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04-09-2009, 06:14 PM
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Hummer Veteran
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Join Date: Dec 2007
Location: Nashville TN
Posts: 148
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Re: Clunk heard when letting on/off gas?
I occasional hear the same. My service guy said it was from running low octane gas. Are you guys running Premium?
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2008 H2 Greystone, Corsa Sport Exhaust
Luxury package, Air Ride, Nav, DVD, Sunroof
Sedona Leather (nice!!) Dark window tint
Euro/smoke tint side, top and rear marking lights
K&N cold air kit, GM lockpic
www.TeamShooters.com
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04-09-2009, 07:08 PM
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Hummer Authority
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Join Date: Jun 2005
Location: Key Largo
Posts: 1,174
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Re: Clunk heard when letting on/off gas?
My 2008 does it when it's cold or when I get off the highway and slow down to a stop after a long highway drive. I think it's the 6 speed transmission and I really don't notice it that much anymore.
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04-09-2009, 09:06 PM
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Hummer Expert
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Join Date: Sep 2007
Location: Mason, OH
Posts: 779
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Re: Clunk heard when letting on/off gas?
most likley the x-fer case.
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04-10-2009, 01:51 AM
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Hummer Veteran
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Join Date: Jun 2007
Posts: 74
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Re: Clunk heard when letting on/off gas?
I am like you HummerJim, I think its the 6 speed as well. Comparing it to the old 4 speed with the 6.0 liter is a lot of difference. Due to me having both, it was hard for me to get use too. At first I didn't really like it because of all the shifting, but I will say as time goes on, I am liking the 6 speed more and more. The past 5 days, I have tacked on over 2,000 miles on my 2008 H2 and got 19 miles per gallon with it.
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To Stainless, I run Shell V-Power Premium in both of mine. Engine idles smoother, and dont downshift as much, plus you get better fuel economy.
2007 Hummer H2
2008 Hummer H2
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04-11-2009, 05:07 PM
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Hummer Guru
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Join Date: Jan 2005
Location: Oregon
Posts: 4,321
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Re: Clunk heard when letting on/off gas?
Quote:
Originally Posted by TGCOFTN
The past 5 days, I have tacked on over 2,000 miles on my 2008 H2 and got 19 miles per gallon with it.
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To Stainless, I run Shell V-Power Premium in both of mine. Engine idles smoother, and dont downshift as much, plus you get better fuel economy.
2007 Hummer H2
2008 Hummer H2
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19mpg? Really?
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If it has tires or testicles, you're going to have trouble with it
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04-11-2009, 05:26 PM
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Hummer Authority
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Join Date: Jun 2005
Location: Key Largo
Posts: 1,174
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Re: Clunk heard when letting on/off gas?
WOW! 19 mpg is GREAT! The best I've seen on the meter was coming east on highway 70 with a strong tailwind of about 30 mph at 15.1 mpg running premium in a flat area of Kansas running a steady 65 mph on the cruise control for a stretch of about 140 miles with just me in the Hummer. 13.5 mpg is my average on the highway, 11 mpg in town with my lead foot. My problem is the 6.2 is so much fun I tend to get on it a little heavy in stop and go traffic. I think other drivers are amamzed a Hummer can move out so fast!
Last edited by HummerJim : 04-11-2009 at 05:30 PM.
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04-12-2009, 03:30 AM
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Hummer Veteran
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Join Date: Jun 2007
Posts: 74
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Re: Clunk heard when letting on/off gas?
Quote:
Originally Posted by ROX
19mpg? Really?
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The truth is, I am actually kinda disappointed in it. I was really expecting BETTER.
I filled up in Hopkinsville, Kentucky and jumped on Pennyrlle Parkway and I did NOT use my cruise control ( I find the cruise control makes the engine downshift more than by driving with your foot. When going up a hill, I can gently ease off the gas pedal to where it will stay in overdrive and not downshift)
Anyways, I kept it at 55mph and those of you who has a 08 with the new 6 speed tranny will know at 55mph the engine is at a VERY relaxed rpm range.
Anyways.......I went to Evansville, Indiana. Then I returned back to the same gas station in Hokpinsville, Kentucky ( I went back down Pennyrlle Parkway again and kept it at 55mph with the pedal and not the cruise control)
Its good.........but not great, and I tell you the # 1 KEY REASON why it wont get better. Thats because the goverment has mandated all this stupid ethonal in gas (which makes it burn faster) so I dont care what kinda car you have, its gonna get less mpg due to the ethonal. The goverment added that in the fuel to help there own self, stop a think.......the more gallons we use, the more they make because they get taxes on every gallon of gas we purchase.
I can remember when the 2007 Escaldes came out with the 6.2 Liter. Gas did not have 10% ethanol in it, and I used The Escalde as a demo and by driving it like a egg was under the pedal, I got 24 miles per gallon with it.
Last edited by TGCOFTN : 04-12-2009 at 03:32 AM.
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04-12-2009, 01:35 PM
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Hummer Authority
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Join Date: Jun 2005
Location: Key Largo
Posts: 1,174
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Re: Clunk heard when letting on/off gas?
I have to agree that cruise control and the six speed go together like oil and water - not very well. Unless it is totally flat, like western Kansas I won't use the cruise control because the constant shifting on hilly terrain is annoying and it can't be good for the transmission over the long haul. I agree in the 50s would be the best mileage, but I'm much too impatient for that.
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04-14-2009, 06:02 PM
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Hummer Guru
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Join Date: Oct 2005
Location: Charlotte, NC
Posts: 2,767
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Re: Clunk heard when letting on/off gas?
Quote:
Originally Posted by TGCOFTN
and got 19 miles per gallon with it.
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God, I hope you're not complaining about 19 mpg. That's almost twice what I get.
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04-14-2009, 10:49 PM
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Hummer Veteran
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Join Date: Jun 2007
Posts: 74
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Re: Clunk heard when letting on/off gas?
Quote:
Originally Posted by OrangeCrush
God, I hope you're not complaining about 19 mpg. That's almost twice what I get.
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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.
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04-26-2009, 10:13 PM
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Hummer Veteran
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Join Date: Jan 2009
Location: Maine
Posts: 103
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Re: Clunk heard when letting on/off gas?
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....
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2007 Hummer H2
2010 Jeep Rubicon
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