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Old 08-07-2011, 08:20 AM   #76
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Quote:
Originally Posted by Shu71 View Post
Is the torque converter locking up too? Can you duplicate at other speeds since it is shifting early in auto mode? Can you replicate by matching rpms in other gears? Like I said earlier the manual cars do this too but at 2000 to 2200 rpms in third gear at about 30 to 35 mph. So while I hear what you are saying, I wonder if by you holding the shift to later isn't just a Bandaid and not the real fix for the real cause.
sometimes at lower speeds it is hestent to shift to a lower gear but mostly its the 5th and 6th gear that is the majior issue i am also worried about the long term effects of this cause runing an transmission like this at such low RPM cant be good IMO
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Old 08-07-2011, 08:21 AM   #77
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Good info, bad grammer
yeah sorry :( my grammer sucks
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Old 08-07-2011, 08:45 AM   #78
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What octane are you guys using that are experiencing this? I have a manual and can cruise at 40MPH without a problem in 6th gear(I know the ratio's are different for the manual though). I use 93 octane and found that it did help with engine lugging when trying to accelerate from a low RPM(It would lug with 87, but not with 89 or higher).
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Old 08-07-2011, 08:48 AM   #79
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What octane are you guys using that are experiencing this? I have a manual and can cruise at 40MPH without a problem in 6th gear(I know the ratio's are different for the manual though). I use 93 octane and found that it did help with engine lugging when trying to accelerate from a low RPM(It would lug with 87, but not with 89 or higher).
i run 98 mid grade also i got the 6 power plant

*edit* i know what your geting at but i ALWAYS use it so "bad gas" or "wrong gas" is out the window in this one lol
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Old 08-07-2011, 09:59 AM   #80
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Sterling, Since you have the manual transmission, try running at 30 to 35 mph in third gear when rpms are around 2000 and then hold steady speed. You should or may feel the engine almost feel like it is missing. If you are sitting still in neutral and barely bring it off idle and you may feel the same missing feeling in the engine. Let us know. I too can put the car into a lug situation 6th gear too early and it will pull clean, it's just one area that doesn't feel smooth that I can replicate in the two scenario's about. All you automatic guys, try to do the same thing off idle in park. If you can make it run rough sitting still, it isn't drive train it's engine tune.
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Old 08-07-2011, 10:07 AM   #81
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Siper, cat back or headers and full exhaust? Cat back will change the timing of the exhaust waves and can make the poor exhaust manifold design even poorer since they do nothing to prevent reversion. I would like to figure out if this is a reversion issue or a engine tuning issue. You should be able to run an automatic in 6th gear and 1300 rpms with no vibration from the engine. All newer lockup converter auto's will jump to high gear and lock up the converter when there is little to no throttle input and will not cause it to do this. I don't think it is a transmission function issue, but rather a tune or reversion issue since the manual cars are doing it too although in a different situation.
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Old 08-07-2011, 10:12 AM   #82
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My v6 2011 has the same issue. I was going to make an appointment to take it in for service. From reading all the posts, looks like theres no need.
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Old 08-07-2011, 10:43 AM   #83
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Hmmm...I know other people have mentioned a "dead spot" in a certain rpm range. The new Vmax throttle body is supposed to take care of that. Not sure if it would help with the vibration issue.

I can't really say that I've noticed any weird vibrations at 45 mph. My rear view mirror will shake a little during a cold start, but after that it's smooth. I also usually run 93 gas, so not sure if that helps, too.
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Old 08-07-2011, 11:12 AM   #84
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man type your posts in MS Word and press F7...then copy/paste onto here. Please, do us all a favor...
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Old 08-07-2011, 11:20 AM   #85
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My v6 2011 has the same issue. I was going to make an appointment to take it in for service. From reading all the posts, looks like theres no need.
Take it in, get it documented. Everyone, please take yours in so we can get GM's attention.
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Old 08-07-2011, 11:50 AM   #86
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Yes, I will agree with all. The trans., when in "D" shifts to 6th gear asap to save fuel. So the vibration is due to the engine lugging for a few seconds when you push the gas pedal, before the trans. downshifts to 5th or 4th. Many posts in the past 6 months have come up with this conclusion. Jeff Morris with Chev. Cust. Serv. has had some replies on this with no solution. Lets see what the owners of the 2012's say in a few months. Maybe GM will fix this for the new models.
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Old 08-07-2011, 11:57 AM   #87
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Quote:
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yeah sorry :( my grammer sucks

Spell-check my friend. I use Firefox and it will underline misspelled words in red. You can then right click that word and it will provide suggestions of correctly spelled words for you.

