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Old 08-06-2011, 08:48 AM   #51
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Old 08-06-2011, 09:04 AM   #52
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Old 08-06-2011, 09:20 AM   #53
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Old 08-06-2011, 09:27 AM   #54
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Old 08-06-2011, 09:36 AM   #55
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Basically what he is saying is that the PCM is making the transmission shift to 6th gear at lower rpms than it should. However, I don't think it is this simple. The manual transmission cars have the same problem. I can make mine do it at 2000 to 2200 rpms steady speed 30 to 35 mph in third gear. If I UP shift at that speed to 4th it drops rpms to 1700 or so and the vibtration goes away. I firmly believe this is a throttle position, MAP, timing and VVT tune issue. When you shift, either up or down, you force the engine to a different point on the tune table and thus it stops vibrating like my old Harley. Since both manuals and autos are having this problem, it isn't a torque converter shake issue either. The only other thing which could be causing it is exhaust reversion which would cause the AFR to jump all over the place when exhaust gases are reverting back up through exhaust valves, then intake valves and thus messing up in incoming intake charge. This is why I asked in antoher thread on this if anyone with long tube header (would change reversion timing or eliminate it) or anyone with a Trifecta tune is having the issue.
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Old 08-06-2011, 09:49 AM   #56
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My Camaro V6 Automatic also vibrates while driving at 37 - 47 mph at 1100 rpms. The automatic is set to shift to 6th gear once you hit a certain speed. For me I think its around 37 MPH. If I lift my foot or if I accelerate the vibration goes away temporarly. Now if you put the car in "M" (Manual Mode) then depress one of the shifter buttons on the steering wheel to have the car enter paddle shift. You can avoid the vibration all togather because who in the correct mind would be in 6th gear while driving at 37 mph. I really think Chevrolet should do something about that shift point. Perhaps keep it in 5th gear until say 50 mph or X rpm.
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Old 08-06-2011, 11:38 AM   #57
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Old 08-06-2011, 01:53 PM   #58
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My Camaro V6 Automatic also vibrates while driving at 37 - 47 mph at 1100 rpms. The automatic is set to shift to 6th gear once you hit a certain speed. For me I think its around 37 MPH. If I lift my foot or if I accelerate the vibration goes away temporarly. Now if you put the car in "M" (Manual Mode) then depress one of the shifter buttons on the steering wheel to have the car enter paddle shift. You can avoid the vibration all togather because who in the correct mind would be in 6th gear while driving at 37 mph. I really think Chevrolet should do something about that shift point. Perhaps keep it in 5th gear until say 50 mph or X rpm.
thank you +1 that is what i am saying
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Old 08-06-2011, 01:58 PM   #59
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Old 08-06-2011, 02:01 PM   #60
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You would think with near 1500 posts in 60 days, it would be easier to understand. LOL
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Old 08-06-2011, 02:02 PM   #61
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You would think with near 1500 posts in 60 days, it would be easier to understand. LOL
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Old 08-06-2011, 04:42 PM   #62
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how did you guys not understand? lol and that does make sense. I put the car in 6th at about 50mph, 45 way to low and the bogging down does make sense.
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Old 08-06-2011, 04:50 PM   #63
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Personally, I've never noticed any vibration.
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Old 08-06-2011, 05:43 PM   #64
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Everyone else who has been complaining about the V6 A6 vibration at 45 mph, well I think I have found the problem.

Last night while I was driving to work, I had it in D because I wanted to cruise to work when I noticed the vibration again from 43 to 45 MPH... so i did an experiment.

I shifted from D to M because i had a sneaky suspicion... since I drive so much in M, I hit the down shift button and BOOM I was driving in 6th gear doing 45 MPH.... weird.

Now when i drive in M, i normally dont even touch 6th gear until i am at least doing 50-55 MPH. On average, I cruise 45 to 55 MPH in 5th gear or so.

------- I edited to here and gave up...taking too much time. (except for the spelling mistakes that were underlined v v v)

i was right in D mode when the computer controls the shifting it shifts WAY to early into 6th and it causes heavy vibration so much so your rear view mirror rattles like a bass hit

my only guess for this problem is one of two things A it is programed to save you as much fuel as possible IE get to 6th as fast as possible i notice when your just cruising it shifts about 1,800 or below rpm as me in M i shift perfectly at 2,000 on ave or close to it

or B the computer coding is screwed up and it feels it needs to shift into 6th so damn early either way the computer should be recoded to shift at a higher speed then 45 it knocks it too low on the RPM and bogs to the point the car vibrates

my only way around this and the main reason i started to drive in M was to avoid this i knew something was wrong i never guessed it was the computer shifting time programing ugh

anyhoo anyone else try this i got all shift points down from 1est to 6th IE 10mph shift to 2ed and so forth everyone else try this tell me what you think

and Jeff hi if your reading this can you call your tech people asking them about changing the coding for the shift points? with out voiding anything to improve a more stable non vibrating ride? is it possible?

thank you for your time Nightfall (i learn ever car i own to the T and all its flaws)
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Old 08-06-2011, 06:33 PM   #65
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I CANT SPELL I CANT TYPE ALL I CAN DO IS BE A POST WHORE and i am damn good at it
Good job investigating and playing around with the car, seriously. I had read what some V6 owners were saying about the A6 and the low speed issues. I thought it sounded like what my car will do cruising into our neighborhood. I do 30mph or less, that's right between 1st and 2nd and it will "shudder" like what's been described.

