Strange Rattling Noise Upon Acceleration

[NC-Expy]

Anybody have any input on what you think this might be? It has progressively been getting louder the past few days and the more I hit the gas the quicker it "rattles". It sounds like little pieces of metal moving around in a tin can. It does not do it when it starts, idles, or coasts... only when I accelerate.

It sounds like it is coming from the very back of the engine bay on the driver's side.

 

[toms89]

What your describing sound like detonation.

I would check for loose plugs just to make sure your not about to launch one since this is common on these.

 

[toms89]

Posting a video with sound of course would help diagnose..

 

[NC-Expy]

I already tried. The exhaust covers up the sound and you can't hear anything.

 

[treycool94]

does it happen when you rev the engine?

 

[NC-Expy]

does it happen when you rev the engine?

No. Only when the truck is in motion and I am depressing the accelerator.

 

[BakerEdition]

Catalytic converter coming apart on the inside maybe...

 

[NC-Expy]

Catalytic converter coming apart on the inside maybe...

If it was a cat I feel like it would do it while sitting still? If it is, then that gives me another good excuse to go with a hi-flow cat kit.

 

[toms89]

Under load sounds like "pinging" or detonation.. A faulty egr could create this. When egr is working correctly it will raise the detonation threshold. The computer adds timing assuming a properly functioning egr.

But of course there are many possibilities and I cannot hear it so just guessing based on your description.

 

[JUST4FUN]

Heat sheald