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Old 02-10-2011, 06:23 PM   #1
ebaugh1990
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Any L99 owners having problems with DoD?

I was looking at some problems with Active Fuel management(DoD) on the L99 and other V8 engines. I found this article.

http://townhall-talk.edmunds.com/direct/view/.f1648c7

I was wondering if any L99 owners out there have had any issues with lifters, as I was thinking about going with the A6 rather than the M6. If I were to go with an A6 I'm most likely going to buy a DiabloSport tuner with it and turn the DoD off.


Also, If i buy one it will be a 2011 model, just in case it matters.
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I agree, my car without cats doesn't smell like rotten eggs, it smells like high octane Bad@ssness emitted through a natural speaker producing "Muscle Car Music"

Last edited by ebaugh1990; 02-10-2011 at 06:33 PM.
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Old 02-10-2011, 06:35 PM   #2
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We had several members with a lifter issue. There's a TSB out for it. But the majority of the L99s aren't having the issue.

Here's a thread about the issue.

http://www.camaro5.com/forums/showth...tapping+lifter

But I wouldn't let this stop you from getting an L99 A6.
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Old 02-10-2011, 06:49 PM   #3
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Quote:
Originally Posted by SGOS252382 View Post
We had several members with a lifter issue. There's a TSB out for it. But the majority of the L99s aren't having the issue.

Here's a thread about the issue.

http://www.camaro5.com/forums/showth...tapping+lifter

But I wouldn't let this stop you from getting an L99 A6.
Thanks man. I was hoping by now GM(and Mopar) would realize that the whole fuel saver stuff like DoD and MDS doesn't need to be used in Muscle Car applications. I can understand say a chrysler 300 with the HEMI or a Silverado with the 5.3 using DoD/AFM/MDS but not a Muscle Car. Leave the Fuel Saver stuff to the vehicles like mini vans or something. I believe Muscle Cars(Camaro, Mustang, and Challenger) should run on all 8 Cylinders. It's a V8 for a reason!

That's my rant anyway, and those of you who enjoy using the DoD/AFM to get a few extra MPG's then that's great. I'm not trying to say anything bad about it, but you think after all the lifter issues GM would just cut it out ya know.

Anyone else have any input, all is welcome.
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I agree, my car without cats doesn't smell like rotten eggs, it smells like high octane Bad@ssness emitted through a natural speaker producing "Muscle Car Music"
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Old 02-10-2011, 06:56 PM   #4
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LOL, i tough you meant DoD (Department of Defense)
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Old 02-10-2011, 07:00 PM   #5
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Originally Posted by christianmotox View Post
LOL, i tough you meant DoD (Department of Defense)
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Old 02-10-2011, 07:02 PM   #6
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I have had some lifter tap, but unable to get it rectified thru the dealer (lazy techs keep passing it off as normal)

BUT I will say that aside from this, and the DOD (which I will soon be tuning out) I love this motor. The torque and hp are unlike anything I've driven prior
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Old 02-10-2011, 07:05 PM   #7
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Quote:
Originally Posted by Revo1 View Post
I have had some lifter tap, but unable to get it rectified thru the dealer (lazy techs keep passing it off as normal)

BUT I will say that aside from this, and the DOD (which I will soon be tuning out) I love this motor. The torque and hp are unlike anything I've driven prior
Yeah, I'd be going with a diablosport. It can just turn off the DoD. A lot cheaper than a L99 to LS3 conversion.
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I agree, my car without cats doesn't smell like rotten eggs, it smells like high octane Bad@ssness emitted through a natural speaker producing "Muscle Car Music"
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Old 02-10-2011, 07:54 PM   #8
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I think GM calls is AFM, Active Fuel Management. Chrysler may use DoD.

Not a big fan, but to avoid the Guzzler Tax, it's a must.

But even not being a fan, I wouldn't give up my powertrain warranty to recalibrate the car to eliminate it.
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Old 02-10-2011, 07:59 PM   #9
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I believe MOPAR calls it MDS - Multiple Displacement System.
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Old 02-10-2011, 08:01 PM   #10
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No problems here.

I, for one, wanted the L99 partially because of the AFM. Doing my (very small) part for the environment....one of the tools in bringing performance cars into the 21st century IMO. I think it's great to save a little fuel when cruising on the highway, plus when you jam on it, it's still a rocket...switches over faster than I could gear down in the M6 anyway.
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Old 02-10-2011, 08:03 PM   #11
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My lifters tapped from 300 miles on. I waited it out and got worse. I finally had the new ones installed last week and it's a world of difference. No lifter tapping at all.
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Old 02-10-2011, 08:06 PM   #12
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Quote:
Originally Posted by ebaugh1990 View Post
Yeah, I'd be going with a diablosport. It can just turn off the DoD. A lot cheaper than a L99 to LS3 conversion.
Quote:
Originally Posted by Number 3 View Post
I think GM calls is AFM, Active Fuel Management. Chrysler may use DoD.

Not a big fan, but to avoid the Guzzler Tax, it's a must.

But even not being a fan, I wouldn't give up my powertrain warranty to recalibrate the car to eliminate it.
Number 3 is right... no reason to blow your warranty just to turn off AFM otherwise know as DOD Displacement on Demand.

