2012 AWD Denali Xl questions?

[brbohica]

Just came up on 2600 miles on the denali and been noticing some weird things lately and like to see if any of you have had same issues.

1st issue: when sitting in park or at a stoplight, noticing a flutter in the engine and the rpm's bumping up and down slightly. Wondering if its a fouled plug or something. Been using 93 octane gas from shell.

2nd issue: when in gear and pulling out slowly either straight or in a turn feeling this odd jerking feeling. Is that the awd system? After 1st gear I dont feel it anymore. First time for an awd vehicle.

3rd issue: noticed that after installing the corsa exhaust that it hardly stays in v4 mode, even cruising at 60mph, I'll hear it for a few seconds then its back to v8 mode.

By the way my last post about the corsa exhaust, apologize about that. After some time the exhaust is broke in and sounds great.

And this forum has been a great help in adding accessories, ups is constantly showing up with new stuff.

Bryan

 

[doubletapdrew]

Not sure about the flutter. You should take it to a dealer (should be covered under warranty) to find out. I'd highly doubt a fouled plug at 2600mi, they are usually good to 100k or so.
The jerking on a tight turn is normal for the AWD system. The first time I had one it almost felt like it was "binding" a little, but it's normal. Try a 4WD and you'll notice it even more on sharp low-speed turns.
Not sure about the exhaust. Maybe since it's flowing more it thinks you are asking for more power. The service dept should be able to plug the tech2 into your ECU and adjust the point where it goes from v4 to v8. Or if you are going to tune it I'm sure black bear can adjust the points too.

 

[Parthery]

My 2010 with 51K has fluttered since day one.....I've had the throttle body cleaned as that was supposed to fix it, but it hasn't helped. I've been running premium fuel the last couple of tanks to see if there is any improvement but I haven't seen any so I will likely switch back to 87.