Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com
 
HeadlightArmor
Go Back   Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com > Engine | Drivetrain | Powertrain Technical Discussions > Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons

Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

Reply
 
Thread Tools
Old 08-11-2009, 08:37 AM   #1
CHEVYMANONLY
ChevyMan
 
Drives: Imperial Blue 2SS
Join Date: Aug 2009
Location: Iowa
Posts: 2
SS Automatic Heads up

Beware SS automatic owners : Having problems with resonance in the cockpit at low speeds (30-40mph in town) and cruising speeds (65-80), even with cruise set. I noticed the noise, which comes with a vibration by the way, and immediately drove it in for service. Techs heard the noise as well so did troubleshooting and called tech support at GM. While there, had the GM performance exhaust system put on. Service techs told me nothing was wrong and hoped the exhaust would "drown" out the rumble. WRONG! The deeper throat of the performance exhaust only amplified the noise and vibration to the point that I could not carry on a conversation with the windows up and it even drowned out the stereo at regular listening volumes. Dealer waited for another SS auto to roll in to compare and it is making the same noise/vibration. Apparently when the fuel mgmt system kicks in and drops cylinders it is creating a bog that continuously resonates. I can control it at low speeds by manual shifting but at cruising speeds I have no control and want to go postal by the time I reach my destination ( actually, I can get rid of it cruising by stepping on the gas thus going back to 8 cyl but doesn't that defeat the purpose of the FMS?). Just a constant, loud rumble. I don't want to complain as I love everything else about this car but I can't stand to ride in it on the highway. Here's the kicker, with no fight the dealership is offering to buy the car back and trade me for a same make,model,color only a manual immediately???Good for me but I remain skeptical as to why?? Does GM know or did they know about this problem after production? Is it systemic in all V8 auto's. I'm meeting the district sales Mgr today to discuss the details. More to follow but atleast wanted to get the discussions going to hopefully hear that this is just a problem with a few and not the many. I love this car
Attached Images
 
CHEVYMANONLY is offline   Reply With Quote
Old 08-11-2009, 08:50 AM   #2
Supermans
Camaro & Stang Enthusiast
 
Supermans's Avatar
 
Drives: 2011 Mustang 5.0 in Kona Blue
Join Date: Mar 2008
Location: Miami
Posts: 4,757
Hmm, interesting.. IRPQ nor Scott have complained about any noises.. They did have the problem of "the slows" which is well documented here and still being worked on for a fix by GM.. keep us updated.. I got an LS3 manual and I would recommend you do the same immediately if this noise is driving you bonkers as apparently it is.. With the LS3, it is a constant and pleasant sound that does not drown out the radio with the windows up (The AC at full blast does though) You will be very happy with the LS3 manual..And it has cruise control for the highway as well in the manual which makes it easy for cruising..
__________________
Bought my Camaro from Eric Hall(817) 421-7266
Supermans is offline   Reply With Quote
Old 08-11-2009, 08:54 AM   #3
live2well
 
Drives: 2010 VR 2SS/RS A6
Join Date: Oct 2008
Location: Odenton, MD
Posts: 690
Hmmm......Well I have no issue with interior cabin sound. When I had the stock exhaust and now that I have an aftermarket cat back exhaust there has been no noise issues at all. .....Hmmmm It may be an isolated problem for you.

As far as wanting to buy your car back. Your dealer may want it back to sell to someone else at an inflated price. Who knows.

I will hold my judgment until I get more info on you and your situation.
__________________
Intelligence plus character that is the goal of true education.
BrianC. :flag2:
live2well is offline   Reply With Quote
Old 08-11-2009, 08:59 AM   #4
DDustiNN

 
DDustiNN's Avatar
 
Drives: 2010 Camaro SS/RS
Join Date: Feb 2009
Location: MI
Posts: 1,845
Send a message via Skype™ to DDustiNN
I never noticed this either... I'll have to listen when I get my car back.
__________________
DDustiNN is offline   Reply With Quote
Old 08-11-2009, 09:00 AM   #5
KamaroKirb
Hell's janitor
 