As for your grammar. The title of this thread, "...problum", is why I checked it out. I did mention this to you in another thread but nobody else said a word. I didn't want to get dinged for mentioning it a second time. I will reiterate, you are a very open and honest person.
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Old 08-06-2011, 06:37 PM   #66
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Good job investigating and playing around with the car, seriously. I had read what some V6 owners were saying about the A6 and the low speed issues. I thought it sounded like what my car will do cruising into our neighborhood. I do 30mph or less, that's right between 1st and 2nd and it will "shudder" like what's been described.

As for your grammar, I did mention this to you in another thread but nobody else said a word. I didn't want to get dinged for mentioning it a second time. I will reiterate, you are a very open and honest person.
i stand by what i stated its the codeing my biggest guess is its trying to save you gas and thus trying to climb though the gears too fast boging down the car

why i asked Jeff into this call his GM tech people speak to them reguarding this matter
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Old 08-06-2011, 07:15 PM   #67
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I hate this problem, even going up a hill the car will go in 6th and just start shaking looking for power. I always feel like the car is just constantly shifting in and out of 6th everywhere i go at any speed.
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Old 08-06-2011, 07:30 PM   #68
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Why are you guys driving 45 mph anyway??
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Old 08-06-2011, 07:42 PM   #69
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Why are you guys driving 45 mph anyway??
You have to get to 90 some how lol, No its more of a RPM range of where the problem occurs
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Old 08-06-2011, 07:47 PM   #70
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Good info, bad grammer
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Old 08-06-2011, 07:59 PM   #71
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Strange....I only wind up in 6th gear when I PUT the transmission into 6th gear. LOL

I kid, I kid.....slush boxes have their uses too, I suppose.
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Old 08-06-2011, 08:11 PM   #72
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TL;DR...
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Old 08-06-2011, 09:40 PM   #73
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Originally Posted by Nightfall View Post
and everone else who has been complaining about the V6 A6 vibration at 45 mph ish ruffly around there

so last night i was driveing to work had it in D wanted to cruise to work then i noticed the vibration again from 43 to 45 so i did an exprement

i shifted from D to M cause i had a sneeky susption sence i drive so much in M and i hit the down shift button and BOOM i was driveing in 6th gear doing 45

now when i drive in M i normaly dont even touch 6th gear till i am at 50 the lowest or 55 on ave i cruise 45 to 55 in 5th gear so

i was right in D mode when the computer controls the shifting it shifts WAY to early into 6th and it causes heavy vibration so much so your rear veiw mirror rattles like a bass hit

my only guess for this problum is one of two things A it is programed to save you as much fuel as possible IE get to 6th as fast as possible i notice when your just cruiseing it shifts about 1,800 or below rpm as me in M i shift prefectly at 2,000 on ave or close to it

or B the computer codeing is screwed up and it feels it needs to shift into 6th so damn early eather way the computer should be recoded to shift at a higher speed then 45 it knocks it too low on the RPM and bogs to the point the car vibrates

my only way around this and the main reason i started to drive in M was to avoid this i knew something was worng i never guessed it was the computer shifting time programing ugh

anyhoo anyone else try this i got all shift points down from 1est to 6th IE 10mph shift to 2ed and so forth everone else try this tell me what you think

and Jeff hi if your reading this can you call your tech people asking them about changeing the codeing for the shift points? with out voiding anything to improve a more stable non vibrateing ride? is it possible?

thank you for your time Nightfall (i learn ever car i own to the T and all its flaws)
WTF

If you are trying to say it shifts into 6th to early, I think the people who have a vibration pretty much assumed that already. If you are not saying that, what the hell are you saying?
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Last edited by nyrfan; 08-07-2011 at 08:49 AM.
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Old 08-06-2011, 10:44 PM   #74
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Unfortunately, it seems like the auto tranny's goal in life is it get to 6th gear as fast as humanly (computer controlled) possible. I just leave mine in sport mode all the time. It shifts at redline when you go all out, but even during normal driving, at least it doesn't upshift at 1800 rpm.
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Old 08-07-2011, 12:04 AM   #75
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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.
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