C7 Z06 Problem
Thread Starter
Intermediate
Joined: Apr 2019
Posts: 47
Likes: 4
From: Texas
C7 Z06 Problem
Good evening. I’ve got a 19 Z06 with the A8. I bought the car new 3 years ago. The car has right over 3600 miles on it. It’s never been tracked but has been driven somewhat hard a few times. I got home this evening and while it was idling in the garage it sounded like the engine had a knock at first but upon further listening it sounds like it also has a rattle coming from about maybe the middle of the car or closer to the engine. Any help would be appreciated
Safety Car
Joined: Apr 2008
Posts: 4,833
Likes: 1,850
From: NJ
2025 C8 of the Year Finalist - Modified
2023 C8 of the Year Finalist - Unmodified
2022 C7 of the Year Finalist - Modified
2021 C7 of the Year Finalist - Unmodified
Heat shield of some sort? I know that rattle all too well on other cars from the past. Hope it's something simple like that.
Melting Slicks
Joined: Aug 2004
Posts: 2,339
Likes: 483
Check the basics. Hard to tell too much from the video but check that you exhaust manifold is tight and that the plugs and wires are tight. If they are you may need to remove the valve covers and check valve springs, push rods, or see if a lifter seems collapsed.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Intermediate
Joined: Apr 2019
Posts: 47
Likes: 4
From: Texas
I took it for a drive earlier and the car has definitely lost power. It isn’t as “peppy” and now I can hear what sounds like an exhaust manifold leak. I’ve had another vehicle that had a manifold leak and this is definitely what it sounds like. It’s going to my local dealer Monday since I still have warranty left.
If it is a valve train issue does anybody have experience on what the dealership could possibly do? Ex. replace all the lifters and added a warranty for the replacements?
If it is a valve train issue does anybody have experience on what the dealership could possibly do? Ex. replace all the lifters and added a warranty for the replacements?
Team Owner
Joined: Feb 2000
Posts: 45,388
Likes: 892
From: Texas
CI 1-4-5-8-9-10 Vet
St. Jude Donor '03 thru '10, '17
Some of our engines can have an AFM lifter take a dump. I believe there’s even a high incidence of a lifter failure for a certain cylinder (is it 5 or 7?) If that’s the case, it will be covered under warranty. I do hope it’s something minor. That does sound like a lifter.
Team Owner
Joined: Feb 2000
Posts: 45,388
Likes: 892
From: Texas
CI 1-4-5-8-9-10 Vet
St. Jude Donor '03 thru '10, '17
Regarding a local dealer who is trusted - try posting in this section:
https://www.corvetteforum.com/forums/southwest-44/
https://www.corvetteforum.com/forums/southwest-44/
Thread Starter
Intermediate
Joined: Apr 2019
Posts: 47
Likes: 4
From: Texas
Some of our engines can have an AFM lifter take a dump. I believe there’s even a high incidence of a lifter failure for a certain cylinder (is it 5 or 7?) If that’s the case, it will be covered under warranty. I do hope it’s something minor. That does sound like a lifter.
Race Director
Joined: Mar 2003
Posts: 10,789
Likes: 894
From: Northern Illinois
Oldtimer
I had a partially collapsed lifter on my '19 Z06 at about the same mileage. My car never lost any noticeable power. GM replaced all of the lifters under warranty. Fortunately, there was no other damage as a result. Car ran great after they repaired it.
Race Director
Joined: Mar 2003
Posts: 10,789
Likes: 894
From: Northern Illinois
Oldtimer
Thread Starter
Intermediate
Joined: Apr 2019
Posts: 47
Likes: 4
From: Texas
What kind of warranty did they give you on the parts? Did they replace just that collapsed lifter or all of them?
Safety Car
Joined: Mar 2004
Posts: 4,048
Likes: 1,476
From: South Florida
As long as the car isn't driven much with the collapsed lifter, replacing the lifter is adequate and shouldn't cause any longer term issues. However, driving the car for a thousand miles without repair, will eventually damage the cam lobes surface and send metal through the engine which could then manifest itself 10's of thousands of miles down the road by eating up the bearings. It's also possible you broke a spring or a rocker arm which would explain the power loss. This could wash the cylinder down with fuel if an air charge isn't getting in. Depends on if its an intake or exhaust valve.
Have the lifter replaced, if they replace them all, great, if not, don't stress. But DEFINITELY change the oil and filter as well at the same time you replace the lifter.
Have the lifter replaced, if they replace them all, great, if not, don't stress. But DEFINITELY change the oil and filter as well at the same time you replace the lifter.