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Old 04-04-2010, 06:22 AM   #1
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Exclamation AFM TURN OFF

Hey Guys

Other than voiding my drive train warranty, Are there any short or long term mechanical problems that might arise if I tune out the AFM?

It is driving me crazy at slow speeds under light loads!!!
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Old 04-04-2010, 07:22 AM   #2
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You should have no problems what so ever.
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Old 04-04-2010, 08:27 AM   #3
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Quote:
Originally Posted by SKERIS View Post
Hey Guys

Other than voiding my drive train warranty, Are there any short or long term mechanical problems that might arise if I tune out the AFM?

It is driving me crazy at slow speeds under light loads!!!
I'm about to sell the car over this problem. I drive in manual all the time keeping the rpm's up so it doesn't shut down cylinders. I talked to the dealer about it and he said GM would have to initiate a fix before they could do anything. Anybody know what can be done. Thanks
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Old 04-04-2010, 08:37 AM   #4
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Originally Posted by mthompso View Post
I'm about to sell the car over this problem. I drive in manual all the time keeping the rpm's up so it doesn't shut down cylinders. I talked to the dealer about it and he said GM would have to initiate a fix before they could do anything. Anybody know what can be done. Thanks
There's really no fix because it's not broke... However you can buy a handheld tuner and very quickly turn off AFM. Just put it back to stock when you go in for maintenance. It's highly debated on whether this can be detected and I think it can IF they really look for it, but if your dealer knows your situation common sense should prevail when getting warranty work since this would not hurt your car in any way.
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Old 04-04-2010, 08:58 AM   #5
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Originally Posted by mthompso View Post
I'm about to sell the car over this problem. I drive in manual all the time keeping the rpm's up so it doesn't shut down cylinders. I talked to the dealer about it and he said GM would have to initiate a fix before they could do anything. Anybody know what can be done. Thanks
Don't sell. Get yourself a tuner, something like a Diablosport Predator or SCT and turn it off. About $300 bucks and problem solved. Just remember to reload the original tune prior to going in for any warranty work. I have the Predator and it is very simple to use. Mine is an M6 but I have a friend that used one to turn off his AFM on an A6 and he loves the car now. And if you wanted to improve the shift characteristics, some of the tuners will also do that. I think the SCT will, and Predator will soon from what I understand.

I turned AFM off in my Silverado about a year ago. Much more enjoyable to drive, it isn't ever coming back on. Making a small block chevy run on 4 is about the most idiotic thing since the Caddy 4-6-8. I'm sure the tree huggers will love the .1 th increase in mpgs, but the reality is if I wanted a 4 banger I would have bought one.
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Old 04-04-2010, 09:11 AM   #6
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I am taking my car in to a shop to have a Pfadt sport suspension and Kooks LT headers installed and when they do that, they are going to dyno the car and do a tune including shutting off AFM.

I know this will void my power train warranty. But me wants. I bought the car strictly for the joy of driving it. I'm adding more joy. Ya gotta pay to play.
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Old 04-04-2010, 09:12 AM   #7
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When I had my supercharger installed by MIKE NORRIS MOTORSPORTS up in Indy he turned my off on my L99. It's a different car now. I too use to keep mine in manual mode all the time to help control the noise. When I installed my headers and 3" exhaust it magnified the problem. Find a good tuner close to you who can hook up to your car and and turn it off and while you're at it just go ahead and throw a tune on it. You'll love it. PM me if you have any questions I can help with.
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Old 04-04-2010, 09:13 AM   #8
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Quote:
Originally Posted by SKERIS View Post
Hey Guys

Other than voiding my drive train warranty, Are there any short or long term mechanical problems that might arise if I tune out the AFM?

It is driving me crazy at slow speeds under light loads!!!
Yup , mee too, but not crazy. Why would we have problems using all 8 cylinders


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You should have no problems what so ever.
+1
Quote:
Originally Posted by mthompso View Post
I'm about to sell the car over this problem. I drive in manual all the time keeping the rpm's up so it doesn't shut down cylinders. I talked to the dealer about it and he said GM would have to initiate a fix before they could do anything. Anybody know what can be done. Thanks
Initiate a fix ??? Like what?? I think is they turned down the threashold to like 1000 rpms that would fix it and still leave it there.

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There's really no fix because it's not broke... However you can buy a handheld tuner and very quickly turn off AFM. Just put it back to stock when you go in for maintenance. It's highly debated on whether this can be detected and I think it can IF they really look for it, but if your dealer knows your situation common sense should prevail when getting warranty work since this would not hurt your car in any way.
Interesting. Is there a counter when you make changes? And if there is that doesn't mean they know what changed? What kinds of turners are good for this ????

Quote:
Originally Posted by Russell James View Post
Don't sell. Get yourself a tuner, something like a Diablosport Predator or SCT and turn it off. About $300 bucks and problem solved. Just remember to reload the original tune prior to going in for any warranty work. I have the Predator and it is very simple to use. Mine is an M6 but I have a friend that used one to turn off his AFM on an A6 and he loves the car now. And if you wanted to improve the shift characteristics, some of the tuners will also do that. I think the SCT will, and Predator will soon from what I understand.