But if you don't care about warranty don't go with Diablo... get an SCT instead. Diablo doesn't have a tune for the A6 transmission.


Bottom line is you shouldn't have any problem with the lifters... and turning off DOD doesn't change the fact that the lifters are still there.
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Old 02-10-2011, 08:25 PM   #13
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Quote:
Originally Posted by mlee View Post
Number 3 is right... no reason to blow your warranty just to turn off AFM otherwise know as DOD Displacement on Demand.

But if you don't care about warranty don't go with Diablo... get an SCT instead. Diablo doesn't have a tune for the A6 transmission.


Bottom line is you shouldn't have any problem with the lifters... and turning off DOD doesn't change the fact that the lifters are still there.
Def. getting the SCT tune then.

Doesn't the AFM/DOD cause the exhaust to sound really weird if you have an after-market exhaust?

Im trying to find a programmer for my impala LT but no luck so far.
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http://www.youtube.com/watch?v=9o-6g...ujjgV9wZo9jnXw

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I agree, my car without cats doesn't smell like rotten eggs, it smells like high octane Bad@ssness emitted through a natural speaker producing "Muscle Car Music"
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Old 02-10-2011, 08:29 PM   #14
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Yeah, I'd be going with a diablosport. It can just turn off the DoD. A lot cheaper than a L99 to LS3 conversion.
Careful with that....... DEFINITELY don't go 2nd hand like I did. I ended up with 3 codes and still have the damned AFM. (DOD, GM stlye)

If you do buy Diablo, go NEW, and definitely update it before you plug it in. And don't expect any help from the hotline if you get in trouble.

If you're gonna do handheld, I'd recommend SCT- heard alot of good things about them.
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Old 02-10-2011, 08:30 PM   #15
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Quote:
Originally Posted by Revo1 View Post
Careful with that....... DEFINITELY don't go 2nd hand like I did. I ended up with 3 codes and still have the damned AFM. (DOD, GM stlye)

If you do buy Diablo, go NEW, and definitely update it before you plug it in. And don't expect any help from the hotline if you get in trouble.

If you're gonna do handheld, I'd recommend SCT- heard alot of good things about them.
Does the SCT allow DoD to be turned off?
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Cold Air Inductions intake (near-chrome)

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I agree, my car without cats doesn't smell like rotten eggs, it smells like high octane Bad@ssness emitted through a natural speaker producing "Muscle Car Music"
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Old 02-10-2011, 08:33 PM   #16
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My exhaust sounds like this when the AFM kicks in.



Normally it sounds like this.

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Old 02-10-2011, 08:38 PM   #17
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sounds sick man
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Old 02-10-2011, 08:48 PM   #18
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no tap with mine. had the afm tuned out too.
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Old 02-10-2011, 08:50 PM   #19
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LOL, i tough you meant DoD (Department of Defense)
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Old 02-10-2011, 09:06 PM   #20
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Does the SCT allow DoD to be turned off?
Sure does. Ss I understand it, the SCT allows the user to apply a more specific/thorough tune than the Diablo.
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Old 02-10-2011, 09:26 PM   #21
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I don't own a Camaro, but I had a G8 GT with the AFM and never had an issue. I'm not sure how similar the setups are...but, I hope this helps.
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Old 02-10-2011, 09:29 PM   #22
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I wonder if you have a problem with AFM lifters you can choose to replace them under warranty at the dealer with non AFM lifters?
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Old 02-10-2011, 09:45 PM   #23
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I wonder if you have a problem with AFM lifters you can choose to replace them under warranty at the dealer with non AFM lifters?
Not a chance...

Quote:
Originally Posted by Revo1 View Post
Sure does. Ss I understand it, the SCT allows the user to apply a more specific/thorough tune than the Diablo.
Not really... Both SCT and Diablo do great engine tunes (ECM)... but only SCT does the Transmission (TCM) tune. And with the Autos this is the BEST part of the tune. With either of these a tuner like Ted Jannetty can buld you a custom tune w/ all the bells and whistles.

Quote:
Originally Posted by y2k king View Post
no tap with mine. had the afm tuned out too.
Tuning out AFM doesn't have any affect on the lifter tap... you either have it or you don't

Quote:
Originally Posted by ebaugh1990 View Post
Def. getting the SCT tune then.

Doesn't the AFM/DOD cause the exhaust to sound really weird if you have an after-market exhaust?

Im trying to find a programmer for my impala LT but no luck so far.
When it switches into 4 cylinder mode you sort of hear a groan noise. You will notice it even with stock exhaust. Then when you add Catback it will be a little more prevelant... now add LT headers and it will drive you nuts, but at that point you are tuning and not worried about warranty anyway.

I used to have mine active in 5th and 6th gear only in Drive and totally off in Sport mode. With any handheld tuner you can turn it all off or all on... but your hometown tuner guy w/ EFI Live or HP Tuners can set each gear independent in both D and S.
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Old 02-02-2012, 03:47 AM   #24
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Have a 2010 6.2 SS2. i disabled the DOD/AFM with a diablo tuner. No more annoying rumble and much more responsive.
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Old 02-02-2012, 04:34 AM   #25
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i had a silverado with the afm and it had lifter problems bad!! thats y there was no chance of me going with the a6. The truck only had 50k miles and been in the shop for warranty on the lifters 6 times. Im done with that crap!
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