I'm not trying to rag on you, and I know this is a forum and not English class, but I think that would help you a bit.
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Old 08-07-2011, 12:19 PM   #88
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Good info, bad grammer
Since this thread seems to be covering the transmission issues as well as the advantages of using spell check you misspelled the word "grammar"...
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Old 08-07-2011, 06:29 PM   #89
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I've had my 2LS for a little over a week now and it has done it from day one. I did come across some threads on the Malibu forum for the same issue, with the 6spd autos (TCC shudder). Seems GM issued a firmware flash to resolve but it didn't appear to be completely effective and in some cases made it worse. All we can do is get the issue documented and ran up the ladder to the General for more urgency and wait for the fix to be released.
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Old 08-07-2011, 07:34 PM   #90
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I must be lucky..I don't have vibration issues at low RPMs or at lower speeds. I have used mid grade gas since delivery, maybe related? Who knows, just glad I am not experiencing that..whew!
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Old 08-08-2011, 10:26 AM   #91
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Have taken in mine every 6 months since picking it up on 06/25/09 (2LT Auto) same issue.
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Old 08-08-2011, 04:51 PM   #92
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Thanks for the investigation Nightfall. I'll have to look and see what I can dig up on this. I'll get back to you with my findings soon.

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Old 08-08-2011, 05:11 PM   #93
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What's that boy?!?!?! Timmy's down a well - bring a rope?


Thanks for checking on this...I figured it all along as a harmonic issue with the engine lugging in too low of a gear.
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Old 08-08-2011, 09:06 PM   #94
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Honestly I do not think GM will do anything regarding this issue. They got our money and that is all that matters to them!!!!!!!!!!!
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Old 08-09-2011, 11:24 AM   #95
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Originally Posted by ncjillian View Post
I just bought my 2011 V6 LT1 08/02/11
and it feels like the engine is stuttering around 35-45 mph I am taking it to service in the morning. Does anybody know what this is??? I just traded my 2005 Mustang and I know the transmissions are very different but I am having a hard time figureing out why this car is so shaky and not smooth, pulling off is the worse. I've driven a stick 10 years so I know how and when to shift. They better not give me any BS at Chevy service tommorrow. They tend to tell women BS.
Hi ncjillian. Do you have anything to report back? What did your dealer tell you when you went in? I hope they didn't treat you the way you described. Thank you for your time.

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Old 08-09-2011, 11:31 AM   #96
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So Jeff, what are you hearing at GM as the reason for this in both automatic and manual transmission v6's?
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Old 08-09-2011, 11:39 AM   #97
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Try this thread on same subject:
http://www.camaro5.com/forums/showthread.php?t=138991
Economy... you are in a high gear low revs... economy = vibration.
You are in 6th... Tap down you will see it go to 5th.
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Old 08-09-2011, 11:44 AM   #98
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Automatic " it seems that the tranny shifts into 6th " it is what gear the programing puts it in. ( I would not think 6th at 45)


Hmmm just thought of a test:
  • drive at 45 - 50 MPH note vibration.
  • Tap down see what gear it puts you in
  • if it goes to 5, you were in 6th
  • if it goes to 4, you were in 5th
  • that should at least tell you what gear you were in when you felt the vibration??
Confirmed some time ago... forgot to post it!! I am in 6th gear at those speeds.
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Old 08-09-2011, 12:01 PM   #99
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Again the manual transmission cars do this just like the automatic cars. I don't think it is a transmission issue but rather a tune issue or poorly designed exhaust issue which is allowing reversion to occur. If the later is the case, it may explain why GM redesigned the 2012 v6 heads to incorporate the exhaust manifolds. If it is a specific load, rpm, timing curve, afr curve, map position stumble, then GM needs to recall and preprogram the cars tune. This is why I asked if anyone with a Trifecta tune had the issue or if anyone with long tube headers has the issue. If either of those tuned it out, it's a TUNE issue not a transmission one.
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Old 08-09-2011, 12:41 PM   #100
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Originally Posted by Shu71 View Post
Again the manual transmission cars do this just like the automatic cars. I don't think it is a transmission issue but rather a tune issue or poorly designed exhaust issue which is allowing reversion to occur. If the later is the case, it may explain why GM redesigned the 2012 v6 heads to incorporate the exhaust manifolds. If it is a specific load, rpm, timing curve, afr curve, map position stumble, then GM needs to recall and preprogram the cars tune. This is why I asked if anyone with a Trifecta tune had the issue or if anyone with long tube headers has the issue. If either of those tuned it out, it's a TUNE issue not a transmission one.
OK thanks for the clarification. I now understand what you are saying after reading further up the thread. Thanks.
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