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Old 08-12-2009, 01:13 PM   #1
taspec
 
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FUEL MANAGEMENT AND WIERD SOUND OF EXHAUST

I OWN A 2010 CAMARO SS , V8 L99 ENGINE, AUTOMATIC TRANSMISSION, WE ONLY CUT THE REAR MUFFLER AND REPLACED FOR A STRAIGHT TUBE JUST TO MAKE MORE MUSCLE CAR SOUND. THE PROBLEM IS WHEN THE CAR GOES IN 4 CILINDER MODE (AFM)_MAKES AND UGLY NOISE WITH VIBRATION. THERE IS ANY WAY TO FIX THIS? I READ THAT GM DOESN'T OFFER A FIX, HAVE ANY OF YOU HEARD ANYTHING ABOUT THIS?
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Old 08-12-2009, 02:01 PM   #2
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Seriously, what's with people and the Caps Lock button?

And no, haven't heard of this before.
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Old 08-12-2009, 02:25 PM   #3
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Just talked to GM engineers about this yesterday. They need lots of exhaust volume area to deadend the 4 cylinder sound. Guess what you cut out your mufflers and just got rid of a lot of volume area.

There will be no fix for that from GM.
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Old 08-12-2009, 02:25 PM   #4
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You can get your AFM tuned out. It will fix this.
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Old 08-12-2009, 02:40 PM   #5
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This is posted in another thread...

http://www.camaro5.com/forums/showthread.php?t=36816
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Old 08-12-2009, 02:41 PM   #6
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"You can get your AFM tuned out. It will fix this."


And say goodbye to your drive train warranty.
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Old 08-12-2009, 02:46 PM   #7
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You will get the car you really wanted
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Old 08-12-2009, 03:59 PM   #8
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You will get the car you really wanted
with no coverage from GM if something randomly goes boom.
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Old 08-12-2009, 04:23 PM   #9
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Scott is right about the mufflers.

Or, you can go to M in sport mode and paddle shift which will affect your mileage a little.
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Old 08-28-2009, 10:21 PM   #10
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I don't get it. the new Hemi has a fuel management system, and it doesn't have any of the problems this Camaro has. I own both, made the same changes to both cars. the hemi improved, no hesitation, no noises. the hemi fuel management doesn't kick in until you reach criusing speeds. This should be an easy fix for Gm.
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Old 09-25-2009, 05:53 PM   #11
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I have this same problem. If you barely get on it no matter what gear as long as it is around a grand you get exhaust drone. I took it to a dealer and they have a bulletin put out on it. They told me the same thing as some of the other posts. That it is in fact the AFM System. That if you put it into M that it will eliminate the noise. The thing that is irritating me is that you shouldn't have to in order to solve the problem. They said that there isn't a fix for it, although it isn't hurting anything. Anyone else come across a solution for this other that driving in M?
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Old 09-25-2009, 07:33 PM   #12
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Just keep your foot in it all the time, then you'll never hear it.
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Old 09-25-2009, 08:43 PM   #13
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Just keep your foot in it all the time, then you'll never hear it.
Yeah see that is the thing... There are ways around the problem. There is no denying that. The thing is that there shouldn't be a problem to begin with. There is no solution to fixing the actual problem besides covering it up or avoiding it.
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Old 09-25-2009, 09:19 PM   #14
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Program and set it to deactivate below 55mph (stock it is set at 9mph). Works like a charm and still get good gas mileage on the highway
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Old 09-26-2009, 04:29 AM   #15
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Program and set it to deactivate below 55mph (stock it is set at 9mph). Works like a charm and still get good gas mileage on the highway
And kiss your warranty good bye on the drivetrain.
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Old 09-26-2009, 05:45 AM   #16
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And kiss your warranty good bye on the drivetrain.
No way can moving the activation speed do any harm to any part of the system.
If you have a problem and need to return for warranty simply put the stock tune back and take it in.
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Old 09-26-2009, 06:26 AM   #17
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the computer on our cars are just like our computers at home. every key stroke, every page, everything can be traced back.
So I think your wrong, in fact, I know your wrong.
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Old 09-26-2009, 06:52 AM   #18
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the computer on our cars are just like our computers at home. every key stroke, every page, everything can be traced back.
So I think your wrong, in fact, I know your wrong.
Not going to argue but I know of several tuned and having warranty work performed with no problems. Just got one back with a new trans to be re-tuned.
If you are not comfortable with it then dont do it.
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Old 09-26-2009, 07:01 AM   #19
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I have L99 with muff delete and the car sounds great! I don't know if my shop did something different but I've gotten nothing but compliments on how it sounds with people riding with me.
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Old 09-26-2009, 08:22 AM   #20
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GM can tell if the car has been tuned. There is a huge tech note that is posted somewhere on this site that says ANY change to the progamming from of the engines ECM or Trannies computer will void the entire drive train warranty.

I do not want to argue with any of you but giving people advice about tuning something one their car without them possible knowing they will lose their drivetrain warranty is not cool. You should state that when you say get it tuned out but you take a huge risk of losing your drivetrain warranty would be a better than to do than just saying tune it out.
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Old 09-26-2009, 09:16 AM   #21
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M6 solves this problem.
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Old 09-26-2009, 09:32 AM   #22
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so glad i have the 6spd manuel
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Old 09-26-2009, 09:46 AM   #23
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Quote:
Originally Posted by taspec View Post
I OWN A 2010 CAMARO SS , V8 L99 ENGINE, AUTOMATIC TRANSMISSION, WE ONLY CUT THE REAR MUFFLER AND REPLACED FOR A STRAIGHT TUBE JUST TO MAKE MORE MUSCLE CAR SOUND. THE PROBLEM IS WHEN THE CAR GOES IN 4 CILINDER MODE (AFM)_MAKES AND UGLY NOISE WITH VIBRATION. THERE IS ANY WAY TO FIX THIS? I READ THAT GM DOESN'T OFFER A FIX, HAVE ANY OF YOU HEARD ANYTHING ABOUT THIS?
A rattle and vibration sounds like something is loose on the exhaust. You need to find what is rattling and anchor it. Take it to a good exhaust place and they will put it on the lift with someone in it to hit the gas and hear where it is coming from. Even though you hear it when the AFM kicks in, it is probably doing it some when the car is running on a full 8 and can be pinpointed!
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