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#21
10-27-2007, 02:08 AM
Hummer Authority
Join Date: May 2005
Location: Texas
Posts: 1,304
Re: This Just In... All 2008's must run PREMIUM!
Quote:
Originally Posted by mikejr
No i've had no knocks, but the engine does idle a bit rough. But I just figured it was how the engine was supposed to idle. Almost like it has a hypo cam in it or something.
I don't think higher octane would smooth the idle, but I agree that 2008 models idle a little rougher. The exhaust, to me, sounds a lot better too (more aggressive), and that's just one of the 'downsides' to having the bigger, nearly 400 HP engine in the '08 
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