Re: 5.3 knocks when warmed up
I have a 2006 Silverado with the 5.3 with 70000 miles that had similar symptoms. It would only knock once warmed up. I put 30000 miles on with it running fine just with a knock. I finally pulled the pan, looking up at it you could see that one of the lifters had gone out and it had wore the cam lobe bad.
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