AFM actuators have failed again on track for my Z51
09-19-2016, 06:26 PM
#141
6th Gear
Member Since: May 2016
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By any chance, does anyone know if GM did anything differently in 2016 model year to improve this? I haven't tracked my 2016 C7 Z51 (planning early next year) yet and is already scared of this.
09-19-2016, 06:33 PM
#142
Pro
Here's the thread: https://www.corvetteforum.com/forums...post1593091310
09-20-2016, 02:00 PM
#143
Burning Brakes
Thread Starter
The solution GM has come up with for the AFM actuators is to delete them from any 2017 models intended for track, which means manual transmission cars Z51 and Grand Sport. The Z06's do not have AFM actuators for obvious reasons. They would have failed even faster than on the 2014-2016 Z51's. AFAIK there is no fix for any cars prior ro the 2017 models. The upgraded part was a muffler assembly with supposedly isolated AFM valves, but that upgrade did nothing on my car, and the AFM actuators are still the same as before, no changes as stated above. Only X25's solution of relocating the actuators is working from what I know.
10-03-2016, 11:31 PM
#144
Instructor
Member Since: Jan 2008
Location: Fort Walton beach Florida
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After four times having them replaced and dealing with GM customer Service. They have informed me that they have repaired the car as required under warranty so they have no problem. I was wanting something to cover after the warranty runs out but they will not provide anything or admit they have a problem. Looking at the lemon law requirements.
10-14-2016, 09:44 PM
#145
Pro
After four times having them replaced and dealing with GM customer Service. They have informed me that they have repaired the car as required under warranty so they have no problem. I was wanting something to cover after the warranty runs out but they will not provide anything or admit they have a problem. Looking at the lemon law requirements.
Hopefully when I discuss the Lemon Law with my dealer, they'll talk to the GM folks and extend my mufflers' warranty or include my mufflers under the powertrain warranty.
10-15-2016, 12:06 PM
#147
Pro
10-21-2016, 07:33 AM
#148
Just to give the corvette guys some hope, there is a solution being worked over on the camaro forums that should work just as well for the corvette guys. The intent is to build a plug in module will replicate the output the computer expects to see tricking it into thinking they valves are still in place. To be clear i have nothing to do with this but i trust in the forum members ability to accomplish it.
10-21-2016, 09:08 AM
#149
Pro
Just to give the corvette guys some hope, there is a solution being worked over on the camaro forums that should work just as well for the corvette guys. The intent is to build a plug in module will replicate the output the computer expects to see tricking it into thinking they valves are still in place. To be clear i have nothing to do with this but i trust in the forum members ability to accomplish it.
01-18-2017, 10:17 AM
#150
Burning Brakes
So, what did I miss? Seems all the threads for the plug and play AFM delete have been deleted!!!!! Did it not wind up working? Did GM put a ban on this? WTH happened?
01-18-2017, 11:53 AM
#151
Pro
I think the thread on the plug and play module were consolidated into this one in the sales section:
https://www.corvetteforum.com/forums...te-module.html
https://www.corvetteforum.com/forums...te-module.html
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AKKutz (01-18-2017)
01-29-2017, 10:46 AM
#152
Former Vendor
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St. Jude Donor '07-'08-'09-'10-'11-'12'-'13-'14-'15
Second time I have run my Z51 on track, and second time the AFM actuators have failed. 2 for 2. I got an engine check light, took it to the dealer, and he confirmed it was the same failure as last time I had it on track.
So, 2 track days, 2 failures of the AFM actuators. My car is 2014 C7 Z51 M7 with MRC, running in Track mode, PTM set to Sport 2. Less than 1.5 hours of track driving this time, and they actually failed halfway when I got the CEL.
So who else has had their actuators fail? Ron Fellows school manager told me last year they were having the same issue and that GM knew about it. Dealer checked and there is no new part number since the last ones they replaced.
Anyone know of a solution? Car checks the position/actuation of the actuator every start-up, regardless of what mode you are in. Dealer says mine are in the stuck open position, and until they get replaced, CEL will stay on. So just taking them out is not really an option.
So, 2 track days, 2 failures of the AFM actuators. My car is 2014 C7 Z51 M7 with MRC, running in Track mode, PTM set to Sport 2. Less than 1.5 hours of track driving this time, and they actually failed halfway when I got the CEL.
So who else has had their actuators fail? Ron Fellows school manager told me last year they were having the same issue and that GM knew about it. Dealer checked and there is no new part number since the last ones they replaced.
Anyone know of a solution? Car checks the position/actuation of the actuator every start-up, regardless of what mode you are in. Dealer says mine are in the stuck open position, and until they get replaced, CEL will stay on. So just taking them out is not really an option.
Just pick up a set of our AFM simulators, plug n play, and be done with issues, FOREVER
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04-30-2017, 10:25 AM
#153
Drifting
GM denied my warranty claim (ask me how I feel after being 'serviced' by Hendrick Chevrolet of Cary, NC. who uploaded my entire ECM data to GM without even asking).
Would like to clear the CEL.
04-30-2017, 10:31 AM
#154
Former Vendor
Member Since: Mar 2003
Location: Tampa FL
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St. Jude Donor '07-'08-'09-'10-'11-'12'-'13-'14-'15
Ready to ship- $149. Send email for invoice
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daleong (04-30-2017)
04-30-2017, 11:29 AM
#155
Instructor
God Bless you!
