2008 H2 rough idle
 

Anyone with an 08 noticed the idle being rough. Mine idles around 500rpm and the dealer says it should be 750. They said they have not had any complaints but I found a Hummer forum that had a thread about it. Now I can't find it again. I asked about a reflash but again it seems I know more about Hummers than they do, the answer was no reflash as of yet. Of course they asked me if I was using 93 octane and I have since new. Then the salesman who sold me mine says they fill all new ones with regular, it cost too much to buy premium. Duhuh...for $70,000 you would think they could buy 93 . Plus this is the first new car I have ever bought that the first oil change was not included; also, being the "corvette" engine it didn't even have synethic oil . Now mine has Mobil 1 in it.

Re: 2008 H2 rough idle
 

both of my 08's have rough idle... i just live with it...

Re: 2008 H2 rough idle
 

I have about 3000 miles and the roughness seems to be getting better. I use 87 and always have. I drove a demo for 1000 miles and it was the same as far as rough idle. :cool:

Re: 2008 H2 rough idle
 

Mine has the same rough idle. Seems like it has either gotten better OR I am just used to it. I burn regular fuel in mine since I got it. I have about 4000 miles on the beast so far.