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Old 07-08-2011, 03:56 PM   #51
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AFM is the Active Fuel Management system on the vehicle. Sometimes when it makes it's change over from the full 8 cylinders to the 4 cylinders it can cause a vibration in the vehicle which is what some SS owners may be experienceing. I hope that answers your question domano 68.

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Old 07-08-2011, 10:26 PM   #52
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I'm very sorry to see all of you who are having issues with these vibration issues. I have escalated this to my technical department once before and the answer I got back was that for the V6 vehicles it could be the tires or the wheels (or a combination of both) or aftermarket accessories (and other things of that nature). For the V8's it could be the AFM and those problem parts for the V6 as well. This is not a definitive list of possibilities. I would suggest getting your balance and alignments checked to make sure there isn't something wrong with the way the vehicle is setup. Then I would move on to some of the other things on the list that may be suspect as well. Once again I'm sorry to see so many of you having trouble with this and I have checked multiple times and have been unable to find any kind of documentation that would suggest there is an issue with the vehicle outside of what I've given you here.

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Thanks for the reply Jeff,

I will take it in and have the balance checked. My vehicle is completely "as delivered" stock, 2SS manual, so no AFM. The vibration is relatively high-frequency, and feels more like drive-train than wheels/tires to me, but will have it checked out. The 4th gen cars had a bit of an issue with some slightly out of balance drive shafts that caused a very similar behavior, so I'm wondering if it could be related to that. It seems to change slightly when you push in the clutch and coast.
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Old 07-12-2011, 11:19 AM   #53
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I'll have to check with my technical department to see if there is anything that we might be working on that would be related to this. I will pose this question to them and we'll see what I get back.

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Old 07-12-2011, 12:02 PM   #54
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I had this issue on my 98 Z28 when it was new, it was warped rotors. Went thru 3 sets of oem's on the front under warranty. After replacing them with after market from NAPA never had the issue again.
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Old 07-12-2011, 02:47 PM   #55
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Originally Posted by Chevrolet Customer Svc View Post
I'm very sorry to see all of you who are having issues with these vibration issues. I have escalated this to my technical department once before and the answer I got back was that for the V6 vehicles it could be the tires or the wheels (or a combination of both) or aftermarket accessories (and other things of that nature). For the V8's it could be the AFM and those problem parts for the V6 as well. This is not a definitive list of possibilities. I would suggest getting your balance and alignments checked to make sure there isn't something wrong with the way the vehicle is setup. Then I would move on to some of the other things on the list that may be suspect as well. Once again I'm sorry to see so many of you having trouble with this and I have checked multiple times and have been unable to find any kind of documentation that would suggest there is an issue with the vehicle outside of what I've given you here.

Jeff Morris, Chevrolet Customer Service
thank you jeff but i notice its more a transmission issue cause when i drive in manual mode it happens when the car bogs or gets down in low RPM worse in automatic

like i mentioned before its like the car is hestent to shift like its trying to save fuel or something if i am in manual no problum i can just tap boom lower gear im learning the shift points

is this normal?

*edit* again around the 40 to 45 mph mark it seems like its up one gear too high for the speed its at though i could be wrong i know this car (like most cars) is built to shift quickly to get up gears fast as possible to save you gas thats why i like manual better i can upshift slower but anyhoo lol typeing too much here
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Old 07-12-2011, 05:14 PM   #56
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Center driveline carrier bearing

I had a vibration that started at about 110 mph shortly after I bought my 2SS 6M new.
After the miles started clicking on, the vibration would come in at speeds as low as 81 mph.
I had become so used to it that I could tell what speed I was going by the oscillation I was feeling in the chassis. I displayed this "talent" to the dealership service manager after they didn't feel anything the first time.
Anyway, long story short, it was the center driveline carrier bearing, it was shot, they replaced the entire driveline which I was told includes the bearing and no more vibration.

Just my .02

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Old 07-15-2011, 12:41 PM   #57
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Nightfall, I just looked through some documentation and found a diagnosis guideline for vibrations in the driveline/transmission which should help in pinning down what you and others are experienceing. You may want to check in with your dealership and see if you can reproduce the vibration for them and see if they know of this document. Unfortunately I can't get any more specific than "this document". I hope that helps you.

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Old 07-17-2011, 11:50 AM   #58
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Have the dealership check the driveshaft bolts. Mine have loosened or removed themselves a couple times. It starts as a slight vibration and will only get worse.
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Old 07-17-2011, 11:55 AM   #59
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Question

Quote:
Originally Posted by Chevrolet Customer Svc View Post
Nightfall, I just looked through some documentation and found a diagnosis guideline for vibrations in the driveline/transmission which should help in pinning down what you and others are experienceing. You may want to check in with your dealership and see if you can reproduce the vibration for them and see if they know of this document. Unfortunately I can't get any more specific than "this document". I hope that helps you.

