L99 lifter start up noise

[Rock-It Man]

Originally Posted by baby02

It has nothing to do with AFM. There was a tech bulletin for the 2010 models, it probably still covered, If the noise is during a cold start-up.

It has everything to do with AFM. The way AFM works is that 4 cylinders have collapsing lifters. When oil pressure to these is cut off, they collapse and the valves stay closed.

The lifters are supposed to stay pressurized when the engine is off, but the early design was prone to bleed down, causing the clicking on start up.

An improved design prevents bleed down.

[td2222]

I have taken my 2010 SS to the dealer and left it for weeks during the warranty period they clamed to hear nothing at start up. It happens mostly after sitting for a while. They wrote notes and said if it happened even after the warranty was up they would take care of it. I even gave then a video with the noise and they said it wasn't definitive so they could do nothing.
Now the warranty has expired, it is still annoying. Will take it back and see if the story changes.
I have had GM rides most of my life, that may change soon.
A lifter noise not the most expensive repair in history but wasn't my expense to pay. May become my problem. Come on GM, too many friends have gone to the Foreign Isle don't send me there!

[GM-ACE]

Originally Posted by WE485

I have talked to GM many times. I have also contacted two other dealers. both of them said they would look into it, but never called me back.

Which dealers? Which one did you buy it from? You usually have better luck with the one you buy from, but not always. I have the same issue with mine and I'll be taking it in to the dealer I used to work for- Valmark Chevy in New Braunfels.