Quote:
Originally Posted by Rock-It Man
I went through the noisy lifter thing with my 2010. The AFM lifters were replaced under warranty with an upgraded design. I'm not sure when the better lifters came into production. Maybe other 2013 owners can chime in.
This was the AFM lifter bleed down problem that caused a rattle for a second after startup. That's gone now, but still the L99 is generally noisy compared to earlier GM small blocks.
My 2010 is absolutely stock. I have to think it's a rare one for that reason but also because of the combination of options that I ordered. It's 2SS but non-RS. So it has a leather interior and gage cluster, but standard headlights and white SS badges. I ordered it that way primarily because in 2010, only non-RS cars had real fog lights. In RS cars, the "fog lights" were the DRLs and could not be turned on once the headlights went on. Later, GM came to their senses on that particular issue and moved the DRL function to the headlamps on RS cars.
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The OP's car is a 2013 so it should have the updated lifter design I thought GM changed them in the 2011 models but I'm not sure on that one.
Hopefully he gets it sorted but with no mods to the car it shouldn't be much of a fight. Mine is unmolested except for the tune so it appears stock in every way including the air box but of course it really isn't stock anymore....