I have a knocking 6.2 . It has been knocking for about a year now, I always thought it was an injector but I am not sure. recently the knock has gotten louder so I went to a stanadyne service shop with my truck and the whole time I was there it did not knock, but of course I got home and it was knocking again. I will try to explain the symptoms. When I start the truck when it has been sitting for a while, the knocking is not immediate as the engine starts, the knocking only apears after the engine has been running a few seconds, almost as if when pressure builds up either in the lubrication system or in the injection system. Also the knock apears to sound worse when the fast idle is on , but could just be because the engine is turning faster that it would apear that way. also it is a bit quieter once it has warmed up a bit. :help: What could this be?