KamaroKirb's Avatar
 
Drives: 1995 Z28 camaro
Join Date: Aug 2009
Location: cleveland, OH
Posts: 120
Your hearing it drop cylinders, but ive never heard anybody complain about this, is it that bad???
__________________
All hail...
KamaroKirb is offline   Reply With Quote
Old 08-11-2009, 11:56 AM   #6
68blk/yel396
 
68blk/yel396's Avatar
 
Drives: 2011 RJT 2SS/RS
Join Date: Apr 2009
Location: Katy, Texas
Posts: 425
SS Automatic Heads Up

I have over 5000 miles on my 2SS Automatic and can't say that the drone or resonance from the AFM system in the cabin is a problem. I can tell you that you can have the AFM turned off by a performance tuner and your car will never revert to 4 cylinders. I also have a CAI on my car, and with the tune, improved the HP on average by 22 and the torque by 31 over stock. The car runs so much better, the shifting range is extended, and the higher torque is very noticable throughout the speed ranges. By the way, I left my AFM on.
68blk/yel396 is offline   Reply With Quote
Old 08-11-2009, 11:59 AM   #7
OC CAMARO
 
Drives: 2010 black 2SS Camaro
Join Date: Jul 2009
Location: OC
Posts: 40
It happens on mine too. It is quite annoying, especially because I have the zoomers exhaust so it is very loud. Usually I just paddle shift and it becomes manageable.
OC CAMARO is offline   Reply With Quote
Old 08-11-2009, 12:49 PM   #8
DanD
 
DanD's Avatar
 
Drives: 6 camaros
Join Date: Feb 2009
Location: ma
Posts: 320
have someone turn the AFM off, I swear it doesn't lose mpg anyway.. and this should not void anything IMO..... but of course they can say what they want.
__________________
2010 IOM RS/SS TVS2300, cam, stall, headers
2002 Z28 427
2002 SSLE Convertible
1968 383 Camaro
1968 327 Camaro Convertible
1967 RS 327
1967 Pro-Tour LS3 in progress
DanD is offline   Reply With Quote
Old 08-11-2009, 02:15 PM   #9
Tomato
G-Force Addict
 
Tomato's Avatar
 
Drives: 2010 SS/RS A6
Join Date: Jul 2009
Location: Escalon, CA
Posts: 196
Definitely an annoyance. I usually downshift to 5th and keep the revs above 2,200 or so and it goes away...This does defeat the purpose of the AFM, but I'm not worried about that.
Tomato is offline   Reply With Quote
Old 08-11-2009, 02:28 PM   #10
Edrock

 
Edrock's Avatar
 
Drives: '10 Camaro 2SS LS3
Join Date: Jan 2009
Location: Jamestown, NC
Posts: 964
Cool looking Bassett Hound in the background. Had one myself. The coolest dogs...And beautiful car too. Ordered one just like it (except manual). ....sorry...back on topic...
__________________
DT Shorties, Solo hi-flow Cats, X-pipe, resonator delete, Flowmaster Super-44s, VMAX TB, Stronger MAF, C.A.I. Intake with race scoop, and JRE Tune!
WOT is my happy place!!
Edrock is offline   Reply With Quote
Old 08-11-2009, 02:33 PM   #11
69 rs/ss
 
69 rs/ss's Avatar
 
Drives: 1969 rs/ss & 2010 L99 #3747 4/28/09
Join Date: Oct 2008
Location: Albion, NY
Posts: 325
4,800 miles on my 1SS A/6 and never noticed and noise at any speed.
69 rs/ss is offline   Reply With Quote
Old 08-11-2009, 02:36 PM   #12
ToddSS
ZZ Motorsports Sales Rep
 
ToddSS's Avatar
 
Drives: 2010 SIM 1SS
Join Date: Jul 2009
Location: moving to Texas
Posts: 149
Thanks for the heads up but so far we haven't heard any noise like your describing. 1k miles on it now.
ToddSS is offline   Reply With Quote
Old 08-11-2009, 02:41 PM   #13
CamaroSue
 
CamaroSue's Avatar
 
Drives: 2002 Z28, 2011 Corvette GS
Join Date: Mar 2009
Location: Suburban Chicago
Posts: 162
I havent noticed this noise either. I dont know what "the slows" is. I'll have to do a search on that and find out.

