the tick was the only symptoms I had when I brought it in before when they found the damage. Same symptom likely means same problem. Sorry i put an S on cam. I hope you are ok. But they replaced 2 sooo...

 

If it's had the cam replaced twice, then the engine has been out twice, that car would be down for weeks at a time for parts alone. Plus the head work and lifters. With that much internal damage, it makes no sense that there were no codes thrown or anything other than a tick. That motor is junk with that much damage, a cam isn't made out of hardened marshmallow cream.

 

one repair. I'll take a pic of the ordrr

Edit: iirc the first one they got might have been damaged.

 

That would help. Also, what exactly were the mod(s)? I see Haltech intake, and mention of MAF. Does that mean Mass Airflow Sensor? Was that replaced or reused? Was an adapter harness needed. I don't see an aftermarket MAF sensor on the Haltech Systems website, but I see adapters - but not specific to C8. I do see a GM MAF sensor on that website.

When were the mod(s) installed? I see the tick was on day 1, and it took three months to repair. Was it in the shop the whole time? Then it ticked again the next day. Was it ever fixed? Was the original tick before the mods were installed?

 

they said it was the MAF(Mass Air Flow) not fitting in my Haltech that is causing the tick. It's a stock MAF and it fits just like factory. There is no adapter of any sort.

in fact, iirc the Haltech causes the least number of timing corrections done by the ECU of any possible option. So if anything it works better.

 

something tells me this guy was lied to to get him out of the shop, how long was the car at the dealer for for this service? this is weeks of work, most dealers would have replaced the engine if there was bad valves and damage to the cam sending metal throughout the whole engine like that. i haven't heard of a ton of lifter issues with these so maybe you're just the lucky one!

 

they had it for 3 months the first time. We're going on 3 weeks now.

 

Looks like I'm not alone.
https://www.corvetteforum.com/forums...y-2020-c8.html

 

If you're counting on that video with his typical sensationalism to generate clicks, you're kidding yourself. His video even lists the cars that are included in the lawsuit and the C8 ISN'T in it. His logic is, well it has AFM lifters and so did a 2006 5.3, so it's all the same. If AFM systems were failing in the C8, there would be dozens of threads about it on here and there aren't. He is famous for BS videos, like the one that said his C8 wouldn't run. He hopes everyone will chicken little and click on the video to see if they have a problem too. If he was honest, the title would have been, I had to replace a dead battery. Problem is, it would have had zero views. Did you find your job ticket for what work was performed on your car? Please take a pic and post it.

 

I think i left it in my glovebox and I'm traveling for work the rest of the week. Hopefully I'll be able to stop by the dealer Friday or Saturday.

 

Picked it up today. Their story now is that all C8s sound like this and this noise is the injectors. So my question was, if that was the case why didn't anyone dismiss it and say that was the problem the first time they replaced the cam, lifters etc? Did I just get lucky and talk them into doing it? Of course they only had 1 C8 that they would let me hear and that was in the used car showroom. They did not sound the same. Here is the pic of the service receipt from the first attempt.

 

OK - your invoice, which appears to be for the first issue - the first time you took it in - is pretty clear. There was an actual issue with lifters and the camshaft. This is evident because of 1) the noise and check engine light you reported, 2) #4 spark plug was fouled, 3) the compression was low on #4 cylinder, 4) once disassembled, the found that #4 intake valve cam on the camshaft was damaged. So - lifter 4 failed. Of interest to some, the Cylinder Deactivation (AFM) lifters are for #2,3,5, and 8 on the LT2 engine. So this lifter was NOT one of the AFM lifters.

The remedy was to replace all the lifter (NOT JUST "ONE SIDE") and it looks like all of the lifter guides. Given that the cam was damaged, it would seem that some metal would have been shed into the engine oil. As a minimum they should have changed the engine oil and engine oil filter. Did they? I am sure many think that with cam damage, the engine should be replaced. For a repair this large and expensive, I think you can be sure GM was contacted about this warranty repair. So it was likely GMs decision not to replace the engine, and not a dealer decision. You can ask you dealer about that.

