lifter faikure
Thread Starter
Pro
Joined: Mar 2021
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lifter faikure
Has anyone with a manual C7 experienced the dreaded lifter failure, being a manual you would stay in v8 mode all the time unless you went to eco mode which I doubt anyone does. I have been thinking about doing the delete kit if it is still an issue.
Racer
Joined: Jul 2015
Posts: 492
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From: Maryland
I think you’ll find through enough research that failures are all over the board. Some say the failures mostly happen to cars where AFM is rarely exercised and then used for whatever reason. It’s all hit or miss. I think the overall number of failures is still small to total vehicles sold but if course most failures make their way to the forum whereas all the the others you never hear about. I honestly wouldn’t let the failure stand in your way of owning such an amazing vehicle. If you’re into modding anyway, do a DOD delete cam package and get more power and resolve the issue for probably cheaper then having GM replace your lifters with more AFM lifters.
Thread Starter
Pro
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Thanks for the response, I do have a 2019 Grand sport which I bought new and I do really enjoy the car. With the warranty expiring soon I am thinking about doing the delete and cam option. I personally am not looking for a lot more power as I find the 460hp enough but I figure while doing he lifter job to put in a cam and bump it up a little. If I was confident that the lifters would not be a future problem I would not do it.
Last edited by Vetteman Jack; Nov 18, 2024 at 06:51 PM.
Racer
Joined: Jul 2015
Posts: 492
Likes: 125
From: Maryland
If you aren’t after power, then just ride it out unless you just can’t sleep knowing your lifters are still AFM. Odds say you won’t have an issue.
I’m not worried about it but I want a heads/cam car so I’m going to do the DOD delete just because I’m in there.
I’m not worried about it but I want a heads/cam car so I’m going to do the DOD delete just because I’m in there.
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Hopefully you never have a problem with the AFM system - I would bet the majority of C7s have not had any problems.
Otherwise, if the fear of AFM failure really concerns you, do the delete with a new cam and lifters and enjoy the car.
Otherwise, if the fear of AFM failure really concerns you, do the delete with a new cam and lifters and enjoy the car.
Le Mans Master
Joined: Jun 2019
Posts: 5,474
Likes: 2,181
From: Loveland
I just did the VLOM mod. No more 4 cylinder mode. No more worries about the failure. Total cost about $100 bucks.
https://www.crazedperformancerepair....vette-vlom-mod
https://www.crazedperformancerepair....vette-vlom-mod
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Racer
Joined: Jul 2015
Posts: 492
Likes: 125
From: Maryland
keyword being helps. It doesn’t really do anything more than the range. It prevents the ECU from calling for V4 and doesn’t allow oil pressure to hit the solenoids. You still have collapsible lifters that could drop. Will they? No idea, but people on Range devices have failures too.
Racer
Joined: Jul 2015
Posts: 492
Likes: 125
From: Maryland
Yes but it doesn’t actually remove the collapsible lifters. Until you do that, they could collapse. Are you decreasing the chance, maybe.. but I believe there have been failures on cars that have never or haven’t in a long time activated AFM.
Le Mans Master
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From: 2019 CMG Z06/ZR1
OP, I had a 16 M7. Mine from day 1, picked it up with 3 miles. The car was NEVER in eco mode, yet at 7,100 miles, bank 7 failed.
Team Owner
Joined: Jul 2004
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From: Hartford WI
You still have the sketchy lifters so I don't see any way to fix it besides removing that weak point. Has any documented research been done on it to show it improves your chances by X% or is it just a "based on a theory, it will....."?
Thread Starter
Pro
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That is what I wanted to know, thank you. Looks like I will be doing the cam swap and lifter delete.
Team Owner
Joined: Jul 2004
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From: Hartford WI
Can you cite the research you did so we know exactly what you saw as opposed to wading through 5000 articles to see the point you are trying to make? I'm trying to see how the oil pressure and flow change will help if the lifter is just a poor design. I agree that it is cheap and easy but I hate to do something half assed because it is cheap and easy with the attitude of "What have you got to lose?" as a first resort.
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Melting Slicks
Joined: Aug 2018
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From: Clermont, Florida
I bought the car new and never had it in ECO Mode. Since it was a GM factory warranty repair it had to be factory parts. Traded car in about ten months after for a C8.