Ohhhhhhh.......they are saying its slow!!!! This car is definitely not slow!!!! So, it never occurred to me thats what it meant!!!!
CamaroSue is offline   Reply With Quote
Old 08-11-2009, 02:43 PM   #14
Ultimate Performance
 
Ultimate Performance's Avatar
 
Drives: 2010 Camaro L99
Join Date: Jul 2009
Location: Florida
Posts: 73
No issues on ours either....
Ultimate Performance is offline   Reply With Quote
Old 08-11-2009, 02:45 PM   #15
TomServo
 
Drives: 2007 Z06
Join Date: Oct 2008
Location: Swansea IL
Posts: 727
If you turn off the AFM does it gain back the 26HP??
TomServo is offline   Reply With Quote
Old 08-11-2009, 02:49 PM   #16
BrianGriffin78

 
BrianGriffin78's Avatar
 
Drives: 2009 GMC Yukon
Join Date: May 2009
Location: New York
Posts: 920
I have 3400 miles on my 2SS, and have not heard any noises, except when the window is open, but that is just the wind hitting the open seams, so it's normal. My car is running even better now, imo.
__________________
BrianGriffin78 is offline   Reply With Quote
Old 08-11-2009, 03:28 PM   #17
Ultimate Performance
 
Ultimate Performance's Avatar
 
Drives: 2010 Camaro L99
Join Date: Jul 2009
Location: Florida
Posts: 73
Chevyman...tell the dealership we will buy the car for a dollar. Really
Ultimate Performance is offline   Reply With Quote
Old 08-11-2009, 03:30 PM   #18
Supermans
Camaro & Stang Enthusiast
 
Supermans's Avatar
 
Drives: 2011 Mustang 5.0 in Kona Blue
Join Date: Mar 2008
Location: Miami
Posts: 4,757
Quote:
Originally Posted by TomServo View Post
If you turn off the AFM does it gain back the 26HP??
no..
__________________
Bought my Camaro from Eric Hall(817) 421-7266
Supermans is offline   Reply With Quote
Old 08-11-2009, 03:58 PM   #19
SGOS252382


 
SGOS252382's Avatar
 
Drives: 2010 Camaro 2SS/RS
Join Date: Mar 2008
Location: S.W. Florida
Posts: 6,106
What's your exhaust setup?
When my car was 100% stock, it was very quiet all the time.

Now I have the GMPP off road axle back and my car is tuned, I get an exhaust sound on the transition from 4 to 8 cylinders. But it seems to be mostly related to the aggressive transmission tune.
And I had a buddy from work take a ride in my car today and he said it sounded great (and he never picked up on the AFM sound). He was absolutely blown away by the car's peformance.

When crusing at 60-80mph its still very quiet when cruising. The only time I get a noise is when I get on the gas and I can hear the AFM transition. But other than that I have no drone or vibration. But with a full exhaust setup (headers, high flow cats, exhaust) I could definately see the AFM setup becoming a annoying noise.

The next time I get my car tuned, I will most likely have the AFM turned off.
__________________
SGOS252382 is offline   Reply With Quote
Old 08-11-2009, 04:33 PM   #20
PQ
1st State Chevy supporter
 
PQ's Avatar
 
Drives: Hybrid SS Camaro
Join Date: Apr 2008
Location: Mobile, AL
Posts: 36,522
Send a message via Yahoo to PQ
Quote:
Originally Posted by TomServo View Post
If you turn off the AFM does it gain back the 26HP??
....................



I've not heard the noise the way it's described. Of course I'm not sure I've had the windows up and the radio off yet.

