I have a 2004 Silverado 5.3L and when I start the truck the engine knocks very loud. It is worse when it is cold out (30 Degrees or less). It normally goes away after a few miles or so but if I let it idle then it will last for 10 minutes or more. Also noticed that when I filled the coolent on a thursday up to the cold line I checked it again on saturday and it was about 2 inches below the cold line. No leaks on the ground and did not observe any milky substance in the oil. Dealer advised normal. I say hell no. And neither does my personal mechanic.
Sunday, March 11th, 2007 AT 5:57 AM