Scion tC engine tapping or knocking noise

Update: There is apparently a TSB by Toyota in Aug 2011 about a defective piston assembly which causes excessive oil consumption for 07-09 tC's and affected xB2 with the same 2AZ-FE engine as us. 55k Miles on this 2008 Scion tC. Regular oil change intervals and never let the oil go low. Never had any issues before but on this last interval I noticed this unnerving tapping or knocking noise which seems to be coming from the upper end of the engine.

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How I fixed my KNOCKING and PINGING engine for $7 dollars!
Replacing an engine is scary. You might as well replace the whole car. (depending on how old your car is) Here is how I stopped the knocking issue with my engine. Thanks goodness it worked. *NOTE: This is a temporary solution. You want to have a mechanic look over your vehicle for further diagnosis. ----- DISCLAIMER: All content provided on this channel is for informational purposes only. The owner of this channel makes no representations as to the accuracy or completeness of any information on this site or found by following any link on this site. The owner will not be liable for any errors or omissions in this information nor for the availability of this information. To Serve Men, the owner, or Associated partners will not be liable for any losses, injuries, or damages from the display or use of this information.

Scion tC 3.3L V6 Conversion A list of answers for questions that people ask most often can be found in the thread for Scionlife. I tried to post it here, but it's too long. Thanks...

1994 Nissan 300zx Engine Noise /Knocking (fixed)
1994 Nissan 300zx 2+2 N/A Engine noise/Engine knocking. I started to hear it one day after work. So far I have searched and asked a few people, getting mixed reviews. I have: Put in Lucas Heavy Duty Oil Stabilizer - Did nothing Changed the oil - No change Did a compression test in each valve - All stated at the same pressure Replaced spark plugs - No change (the ones I replaced seemed like they didn't burn) I am currently stuck :| -=-=-=-Fixed-=---=-- Found out the timing belt was way off and the auto Tensioner was not working properly. The belt was fine so we just reused it. Cleaned the auto Tensioner and re-positioned the valves, put it it back and it ran smooth. Leaving this video to others. Maybe someone had a problem and at least this could be a start.