I turned AFM off in my Silverado about a year ago. Much more enjoyable to drive, it isn't ever coming back on. Making a small block chevy run on 4 is about the most idiotic thing since the Caddy 4-6-8. I'm sure the tree huggers will love the .1 th increase in mpgs, but the reality is if I wanted a 4 banger I would have bought one.
Here are some of my questions already answered
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Old 04-04-2010, 09:17 AM   #9
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Is it really that bad? I have an LS3 so I wouldn't know but is it that annoying? What does it do to annoy you guys? Does it not switch back fast enough to 8 cyl mode?
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Old 04-04-2010, 09:27 AM   #10
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Tune it out. You will not regret it.
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Old 04-04-2010, 09:33 AM   #11
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Is it really that bad? I have an LS3 so I wouldn't know but is it that annoying? What does it do to annoy you guys? Does it not switch back fast enough to 8 cyl mode?
IMHO, in a stock car, it's not that bad. I don't really notice it. The only change I've made to my car from stock so far is a CAI intake. However, many L99 owners who have put on a new exhaust find that at highway speeds, the AFM produces a VERY annoying drone.

Also, the AFM really doesn't produce much improvement in fuel economy. My understanding is that it might add only 1 or 2 mpg. I believe AFM was only put in the car by GM as a gimmick to bypass the gas guzzler label for the car.

I am going to have the AFM turned off when I get my headers and a tune.
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Old 04-04-2010, 04:46 PM   #12
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Interesting. Is there a counter when you make changes? And if there is that doesn't mean they know what changed? What kinds of turners are good for this ????
Yes... I didn't want to get this discussion going once again that's why I said be open with your dealer and let them know your concerns. I use Diablo just for this and it works great.

This also doesn't apply to the OP since he's probably already got his answer.
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Last edited by mlee; 04-04-2010 at 08:18 PM.
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Old 04-04-2010, 06:37 PM   #13
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Thanks for the good information. Maybe some day too I'll have 3,751 posts.
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Old 04-04-2010, 06:40 PM   #14
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Tune it out. You will not regret it.
We did and it's so much better! It was driving us nuts. Besides, we didn't buy this car for the gas mileage.
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Old 04-04-2010, 06:58 PM   #15
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I side stepped the issue and just got the 6 good cylinders.
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Old 04-04-2010, 07:34 PM   #16
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I'm not sure where the problem is, I have the Borla cat/back exhaust and no drone. When I hit the gas I'm gone. So what would tuning out the AFM get me?
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Old 04-04-2010, 08:20 PM   #17
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Thanks for the good information. Maybe some day too I'll have 3,751 posts.
Post edited... you are the man... I've seen threads go on for pages on a good question like yours.

Welcome to the forum...
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Old 04-04-2010, 08:48 PM   #18
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Tune it out. You will not regret it.
+1000
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Old 04-05-2010, 02:36 AM   #19
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AFM on the L99 A6

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Is it really that bad? I have an LS3 so I wouldn't know but is it that annoying? What does it do to annoy you guys? Does it not switch back fast enough to 8 cyl mode?
You can feel the difference in the power and the car vibrates differently. Then when you put your foot into it you can feel the switch. It's a little annoying. I always go down a gear to turn it off. As soon as my car has no more warantees in about 6 years it's the first thing I'm going to disable.

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We did and it's so much better! It was driving us nuts. Besides, we didn't buy this car for the gas mileage.
Any more throttle response? Power off the line? Wheel spin?? Less lag? Tell us more! plz.
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Old 04-05-2010, 03:04 AM   #20
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I'm about to sell the car over this problem. I drive in manual all the time keeping the rpm's up so it doesn't shut down cylinders. I talked to the dealer about it and he said GM would have to initiate a fix before they could do anything. Anybody know what can be done. Thanks
Don't sell. Give it to me
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Old 04-05-2010, 03:10 AM   #21
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what do you guys mean by drone? like the sound of the exhaust? woudlnt u want to listen that? cuz i like listening to it when i drive.
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Old 04-05-2010, 09:53 AM   #22
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what do you guys mean by drone? like the sound of the exhaust? woudlnt u want to listen that? cuz i like listening to it when i drive.
I think they are talking about the lugging sound/resonance when it switches to 4 cyclinders. I can hear it and feel it even with the car 100% stock.
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Old 04-06-2010, 09:46 PM   #23
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What exactly does AFM stand for?
If I run American racing headers cats and x-pipe with my SLP power flo axel back will I have really bad drone with the "AFM" turned off?
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Old 04-06-2010, 10:03 PM   #24
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And from what I understand the drone is supposed to happen when AFM is on. Turning it off would get rid of the drone. I could be wrong though.
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Old 04-07-2010, 06:25 AM   #25
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I have the L99-A6 combo on my SS and have never heard the droan/vibration. I do want to install aftermarket exhaust but per my dealers service manager tuning out the AFM "will void the G.M. power train warranty". Personally I'm not doing it.
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