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Old 10-16-2025, 08:08 PM   #1
monkeymehman
 
Drives: 2010 Chevolet Camaro SS
Join Date: Oct 2025
Location: Phoenix AZ
Posts: 4
Do I need an L99 Engine Replacement?

Hey everyone, first post on the forum so bare with me. I'll try to keep things concise.


I took my 2010 Camaro SS (Auto, with the L99) in to the shop to fix an array of Christmas lights that popped up on my dash. As a disclaimer, this new issue happened about 50 miles after I had just taken it in to replace my fuel tank to address a fuel leak engine code that I've had for months.


Anyways, they did a diagnostic, and said I have a dead cylinder, cylinder 4 to be exact. They did a compression test and it showed 50 psi. Without doing any other diagnostic, they said I need a brand new engine.


It seemed like they jumped the gun too quickly, so I did some research and found that the most likely cause of what is happening is a collapsed AFM Lifter. (Obviously we won't know for sure unless we take the head off, or run a borescope inspection.)


Anyways, I decided to get a 2nd opinion from another shop. This shop performed the same diagnostic, (this time cylinder 4 showed 95 psi on the compression test), and came back to me with the same conclusion.


My question is, do I really need a brand new engine, or could this be fixed by replacing the head / camshaft? Again, without taking the engine apart, we won't know for sure. I guess I'm just asking, is it possible to ONLY need a head / cam job? Or is my ONLY solution, to buy a brand new engine?


Any help would be appreciated. Feel free to ask any clarifying questions if I missed anything.


Thanks
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