull in my garage, it tends to make that clunk noise going into 1st gear. I am not sure what it is, not sure if its in the Transfer Case, Transmission, or Rear End.
As long as mine is not doing it all the time, I am not going to worry with it due to other 08 Hummers are doing the same thing.

I agree with you, I dont think thats a great dealer just saying to go and ride it hard. Not very professional if you ask me.