ok u can hear it in the video. this is wuts going on when i rev my engine it will feel and sound like something hits and i dont know wut it could be. it only does it when i rev it hard like a full pedal rev. but wont do it when im driving and i punch it. its hard to hear in the video but im sure you will catch on to it.


http://www.youtube.com/watch?v=oE6QimjBewk

 

I didn't hear anything, aside from some wind noise..... truck sounds good.... is it a solid thunk? Or similar? If so, check the motor mounts, and the rear trans mount.

 

Sounds like a backfire to me.

HeyYou, if you listen @ 12 seconds, i believe that's what he's concerned with.

 

really does sound like the exhaust , when you rev like that and go off throttle the fuel trim goes rich and the unburned fuel partially ignites downstream in the exhaust, thats what your hearing. its more obvious with aftermarket exhaust and usually happens off throttle.

 

Yep, sounds alot like a normal rev in neural, or a downshift while rolling.

 

Did it do that before you got rid of the cat? It doesn't sound like anythings wrong to me.