Good day,
This is my first post to this forum. I am usually on vintage forums. I have a 62 C10 I am building but unfortunately my 2018 Silverado 5.3 liter V8 101,853 miles on it. The truck started making this noise yesterday. I drove it 5 miles and started hearing this noise when I parked. I took off the three belts and it still made the noise. I listened to all the pulleys with a stethoscope and can not pin point the noise.
I read online there seems to be a problem with collapsing lifters in these engines, is this the noise? See the video below.
If so how do I test what side the bad lifter is on? is there even a way?
I scanned for codes but there were none that said misfires. only codes present were for the UI user interface/radio screen and the tires tpms.

What else should I check? I do not want to go blindly taking the top half of the engine off on a presumption.

Thank you for any advice

sorry only noise and no video image. i converted an mp4 to mp3 to get the noise. I was standing on driver side in front of wheel when recording

 

Has this post been seen? Or is there not much active members in this forum?
Hoping to get a answer. If this forum is not for bouncing around ideas on issues can someone recommend a forum that does

 

I for one saw it Friday, and just listened to the audio today. I just don't have any personal experience with an engine that was making sounds like that. It does sound like valve lifter noise I hear on several Youtube videos I just pulled up, but not as fast. That may imply only 1 failed lifter at this point, versus multiples.

If you've been driving 101k miles with the AFM feature enabled, you are ripe to be experiencing lifter failures. I would think your stethoscope should be placed on valve covers to isolate which side of the engine the lifter noise is coming from, but I could be wrong. I don't see placing it on the pulleys on the front of the engine helping, as the failure is at the top of the lifter, or so I thought, due to insufficient lubrication when AFM disables cylinders.

If and when you get it diagnosed and fixed, I would advise purchasing some kind of AFM disabler, and plugging it into the ODB2 port. If I ever buy a newer Chevrolet truck with that "feature", you can be sure that is the first thing I will do.

 

Thank you so much for the feedback. I just wanted to confirm what my suspicions were. I've heard there's an ongoing lawsuit against GM over these lifters and I need to have a paper trail, so unfortunately I think I'm going to tow it to the dealer and have them confirm it's the lifter and then do the work myself after it's done. I build old cars all the time so I don't think this is too complicated just want to get paid back whenever GM recognizes this as a recall.
Thank you for the time listening to the noise and giving me your suggestions. I was thinking I just deleting the AFM set up completely when I fix it.
Much appreciated

 

Unfortunately, not sure they pay back DIY folks in these type cases. And it's pretty much a pull the engine and rebuild type level of effort, if I understand it, to replace the lifters. I say that not having considered or looked into doing it myself. If you do go that route, do ALL the lifters, and do an AFM-delete while at it. I know most folks who go this route outside the dealership delete the AFM feature during the engine work.

I say this having not had any experience at dealing with this type stuff since I rebuilt a 1971 Toyota 1.6L engine, replacing the valves and valve springs, and that engine used push-rods to lift the valves (no overhead cam).

 

Thank you... Yeah it is about 30 or so hours of work. The engine does not need to be pulled but the top half and front will be fully disassembled. You are able to slide the cam out the front.
I heard from the lawyers website that is leading the law suit that it will be harder to get GM to pay you back but possible if you have a clear trail of paper work.
Who the heck has 6 grand to pay a dealer to change one lifter and it will have no warranty after 90 days.
SMH.
Lol I am only 1000 miles pass the power train warranty. Bad timing.
Thank you for your advice

 

Glad to know it can be done without lifting the engine out. I do a lot in my garage, and could probably tackle it if I had to, based on what you say.

Sometimes I've seen folks call GM Corporate and get this type issue covered under warranty coverage, if you are only 1000 miles out of warranty. I would certainly try it, if the dealer agrees that it is a lifter. Better for them than having you tacked onto the lawsuit...

If you do it yourself, I would replace all the lifters while the engine is apart, and do the AFM delete.

Issues like this AFM stuff are why I tell my wife I keep hanging onto the two old trucks still in my driveway... other than the intake manifold gasket (twice) on the 1996, they've been pretty problem free, at 203k for the 1996, and 135k for the 2006.