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SomeGeoffGuy · 07-21-2021, 10:51 PM

I had a metallic squeak and it was the AFM exhaust valves needing lubrication. It happened when stopping, starting, and turning - although I believe it happens when turning because I was letting off the gas and the valve activated. There is a GM brand dry lubricant that you can spray into the valves and the metallic squeak goes away. I think there is even a service bulletin but I don't have it handy.

-Geoff

07-21-2021, 10:51 PM	#3
SomeGeoffGuy Drives: 2023 2SS Convertible Join Date: May 2009 Location: Metro Detroit Posts: 1,061	I had a metallic squeak and it was the AFM exhaust valves needing lubrication. It happened when stopping, starting, and turning - although I believe it happens when turning because I was letting off the gas and the valve activated. There is a GM brand dry lubricant that you can spray into the valves and the metallic squeak goes away. I think there is even a service bulletin but I don't have it handy. -Geoff __________________ '12 2SS RS Convertible - Traded in. '16 2SS Convertible - White on white, mag-ride, NPP, nav. Sold! '23 2SS Convertible -Same as above except orange.