View Poll Results: Change all lifters or just the bank 1 lifters
Multiple Choice Poll. Voters: 38. You may not vote on this poll
Lifters
Drifting
Joined: Mar 2021
Posts: 1,432
Likes: 925
From: Bristow, VA
2023 C8 of the Year Finalist - Modified
Hard to say without doing FA to determine root cause of the failure. If the operating hours have exceeded the infant mortality phase of the failure (bathtub) curve then it could be argued that the remaining lifters would be less likely to fail than a new set.
Thread Starter
Intermediate
Joined: Feb 2022
Posts: 26
Likes: 3
Last edited by My2022C8; Mar 24, 2022 at 09:57 PM.
Drifting
Joined: Mar 2021
Posts: 1,432
Likes: 925
From: Bristow, VA
2023 C8 of the Year Finalist - Modified
Hard to say if that was a symptom of #5 leading up to the ultimate failure. I imagine you’re worried about putting it back together just to find out there is still a problem….Valid concern but I think you have to address the known failure first unless you have a reason to suspect other components, like FA results which would implicate a lot/batch of common components.
Instructor
Joined: Nov 2020
Posts: 168
Likes: 90
I would be surprised if you actually have a choice as to how many lifters are changed out. Chevrolet, more than likely, will only cover the damaged lifter. As has been mentioned, they are not built in sets so possibly no need to change them, however, lifter 5 is one of the four cyclinders that are deactiveated during AFM operation. I wonder if the AFM operation had anything to do with your failure. Perhaps you could lobby for them to at least change out the lifters in cyclinders 2, 3, 5 & 8, which are subject to AFM shutdown, as a precaution. I doubt they will go for that but at least there is a colorable argument there for the replacement as opposed to the replacement of all or even an entire bank. I always use Z Mode and never, other than for one brief experimental time period, allow AFM to be activated in my car. I realize it is seamless, other than a slight hiss when it shifts in, but I just don't trust it and I like the car much more in Z Mode anyway so I don't feel like I'm missing anything by not utilizing AFM. The nominal fuel savings doesn't mean a lot to me. I had a ton of problems with it in a Chevy truck years ago. One bitten, twice shy!
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Intermediate
Joined: Feb 2022
Posts: 26
Likes: 3
Last edited by My2022C8; Mar 24, 2022 at 09:56 PM.
Race Director
Joined: Aug 2016
Posts: 12,763
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From: Garden Valley CA
do you think it’s normal for the rpm to drop when idol at 1k and hesitate when the car is idol it seems to be an issue I have several friends and none of there C8’s have this issue the tech said it’s normal but if it was why then I don’t see it on any threads and the guys I ride with none have this issue just seems to be something wrong I do know that they C8 can idol at 500 but I don’t know if anyone that say it idols at 1,000 then drops to 9 8 or 700 and comes back up to 1000 creating a distinct hesitation and vibration - would you think that is normal or should I keep searching for a resolution
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Race Director
Joined: Aug 2019
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From: Central Illinois
do you think it’s normal for the rpm to drop when idol at 1k and hesitate when the car is idle it seems to be an issue I have several friends and none of there C8’s have this issue the tech said it’s normal but if it was why then I don’t see it on any threads and the guys I ride with none have this issue just seems to be something wrong I do know that they C8 can idol at 500 but I don’t know if anyone that say it idols at 1,000 then drops to 9 8 or 700 and comes back up to 1000 creating a distinct hesitation and vibration - would you think that is normal or should I keep searching for a resolution
Thread Starter
Intermediate
Joined: Feb 2022
Posts: 26
Likes: 3
I didn't say that at all and you're assuming I did. What I said was, and is accurate, is a healthy LT2 idles while stopped at well below 1,000 rpm (steady at around 650 rpm). It shouldn't fluctuate all over and it certainly shouldn't hesitate. If your idle speeding is going up and down and there is vibration and hesitation something is clearly wrong.
Instructor
Joined: Nov 2020
Posts: 168
Likes: 90
It would be interesting to ask them why they belive the lifter failed and whether the failure was related in amy way to the mechanism that shuts the lifter down when the AFM kicks in. Please let us know what you find out. Good luck!!
Cruising
Joined: Apr 2021
Posts: 13
Likes: 6
I had a lifter failure in my 2021 C8 just before reaching 2000 miles. GM replaced all the lifters in Bank 1 under warranty (and the coil packs). I'm now at 9000 miles with no additional problems . . . fingers crossed. For what its worth, the technical service bulletin related to my repair (19-NA-218) appeared to recommend replacing all the lifters in the bank with the failed lifter.
Last edited by Redmist.2021.C8; Mar 25, 2022 at 12:25 PM. Reason: additional information
Thread Starter
Intermediate
Joined: Feb 2022
Posts: 26
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Hesitation
So I hit my 2022 C8 back today so far pretty good we changed all the lifters in Bank 1 and the hesitation from V4 to V8 is gone and there is no hesitation when idle looks good feels good 😎
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Good outcome so far. Hope it stays that way and you get to enjoy your C8.
