[MIKEGOUGH1]

Okay, I have read all the posts on the diesel noise before the engine warms up on the 5.7. Mine does it as well, and it does not have to be very cold for it to do it. It is obvious that we have some very intelligent mechanical minds on the site by the posts submitted. That being the case, why can't we get a definite explanation as to why this is happening. All I see are possible explanations ranging from piston slap to overhead cams to timing chains. I had piston slap on my last Chevy, and it sounded much more destructive than the diesel sound I am getting. It would be really nice to know for sure what is causing this, and with as many trucks as there are with this problem(or issue), sooner or later we will get the honest, complete explanation. Once we do, then we are one step closer to a solution, if there is one. Is this a coverup, or does Toyota really not know what is causing it? It is a very annoying problem, and somewhat embarassing considering the price of these trucks.
To me, it does sound more like a valve train issue than a piston issue, but again that is my speculation.