Jeff Morris, Chevrolet Customer Service
"this document" so i go into my dealer and go i know "this document" about driveline/transmission? weird lol im confused on what i should talk to my dealer about

and i have brought it in once befor acouple weeks ago and one of there techs drove with me and he felt it too and i brought it back down acouple days later to have it checked out

they ran a full test on it he sereched for recall parts ect ect found nothing

then they had a white 1LT RS on the lot i took that out for a test drive and felt the same vibration but not nearly as bad as on mine so its a mystery

so what would you suggest if i brought it back to the dealer to ask or tell them to look for?
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Old 07-18-2011, 03:16 PM   #60
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I would say to ask them to go through their diagnosis procedures and vibration checklists to see if they can't turn something up by going through and checking it over thoroughly. If you would like I could make a call to your dealer to try and discuss it with them to see if they could go through the document an your vehicle. All I would need is your name phone number and their phone number. I hope this helps.

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Old 08-16-2011, 07:20 AM   #61
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Still monitoring this thread for anything new resolution-wise to the high speed vibration. TIA!
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Old 08-31-2011, 04:44 PM   #62
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I had this issue also., what I did was rebalance my wheels 3 times. It ended up being, that the wheel balancing machine needed to be re-callibrated. And now I don't have any vibrations at any speeds. I have after market wheels too.
My ride only has 6900 miles on it, and my dealership is in the oppisite direction of my emplyoer. I hate going to the dealership even though mine is great. I got tired of waiting around for you guys to figure this out so I took it to the dealership.

I didn't have to have mine balanced 3 times Stephens, only 2 times. FINALLY no more vibes. Dealership road forced balanced, checked run-out finding no problems. Went for a test drive, problem was slightly worse. Told them to do it again, problem gone! Weight must have fell off the first time. Smooth as silk.

The above 70 mph vibration issue in the seat and sterring wheel is a balancing issue. Hope this helps someone else out there.
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Old 08-31-2011, 05:57 PM   #63
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Hmmm, lets see it this matches up with anyone that drove down I-95 to South Dixie in Miami.

I get a swaying feeling on a few spots, before the exit for Key Biscayne and after that exit is one of the area. THe area between the interstates to Miami Beach has a few areas as well.

Its like a drifting feeling, which makes me turn off the radio to listen for any and all sounds. I need to take my car in, but thats not happening until some time in October.
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Old 07-15-2012, 01:32 PM   #64
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I have a brand spanking new 2012 2SS/RS L99 with 421 miles and the vibration is between 40-50 mph. It's not AFM (don't ask how I know). Taking to dealer tomorrow. I agree with one of the other posters. For a car that costs this much, it shouldn't be vibrating.
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Old 07-15-2012, 01:44 PM   #65
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Lol my truck does this, but I have also been told it could be the transmissions slipping, so hopefully they don't all have transmission issues lol.... I also have 35" super swampers which I have tore up so it could be that but when it starts vibrating floor it and it goes away or let off the gas and it goes away??? Ps i have a old dodge ram not even a chevy lol, workin on my Camaro though =]
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Old 04-10-2013, 05:42 PM   #66
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I would just like to follow up here..

This issue on the L99 (automatic cars) is according to GM said to be a result of the AFM (active fuel management). I was able to get them to find something in their system about this. The bulletin no. is #06-06-05-001E.

I am sorry I am unable to post it but maybe a google search will turn this up?

Anyhow, it explains how vehicles with the V8 auto will experience a roughness, rough ride, vibration in seat, car or rear view mirror when this happens. May also be felt in the floor pan, gas pedal or steering wheel. There is also a notable change in the exhaust note when the AFM kicks in and drops it down to 4cyl mode.

Outcome is the good 'ol this is normal and there is nothing to be worried about. They're not addressing this with any type of fix. This to me in BS! Like I am happy that I was able to find out this is the AFM system and not a tranny issue or something but, really!? How do other manufactures find a way to make this vibration non-existent in their products ? Apparently this is not noticed in the Silverado for example with the 5.3L which also uses AFM technology to save fuel.

Point being is it's pretty ridiculous, especially since I really love the car and the thrill of driving it. When this vibration kicks in I feel it up my spine (so to speak) and it really does take a lot away from the driving experience. It's really too bad.