04-30-2017, 10:21 PM
#156
I have a theory about this. Maybe someone else has tried it.
Last year I did two HPDE track days. After the first one I got the check engine light for the AFM actuators.
I just completed a two day session. Before going out on the track I pulled fuse 42. My thought is that the actuators might not fail if they are not energized while exposed to the high heat. My driving education has improved so I'm running a *lot* harder than I did last year.
Two days does not make a scientific test, but at this point my AFM actuators are still working when the fuse is put back in (after cool down). Does anyone have experience with actuators failing when used this way?
Last year I did two HPDE track days. After the first one I got the check engine light for the AFM actuators.
I just completed a two day session. Before going out on the track I pulled fuse 42. My thought is that the actuators might not fail if they are not energized while exposed to the high heat. My driving education has improved so I'm running a *lot* harder than I did last year.
Two days does not make a scientific test, but at this point my AFM actuators are still working when the fuse is put back in (after cool down). Does anyone have experience with actuators failing when used this way?
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daleong (05-02-2017)
07-02-2017, 10:06 AM
#157
Intermediate
I bought a 2017 GS A8 in April. I went to the track a couple days ago and I had fuse 42 pulled.
On the way home I heard, what sounded like to me, a steam train like sound on/off only when in v4 mode. Now all I hear is a loud metalic clicking sound when switching between v4/v8.
The cel came on the next day with codes- P12FD P12F0 P26C8 P12F5 P12EB P12E9 P12E8 P12E7
I wish I had known about this problem, I would have bought an m7 as it has no AFM actuators.
On the way home I heard, what sounded like to me, a steam train like sound on/off only when in v4 mode. Now all I hear is a loud metalic clicking sound when switching between v4/v8.
The cel came on the next day with codes- P12FD P12F0 P26C8 P12F5 P12EB P12E9 P12E8 P12E7
I wish I had known about this problem, I would have bought an m7 as it has no AFM actuators.
I have a theory about this. Maybe someone else has tried it.
Last year I did two HPDE track days. After the first one I got the check engine light for the AFM actuators.
I just completed a two day session. Before going out on the track I pulled fuse 42. My thought is that the actuators might not fail if they are not energized while exposed to the high heat. My driving education has improved so I'm running a *lot* harder than I did last year.
Two days does not make a scientific test, but at this point my AFM actuators are still working when the fuse is put back in (after cool down). Does anyone have experience with actuators failing when used this way?
Last year I did two HPDE track days. After the first one I got the check engine light for the AFM actuators.
I just completed a two day session. Before going out on the track I pulled fuse 42. My thought is that the actuators might not fail if they are not energized while exposed to the high heat. My driving education has improved so I'm running a *lot* harder than I did last year.
Two days does not make a scientific test, but at this point my AFM actuators are still working when the fuse is put back in (after cool down). Does anyone have experience with actuators failing when used this way?
The following users liked this post:
daleong (07-02-2017)
07-06-2017, 11:31 PM
#158
Instructor
Yeah, sorry to say it Citation, but the valves on my '15 M7 Z51 failed when I was running with fuse 42 pulled.
I have a theory about this. Maybe someone else has tried it.
Last year I did two HPDE track days. After the first one I got the check engine light for the AFM actuators.
I just completed a two day session. Before going out on the track I pulled fuse 42. My thought is that the actuators might not fail if they are not energized while exposed to the high heat. My driving education has improved so I'm running a *lot* harder than I did last year.
Two days does not make a scientific test, but at this point my AFM actuators are still working when the fuse is put back in (after cool down). Does anyone have experience with actuators failing when used this way?
Last year I did two HPDE track days. After the first one I got the check engine light for the AFM actuators.
I just completed a two day session. Before going out on the track I pulled fuse 42. My thought is that the actuators might not fail if they are not energized while exposed to the high heat. My driving education has improved so I'm running a *lot* harder than I did last year.
Two days does not make a scientific test, but at this point my AFM actuators are still working when the fuse is put back in (after cool down). Does anyone have experience with actuators failing when used this way?
Last edited by Iceman09; 07-06-2017 at 11:32 PM.
07-07-2017, 08:12 AM
#159
Intermediate
Fuse 42 is for the actuators which are not the problem. The AFM actuators are on fuse 32.
Since my CEL is on and the actuators are making nasty noises on startup and while switching between v4/v8, I decided to pull 32 and see how it behaves.
All the noises went away and when it was in v4 mode I did not hear a difference. I'm going to drive it some more to test in v4 mode, it's supposed to sound really bad and I haven't experienced that yet.
I wonder if disabling the AFM actuators on track would help since they would not be moving while being too hot. Bad thing would be the CEL coming on when you pull that fuse. Also, I believe the valve is in the open position by default.
Since my CEL is on and the actuators are making nasty noises on startup and while switching between v4/v8, I decided to pull 32 and see how it behaves.
All the noises went away and when it was in v4 mode I did not hear a difference. I'm going to drive it some more to test in v4 mode, it's supposed to sound really bad and I haven't experienced that yet.
I wonder if disabling the AFM actuators on track would help since they would not be moving while being too hot. Bad thing would be the CEL coming on when you pull that fuse. Also, I believe the valve is in the open position by default.
07-07-2017, 12:22 PM
#160
Burning Brakes
I have the same AFM failure problem. Would love to go this direction and just forget about it. Does anyone know whether failing to replace the failed AFM's would cause a problem passing smog testing?
