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What I've noticed is just the opposite, on another forum dedicated to the Nox/Terrain it seems only people with 2011 models are complaining about this. Something to do with the timing chain tensioners...mabe they changed specs or parts suppliers for 2011? I know that 2011 models had a recall for seatbelt latches that didn't affect 2010's.....different parts supplier.Here is a thread all about this issue.
http://www.chevyequinoxforum.com/showthread.php?t=314
Hope this helps. This is something that they are working on but I am not sure if they have found the definite fix. It's not something that generally affects the 2010 models that I know of but it is a issue with the 2011's...
Having same problem with out new 2011. Only 300 miles and it started the shudder and trying to stall. Dealer told us we would have to wait for Chevy to come up with a fix.
I'm having the same rattling noise on my 2011 4 cyl equinox. started a couple of weeks ago with only 500 miles on it. brought it in finally last week. they said it was the timing chain tensioner. they replaced it and said I was good to go. started it up the next morning and same rattling noise. It's happened 4 times over this past weekend. My car is at dealer again now. They don't know what it is and won't even acknowledge that GM is aware of the problem
They need to ask Z_ghost what they did to fix the rattle on his ride... Maybe that would help.