I do still hear the tranny 'whine' at very low speeds if I listen closely. But I think it's normal.
__________________
PQ is offline   Reply With Quote
Old 08-11-2009, 04:48 PM   #21
ZombieEatsYou

 
ZombieEatsYou's Avatar
 
Drives: "Bmblbee" 2010 RY 2SS/RS. VIN 12043
Join Date: Oct 2008
Location: Waldorf, Maryland
Posts: 1,338
No obnoxious noise with me either. Just went over 1K miles stock everything.
__________________
ZombieEatsYou is offline   Reply With Quote
Old 08-11-2009, 04:52 PM   #22
patriotpa
Account Suspended
 
Drives: 02 Silverado, 09 Vue, 10 1SS
Join Date: Aug 2008
Location: Tired of apologizing when we should be kickin' butt!
Posts: 1,967
You hear a resonance? I have a 1SS L99 and I hear NO difference. Quiet as can be until I romp on the gas. Weird.
patriotpa is offline   Reply With Quote
Old 08-11-2009, 05:27 PM   #23
Missile Man
 
Missile Man's Avatar
 
Drives: 2010 2SS/Black
Join Date: Mar 2009
Location: Tucson, AZ
Posts: 347
1k mile and no exhaust noise. Turned off the radio and A/C the other day and was super quiet. Installing a SLP Loudmouth II this weekend, we'll see if there is any noticeable change.
__________________
2010 Black SS Auto

Mods:
Vector Motor Sports Tune - ECM No AFM/Trans Stage I
CAI Intake
Stainless Power LT/Hi Flow Cats/Tru X-Pipe/40 Series
Missile Man is offline   Reply With Quote
Old 08-11-2009, 06:01 PM   #24
muSScle
 
muSScle's Avatar
 
Drives: 2010 Camaro 2SS/RS
Join Date: Jul 2009
Location: Northern Michigan
Posts: 32
Also have a noticeable drone after GMPP install

I had the GMPP (axle back, not off-road) system put on Friday, much more noticeable drone at low speeds 20-30 mph.... also around 55-60 cruising.... definately the AFM..... the CAI (Hennessey) seems louder than the exhuast when standing on.... pretty quiet setup.... auto trans, 600 miles.....
__________________
"A WINNER IS WILLING TO DO WHAT THE LOSER WON'T"
muSScle is offline   Reply With Quote
Old 08-11-2009, 06:21 PM   #25
Shadowmind
 
Drives: 2010 2SS - IOM, fully loaded
Join Date: May 2009
Location: Seattle WA
Posts: 216
I definitely feel the bog down in mine. This seems to be a problem with the Auto not downshifting from 4th to 3rd or 2nd at low rev/slower speeds. This is a problem that has been in the L99 since it came out for the Corvette. The 'slows' or bog down basically happens when you slow down from say... 40, to 25 in a short period of time. The tranny 'should' downshift to 3rd gear, but it doesn't. It stays in 4th, and you feel the car running 'sluggish'. If you give a quick gun, all 8 pop in and it doesn't feel as sluggy, but then again, a quick pop will boost you 5-10 mph in a matter of micro-seconds. :P

Your vibration problem is probably coming from something loose in the engine housing, or maybe in front of the cats/headers. The bog down would emphasize that vibration a lot.
Shadowmind is offline   Reply With Quote
 
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Review of my Camaro SS (Rental from Avis) clan0013 5th Gen Camaro SS LS LT General Discussions 19 02-15-2010 05:10 PM
What does "SS" stand for? LDGn63 5th Gen Camaro SS LS LT General Discussions 208 01-11-2010 09:00 PM
Magnaflow 2010 Camaro SS Systems JDP Motorsports V8 Bolt-Ons & Tunes 61 12-12-2009 12:13 PM
65 Camaro's to choose from. tony_c Camaro Price | Ordering | Tracking | Dealers Discussions 25 08-29-2009 03:25 PM
5 Speed Mustang Automatic vs 6 speed Camaro Automatic ColoCamaro Chevy Camaro vs... 23 06-09-2009 04:40 PM


All times are GMT -5. The time now is 01:29 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.