I know that someone posted about this a while ago. But I couldn't find the thread. I have more experience with the issue now than when I saw the original thread.

My problem is that when I have my foot on the go pedal and the engine gets up to between 3000 and 3500 rpm I hear a noise through the firewall right down near my feet on the drivers side that sounds like marbles hitting the firewall. I tried to solve this problem by putting premium in the truck. Sure enough, that got rid of the marbles sound. It switched to being a horrifying knock sound. (Horrifying for me at least since I don't want anything to happen that could kill my engine permanently). So right now I am running plus (to be in the middle of regular and premium) and it seems to have quieted down the marbles a little bit, but still not perfect.

Does anyone think that the Edge tuner I have on the way could have an effect on this problem? Or is there something more serious that I should have checked? I realize that these truck engines are not designed to be run out all the way through the RPM range, but sometimes I can't help it. And I don't want to feel like I'm sending the truck to death everytime my foot gets a little heavy. Please leave comments!

Thanks

 

probably need EGR cleaned. and the intake assembly flushed out with some carb,throttle body cleaner. and injectors flushed out. how many miles?

 

It can't be that. Because I JUST had the egr/intake cleaned out like two weeks ago at the dealership. The truck has 99,600 miles on it.

 

when i did my ignition upgrade my detonation went away all together.. u may just have a weakening coil pack or the wires need replacing. id replace the wires and plugs first see if it goes away.