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km16 · 04-11-2013, 11:29 PM

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.

04-11-2013, 11:29 PM	#10
km16 Registered User Join Date: Apr 2011 Location: Northeast Colorado Posts: 7	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.