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Old 10-03-2011, 10:56 AM   #137
Dennyd
 
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Just figured I would update my 1200 rpm problem. I now have 8000 mles on the car and the problem has gradually grown worse. It now excites something in the door panel and now I have door panel vibrations. When new the car did not have this problem. It first occured at about 3000 miles and has progressivly grown worse.
This weekend while driving my wife's Monte SS with a 3800 V6 auto I noticed that the engine rpm never drops below 1500 rpm. For our cars it seems to me, a simple interim fix would be to revise the software to change the tranmission shift points to not let the engine rpms drop below 1500. Apparantly this engine doesn't like to operate smoothly at 1200 rpm.
All I know for sure is that it is becoming so annoying that I am now considering seLling the car, but anyone test driving the car will notice the 1200 rpm buz and ask what it is? and all I can respond is UNKNOWN.
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Old 10-03-2011, 11:02 AM   #138
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I asked this a while back, maybe page one or two of this thread, but does anyone with headers and or a tune still have this issue? I have the M6 transmission and I do not get the 1200 rpm vibration, but mine comes in at 2200 rpms and steady speeds light throttle position. I can shift around it.
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Old 10-04-2011, 12:15 PM   #139
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Quote:
Originally Posted by rydahog View Post
why would you be in 6th at 45 mph or so...car is lugging in and weird things appear worse..get in 3rd gear..
Because thats when the computer shifts it into 6th gear. We have no control over that unless you constantly switch the car into sports mode.
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Old 10-08-2011, 10:31 AM   #140
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Don't worry about it, Jeff is working on it as we speak.
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Old 10-12-2011, 02:19 PM   #141
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Just a quick update. I haven't seen any new information come through at this time but I am working to get something updated or some kind of work done to see if we can't get something together to try and rectify this for you.

Jeff Morris, Chevrolet Customer Service
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Old 10-12-2011, 03:06 PM   #142
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Interesting.

It's kind of interesting that I'm also getting a 1400RPM buzz coming from the exhaust, in a SS M6.
Only happens at that RPM with clutch engaged and pushing on the throttle.

Could all of these issues be the same thing?
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Old 10-12-2011, 06:22 PM   #143
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I'm being told this problem is exhaust reversion. The service mech who took care of my car drove it and also drove another 2LT off the lot and both did the same thing. I also had another mech (used to be a GM service mech) drive it and he said the same thing, exhaust reversion.

With that being said, I was told the only fix for this is the use of counter weights on the exhaust and GM needs to find where to put the weights before they can send out a alert. Now is GM ( Jeff ) even looking at this as a fix?
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Old 10-25-2011, 11:20 AM   #144
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Jeff, are there any updates about this vibration problem?
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Old 10-26-2011, 11:52 AM   #145
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I'm still looking into this and haven't found anything yet. I'll update you all when I get something.

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Old 11-06-2011, 10:34 AM   #146
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The last post regarding the "6th gear/auto rumble" was April 2011. Has anyone actually figured out what the vibration is caused from. Always feels like it should be a gear lower. Please post if there is any updates . Thanks
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Old 11-14-2011, 12:35 AM   #147
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I'm waiting to hear too.
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Old 11-14-2011, 08:16 PM   #148
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9000 miles , mine still doing it also. 1200 rpm, 6th gear to high. I guess we live with it.
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Old 11-16-2011, 02:22 PM   #149
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Quote:
Originally Posted by Sooner Guy View Post
After filing a complaint with gm, the custumer service specialist talked to the manager of the dealership about the vibration in my camaro. I took my camaro in to the dealership for the second time, and the tech guy showed me a document relating to this very problem. The deal is if you bought your camaro before a certain vin number then mostly likely you're going to have this vibration problem. The good news is that as of october 27th gm/chevy has been working on resolving this issue and said that they would call me and everyone else as soon as they have the software to correct the problem. Hope this helps.
That sounds great!!
If you can find out the tech bulletin number (or what ever Chevy calls it) from your Dealer Tech Guy!!
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Old 11-16-2011, 04:22 PM   #150
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Originally Posted by Silverlsinva View Post
There is this small annoyance i have and i hope its not a normal thing that everyone is experiencing. when im driving along about 45 to 50 mph it seems that the tranny shifts into 6th and it settles to a lil bit above the 1000rpm mark and when i lightly press the gas to maintain 45 mph or even 40 mph i get a pretty decent amount of vibration i dunno if the engine is lugging or somthing binding but if i am goin about 50 mph it doesnt do it cause im guessing higher rpm. It just seems the autos are a bit over agressive to find a lower gear for gas mileage purpose i dont wanna have to use manual mode just so i cant keep it at a certain speed. Any help and comments are welcome.
I purchased a 2011 Camaro in June 2011 and within the first 200 miles experienced the same problem. My vibration was so bad it would shake the rearview mirror. After taking it in twice the last time they kept the car and replaced it with a like car. The second car which is identical to the first one...DOING THE SAME THING....took it in this week and they state it is a problem but don't know how to fix it yet. GO FIGURE. They stated it had something to do with the time of the run when the car was made. Not all of them do it. I have a V6 Auto with heads up display.
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Old 11-29-2011, 11:18 AM   #151
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Hey Silver, I have heard/felt this same thing since I bought my auto v6 RS back in June. Thought it was just my car till I read your post.

I notice that around 35-55 mph (mostly 45 mph) and w very light gas, usually just enough to maintain the speed, it does that grinding/humming sound w a light vibration. This goes away if I decrease speed, or accelerate.

I'm going to keep reading the replies to see if this is nothing to worry about, or a defect in the auto v6 transmission... but just thought I'd let you know I'm having the same issue.

Kevin
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Old 11-29-2011, 11:27 AM   #152
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Quote:
Originally Posted by moondance View Post
I purchased a 2011 Camaro in June 2011 and within the first 200 miles experienced the same problem. My vibration was so bad it would shake the rearview mirror. After taking it in twice the last time they kept the car and replaced it with a like car. The second car which is identical to the first one...DOING THE SAME THING....took it in this week and they state it is a problem but don't know how to fix it yet. GO FIGURE. They stated it had something to do with the time of the run when the car was made. Not all of them do it. I have a V6 Auto with heads up display.

Woah... seriously Moon? They replaced your whole car for this issue? I have a 2011 v6 w RS trim including HUD.

Mine has done that humming/vibrating/grinding @ 45 mph thing you all are speaking of as well since I bought her new back in June... & I currently have 8k miles on her. So is this a serious issue or something?

Kevin
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Old 11-30-2011, 04:12 PM   #153
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Kevin, there is a document in my resources that may pertain to this issue. The only one who can make that distinction would be your dealer. I would suggest getting it checked out and make sure that they check through their resources to look for this document. If you have any troubles let me know.

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