I hope this helps some of you who are noticing this in terms of having an answer on what it was you've been experiencing.
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Old 04-10-2013, 07:00 PM   #67
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Had a 2011 1LT auto trans and it had the vibration traded for a 2012 1SS and no vibration.
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Old 04-12-2013, 01:38 PM   #68
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Did you trade up just for the SS, or due to the vibration ?
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Old 04-29-2013, 10:20 AM   #69
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Noticed the problem on the test drive between 55 -60 MPH, and noted it on the delivery paperwork. The car was just built in February.
Very slight shimmy in the steering wheel.
By the time I drove it 50 miles home, it had disappeared.
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Old 04-29-2013, 05:28 PM   #70
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Have not experienced this on my Camaro, but on another car it came down to crappy tires. Not even road force balancing would make it go away, but all is well with new tires.

As for flat spotting of OEM P-zeros: nonsense. My Camaro has sat through three winters, not moving for 6 months, and flat spotting goes away after a few hundred yards.
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Old 05-14-2013, 08:50 AM   #71
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I had the shaking steering wheel issue so bad I ended up trading in my camaro SS for another Camaro. GM tried to help and I had the case escalated all the way up to the executive offices but the dealership (Classic Chevrolet, Sugarland, TX.) just made up excuses (my car hit a wall was my favorite reason because I would have remembered hitting a wall in my car.) and wouldn't address the problem unless I payed for stuff. New tires, balance, rotor work, alignment, nothing fixed the problem. None of this was needed obviously but hey they got money and that was much better than helping a customer.

Also, this dealership allowed me to drive another customer's Camaro that was left over night for an issue to see if their's had the same issue. I'm thinking I know why my car probably had problems (THEY LET CUSTOMERS DRIVE OTHER CUSTOMERS CARS.) I'd have been livid if I found out someone else was allowed to take my car out for a drive. I was extremely gentle with the person's car I borrowed because it felt wrong even being in it but they wouldn't let me test a new Camaro on the lot... (I guess this is the point where I should have asked if another person drove my car and hit that wall they were talking about while my car was there for a few days being looked at. Unfortunately I'm not confrontational.)

After 5 MONTHS of my steering wheel shaking constantly while driving and after 8 times in the shop I was told to take my car to a different dealership by GM. The dealership (Westside Chevrolet, Katy, Texas which is the WORST dealership I've ever been to. They messed up my parents Impala and took four times to fix the oil leak they caused. Unfortuantely I didn't have many more choices when it came to another dealership.) handed me my keys back and told me they wern't interested in looking at my vehicle. I told them GM said they wanted them to lok at it and get a second opinion. They once again asked me to leave because they "Didn't have the time to look at a vehicle that had been having issues at another dealership even if GM asked for them specifically."

I could have probably caused them a lot of problems with a response like that but I was so angry I drove to another dealership and traded my car in that day and got a ZL1. I'd say I ended up winning in the long run.

Yes... that was a long rant... Sorry about that.
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Old 05-19-2013, 01:25 AM   #72
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Still trying to figure this problem out as well. Broke my loose drive shaft bolts but car still does it. I've done alignment and tire balancing as well. I'm on my stock Ls wheels and its still has the vibration under load and after 75 mph.hope someone can figure out the problem.
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Old 05-20-2013, 09:55 PM   #73
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I have this vibration on my car recently also. Started suddenly. I have aftermarket wheels but they were fine for a while. Sudden start to the vibration just a few days ago. Had the wheels rebalanced. Did nothing. I'm about to trade this POS in on a 5.0 and never look back. I've always been a Chevy guy but we are getting crapped on and getting no support from GM or the dealerships that are supposed to do the work.
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Old 05-21-2013, 09:19 AM   #74
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I have this vibration on my car recently also. Started suddenly. I have aftermarket wheels but they were fine for a while. Sudden start to the vibration just a few days ago. Had the wheels rebalanced. Did nothing. I'm about to trade this POS in on a 5.0 and never look back. I've always been a Chevy guy but we are getting crapped on and getting no support from GM or the dealerships that are supposed to do the work.
Yup. They almost lost me when they wouldn't address my problem and tried to blame me for the vibration. They already had my money so why bother with helping fix the issue. As long as I had to keep spending money to try to fix my car they were happy.
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Old 05-21-2013, 11:45 PM   #75
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So finally confirmed it was my drive shaft bolts. Snapped three bolts off and replaced with dss aluminum driveshaft.therewasdamaged to the exhaust when the driveshaft bolts broke. Fixed exhaust today an no vibration at all.hopes this helps
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