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Old 07-26-2010, 03:32 PM   #41
Motorhead-47
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My 2009 MN6 LS3 has done it since new. I cured it by slightly richening up that portion of the calibration using HP Tuners. If you think it is bad bone stock, don't bother adding a cold air intake. I don't think E10 gasoline is helping either.
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Old 07-26-2010, 04:23 PM   #42
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i thought it was all the awesome low end torque haha
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Old 07-27-2010, 01:56 AM   #43
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Electronic Throttle sucks. My '01 WS6 would pull itself along at 6-700rpm and throttle was instantanious. I have always owned vehicles without ETC. I am not looking forward to it.
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Old 07-27-2010, 11:16 PM   #44
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I have a similar issue on an 08 Z06. When holding a constant speed in traffic, the engine wants to accelerate then immediately de-accelerate. Occasionally in a low gear the engine seems to miss, then pick up quickly. It's really quite annoying when driving it.

I will take it to the dealer this weekend.. hopefully they can see the problem and look into a fix for this.

Paul.
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Old 07-28-2010, 11:51 AM   #45
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Quote:
Originally Posted by Motorhead-47 View Post
My 2009 MN6 LS3 has done it since new. I cured it by slightly richening up that portion of the calibration using HP Tuners. If you think it is bad bone stock, don't bother adding a cold air intake. I don't think E10 gasoline is helping either.
I agree. Luckily, I'm able to get 94 octane without the ethanol, locally. On a trip though, I have to fill with the crappy 10% ethanol junk.
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Old 07-28-2010, 12:42 PM   #46
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4:10 gears helped with the low speed idling.
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Old 07-28-2010, 01:29 PM   #47
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A stock car should run as smooth as silk. I'd take it to the dealer.
my 1,000 rwhp car does not buck at all and it has a huge blower cam.
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Old 07-29-2010, 04:35 AM   #48
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After i read this, i checked our '09 M6. It does not have the exact same symtoms as your car. I can hold it above idle to 800rpm but that's all and not for long. I drove the car in 1st slow and it does not buck and jump as bad as you describe, only some. Good Luck and let us know.
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Old 07-29-2010, 06:45 PM   #49
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My experience in changing from an LS2 to an LS3 in an '06 A6 may be relevant to this discussion about M6 cars in that the LS3 still has a little more surging at idle than the LS2 even though the idle RPM is the same. I found that GM changed to a different torque converter part number in '08 (when the LS3 was introduced in the Corvette) and have always wondered if the reason for the change was due to the LS3's different idle characteristics. Of course there were other A6 tranny changes in '08 as well, but why the different torque converter? I guess only GM's R&D poeple know the answer to that.

I was considering swapping an '08 converter to find out if it's looser but that's a lot of work and expense for something that's only a hunch.

Last edited by vetracer; 07-29-2010 at 06:49 PM.
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Old 07-29-2010, 11:27 PM   #50
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The tune has a many tables that can affect how well it idles. Changing the minimum air table or coast down timing table can cure the problem. But these are things the dealer can't touch.
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Old 08-03-2010, 09:44 PM   #51
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Quote:
Originally Posted by Walt White Coupe View Post
Alright so yours is a little unstable also. What I don't understand is that my 05 never had any indication of this. It was smooth as silk at these speeds.

Can anyone with an LS2 engine (05, 06 and 07's) comment on whether or not they experience this instability?
After reading these posts and thinking about my own experiences with 06 MN6 I get the impression it is a matter of drivetrain equilibrium. Road conditions (incline), RPM, gearing, etc. are finding the point at which the backlash in the system can be sensed. I get a mild case of this in 2nd or 3rd while easing off the throttle on a slight downhill grade. Changing the load conditions with throttle or by shifting always stops the surging. Make any sense???
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Old 08-04-2010, 06:55 PM   #52
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It's definitely the worst in 2nd and 3rd gear and I can get it to surge almost every time with a slight increase or ease off of the throttle. This is a stock car. I shouldn't have to compensate for these issues and get creative with the throttle and shifting for it to drive right. Seems that there are enough people complaining that it's a legitimate issue/engineering flaw...
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Old 08-04-2010, 08:01 PM   #53
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When my 05 was new and stock it did that. It had a bad hesitation too. I tuned it as soon as software was available.
Same here...a tune fixed it...I had my ECM replaced and man did I forget how bad it was!!! Got my tune reloaded again and it was gone...
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Old 08-05-2010, 06:10 AM   #54
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No argument there! Was just offering up some comments that I thought might help.
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Old 08-05-2010, 06:18 AM   #55
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Quote:
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Any LS2's (05 to 07's) with this problem? I think it's confined to just the LS3 engine.
Yes - 06 (LS2). Gear train backlash! (IMHO)
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Old 08-05-2010, 07:50 AM   #56
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My 09 z51 does exactly the same thing
So does my '08 Z51. I'm not worried about it and glad I read this thread.
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Old 08-06-2010, 12:52 PM   #57
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My 08 A6 Vert does the same thing. Like everyone else, I thought it was just me... I mentioned it to my service guy, they couldn't find anything...so I just imagined I was driving a '69 L88...
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Old 08-06-2010, 03:03 PM   #58
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My 2010 is smooth as glass, but I did have the problem with my 1999.
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Old 08-06-2010, 03:59 PM   #59
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Quote:
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09C6Coupe,

If you are in neutral, can you hold any rpm between idle and 1100 rpm? Like say 850 rpm? Mine jumps from idle to 1100 rpm. Can not hold anything in between.

Same here 08 f55 mn6 coupe.....
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Old 08-06-2010, 03:59 PM
 
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