Hello!
I’m kinda worried about knocking while accelerating.
I have M113 engine, 2006, 69K mi currently.

I can’t hear same sound when I put gear on P or N. No knocking when I revving, only hearable under D acceleration. Hearable between 1300-2000 RPM, and it is hard to hear from over 2500rpm or 40mph because of road noise.
Oil changed in stealership this month.
No idea whats going on.

heres two video,

One is knocking and one is idle sound.

Knock:



Idle:


Any idea where should I check?
Valve cover gasket and breather case is leaking but Im not sure this caused this sound.

 

I don't hear a pronounced knock, but I would consider checking the serpentine belt, idler and other pulleys to cut down the front end noise. Scan to check there isn't a misfire. Also, sometimes faculty motor mounts can contribute to what feels like a misfire.

 

Thank you for the answer! If you turn up volume to max, you can hear something is hitting when rpm goes up. Mounts are checked, luckily they are still stable!