Sounds like the dealer is now saying that the noise you now hear is the injector noise. And, since, on the previous repair, they found fouled plug, low compression, and a damaged cam, that is the reason they did not dismiss it - you did not talk them into it - the test results led them to the repairs that they made.

 

thanks for the reply. According to the invoice yes, it looks like they changed the oil. If the noise is there and even louder after hard acceleration and coasting then how could it be the injectors? If they were pumping while coasting it would be shooting flames out the back.

Does everybody's car sound like this and I've just never heard anyone else complain about it? Crank it up, instant loud ticking. Driving around, ticking. Accelerate and coast, super loud BMX with a card in the spokes. Why would GM have this when hundreds or other high performance cars not sound like this garbage?

 

I do not know what you are hearing. I have an HTC and have never heard the injector noise. Others have and say its kinda loud (to some) ... but has a sewing machine sort of sound. But the first time, the dealer did compare the sound to another C8 and determined that you noise was abnormal. What did they do this time to decide it was normal? You will need to find out more detail about the diagnosis for the more recent issue, and their basis for saying its normal. Did they run any tests other than just listening to the noise? Did they, for example, run another compression check etc. The scan tools can detect misfire. And thats easy to check. There's no advantage that I know of for the dealer to deny a problem is there is one - they may think that what the are telling you is accurate.

 

the funny thing is i had brought it in for oil changes 3 or 4 times complaining about the ticking and every time until last December they denied hearing anything. It has been making this exact sound the entire time I've had it.
This time they said they compared it to other cars and didn't hear anything different. i dont know what cars they used because they only had one in a showroom.

 

Of course the injectors are still providing fuel while coasting, the engine is still running. The original ticket showed a DTC for a misfire, you should have felt that driving the car too. Do you have a scan tool to plug in and check for codes? If there are no codes it may very well be the way it is. These current cars are very sensitive to anything being wrong like a failed lifter, it will throw codes. After they drove it they showed no DTCs.

 

The car does have a fuel cutoff mode that may activate while coasting. I have seen on the forum some debate whether the so-called injector noise is actually the fuel injectors or the fuel injector pump. While fuel to the cylinders may cutoff during coating, I think (but I did not search throroughly) that the injector pump probably is still pumping to keep fuel pressure up.

 

The problem and misleading part of the shop manual there is "during an extended, high speed, closed throttle coast down". There is zero definition of those parameters. Is extended a 4 mile downhill section? Is high speed 90 MPH or 150 MPH? In normal driving it doesn't shut off fuel. Run one in manual mode and hit the rev limiter, you'll bounce your head off the steering wheel. The LT2 runs over 2,000 PSI of fuel pressure, those injectors tick pretty significantly.

 

i don't have a scanner but I can access one. I also never had any check engine lights. Not once.
I can feel it. It never did and still doesn't feel as fast as it should.

If it was the injectors the tick would be louder under acceleration. They do shut off when coasting. It's how you go from say 15mpg to 99mpg while at say 5k rpm for example. The injector excuse is pure BS imo.

Mostly, I'm worried this problem will become bad like it did before after i go out of warranty in a couple of months.

 

I don't think you're grasping how a fuel injector works. They have a constant pressure against them, in a direct injection system it's very high for precise metering(for the LT2 it's over 2,000PSI), the only thing that changes is opening duration of the injector. So when you see 99 MPG vs 15 MPG it's just how long they are open and we are talking milliseconds here. Don't even understand your warranty concern, drivetrain on a 2022 C8 is 5 years or 60k miles, you are no where close to being out of warranty. If you run a scan tool and there are no codes showing misfire or anything else, you're chasing ghosts at that point. Go to a dealer that has a SR on the lot and start it up with the hatch open. The injector tick at idle is clear and present.