AFM lifter failure. Common?
Thread Starter
Le Mans Master
Joined: Mar 2016
Posts: 9,131
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From: 2019 CMG Z06
AFM lifter failure. Common?
Cylinder bank 7 AFM lifters have failed. The dealer engine guy is vette certified, and has been with them for 20+ years. So I’m not worried about his work, extremely knowledgeable guy, but I am wondering if this is a known issue or just a fluke. His recommendation is to replace all of the lifters on that side and also the fuel pump as he believes it is not functioning properly. Thanks to the strike though, we need to wait for parts.
Tech Contributor
Joined: Oct 1999
Posts: 41,013
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From: Charlotte, NC (formerly Endicott, NY)
If the mechanic is familiar with GM V8 engines it really doesn't matter whether he is Vette certified or not. As for AFM lifter issues I believe they are generally a thing of the past. The early AFM truck engines had AFM lifter issues that are pretty well discussed on various forums but the newer Gen 5 engines (like in the C7) seem to be generally free of issues.
Bill
Bill
Thread Starter
Le Mans Master
Joined: Mar 2016
Posts: 9,131
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From: 2019 CMG Z06
Thanks guys. I’m really not that worried about the job itself, the guy’s great at what he does. Now I’m wondering if anything I did lead to this. I doubt it, as I remember friends with previous gen Tahoes and trucks with these issues.
Melting Slicks
Joined: Jul 2018
Posts: 2,758
Likes: 668
From: Fort Wayne, IN
Cylinder bank 7 AFM lifters have failed. The dealer engine guy is vette certified, and has been with them for 20+ years. So I’m not worried about his work, extremely knowledgeable guy, but I am wondering if this is a known issue or just a fluke. His recommendation is to replace all of the lifters on that side and also the fuel pump as he believes it is not functioning properly. Thanks to the strike though, we need to wait for parts.
@KenHorse had a failure as well, but I don't know if it was the same issue.
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Team Owner
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From: I live my life by 2 rules. 1) Never share everything you know. 2)
St. Jude Donor '11-'12-'13, '16-'17-'18
Yes, and we are not alone! I believe it's the same #7 for most of the cases
@KenHorse had a failure as well, but I don't know if it was the same issue.
https://www.youtube.com/watch?v=_sCcfqFAUc8
@KenHorse had a failure as well, but I don't know if it was the same issue.
https://www.youtube.com/watch?v=_sCcfqFAUc8
https://www.corvetteforum.com/forums...engine+failure
Thread Starter
Le Mans Master
Joined: Mar 2016
Posts: 9,131
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From: 2019 CMG Z06
Thanks for the link Ken. Your receipt seemed to indeed indicate #7. Can't wait until they get the damn parts. Although, in the meantime, they gave me a new 3.6 Blazer off the lot. Holy crap, this thing is unexpectedly quick
Team Owner
Joined: Aug 2007
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From: I live my life by 2 rules. 1) Never share everything you know. 2)
St. Jude Donor '11-'12-'13, '16-'17-'18
Now I know cyl's 1, 3, 5 and 7 are front to rear on driver's side and 2, 4, 6 and 8 are on the passenger side. I've been told that cyl's 3, 4, 5 and 6 are the AFM ones. So a non AFM lifter failed????????????
Last edited by KenHorse; Oct 1, 2019 at 08:48 PM.
Thread Starter
Le Mans Master
Joined: Mar 2016
Posts: 9,131
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From: 2019 CMG Z06
It shows lifter #7 not cylinder #7. I haven't looked at for a while.
Now I know cyl's 1, 3, 5 and 7 are front to rear on driver's side and 2, 4, 6 and 8 are on the passenger side but I wonder how valves (and lifters) are numbered. I've been told that cyl's 3, 4, 5 and 6 are the AFM ones
Now I know cyl's 1, 3, 5 and 7 are front to rear on driver's side and 2, 4, 6 and 8 are on the passenger side but I wonder how valves (and lifters) are numbered. I've been told that cyl's 3, 4, 5 and 6 are the AFM ones
Team Owner
Joined: Aug 2007
Posts: 136,140
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From: I live my life by 2 rules. 1) Never share everything you know. 2)
St. Jude Donor '11-'12-'13, '16-'17-'18
Quite happy. No further issues since (8800 miles on the clock now)
Scientific Negotiator
Joined: Jul 2005
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From: USA
St. Jude Donor '07-'08-'10, '14
While it may be a little more common sounding here, it's not very common to see this. We tend to see far more people post once an issue comes up vs not at all if their cars runs perfect.
Ken is an obvious unfortunate exception since he's a huge contributor here, but all the same. Playing it safe and never going into eco on my M7 tho!
Ken is an obvious unfortunate exception since he's a huge contributor here, but all the same. Playing it safe and never going into eco on my M7 tho!
Thread Starter
Le Mans Master
Joined: Mar 2016
Posts: 9,131
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From: 2019 CMG Z06
As far as your confusion Ken, I’m no expert, not sure which cylinders are AFM, but I can tell you my service guy told me AFM lifters on 7. I’ll be talking to the engine guy again in a day or two. I can confirm. I find it ironic that yours was 7 too. Sounds like Hoosiers was too.
Thread Starter
Le Mans Master
Joined: Mar 2016
Posts: 9,131
Likes: 3,975
From: 2019 CMG Z06
While it may be a little more common sounding here, it's not very common to see this. We tend to see far more people post once an issue comes up vs not at all if their cars runs perfect.
Ken is an obvious unfortunate exception since he's a huge contributor here, but all the same. Playing it safe and never going into eco on my M7 tho!
Ken is an obvious unfortunate exception since he's a huge contributor here, but all the same. Playing it safe and never going into eco on my M7 tho!
Melting Slicks
Joined: Jul 2018
Posts: 2,758
Likes: 668
From: Fort Wayne, IN
As far as your confusion Ken, I’m no expert, not sure which cylinders are AFM, but I can tell you my service guy told me AFM lifters on 7. I’ll be talking to the engine guy again in a day or two. I can confirm. I find it ironic that yours was 7 too. Sounds like Hoosiers was too.
For me the dealer was great to work with and the car ran perfectly after the rebuild... but more importantly it actually ran and pulled better than before the failure
Good luck with your car, I'm sure they'll get you back up and running. Timing sucks for the end of the year though!
Last edited by HooosierDaddy; Oct 1, 2019 at 10:21 PM.
Advanced
Joined: May 2015
Posts: 91
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From: Wyoming
As far as your confusion Ken, I’m no expert, not sure which cylinders are AFM, but I can tell you my service guy told me AFM lifters on 7. I’ll be talking to the engine guy again in a day or two. I can confirm. I find it ironic that yours was 7 too. Sounds like Hoosiers was too.
The LT1’s Active Fuel Management (AFM) system uses ECM-controlled deactivation lifters to shut off cylinders 1, 7, 6, and 4, creating a virtual V-4 with an 8-2-5-3 firing order.
Dennis
Le Mans Master
Joined: Feb 2002
Posts: 5,394
Likes: 281
From: cumming ga
My 16 Z06 had 13444 miles when my DOD lifter failed scratched cam new lifters and cam pays over 3o hours six weeks to get my car back.
z51vett
Doug
z51vett
Doug
Last edited by z51vett; Oct 1, 2019 at 11:03 PM.
