Originally Posted by toyomoho
The VVTi oil screen could need cleaning. This changes the intake cam timing. Location is the VVTi solenoid area.
Something with the engine oil filter causing lack of oil at times.
Worn cam/crank timing chain adjuster causing chain rattling. Location is under timing chain cover firewall side of engine.
Bad serpentine belt idler.
Use a section of hose as a stethoscope to narrow down the noise.
If you're looking at the engine from the front it sounds like the noise is coming from behind the top left of the valve cover. I'll try to use the hose method. I wondered if it might be that baffle issue on the intake manifold also.