I have a 2008 Scion tC RS 4.0 with 77k miles. I am the 2nd owner bought the car with 68k. 5spd Manaual.

About 3 days ago, I started hearing a very faint knocking noise coming from the bottom end,. And I mean faint. I panicked and cant get this off my mind and need some help/advice. I have taken a video for you to listen.

I know the VVTI engines are well known for loud valvetrain but once I heard the little knock on the bottom end its got me worried Its not the ticking noise Im concerned about its the noise I hear when I put the camera towards the bottom end.
I still owe money on the car and this would not be good news. Only modifications I have done is Flowmaster DBX exhaust and TRD CAI which I converted to SRI and Coilovers.

I have driven the car hard since I got it I have street raced a little bit but mostly just shifting at higher rpms. I love the sound of the exhaust and engine and I was shifting around 4k-5k RPM (mostly 4k) I have been driving a stick since I was 16.
I use Mobil 1 5w20 Full synthetic. When I bought the car I dont know how the previous owner drove her. I automatically switched the car to full SYN when I got it.

Please take a look at my video and chime in on anything unusual that you may here. I appreciate your time.

 

Is it possible this is my Waterpump? When I got the car, It was full on antifreeze, 3 months later it was down I would say 2 cups or so, However I dont see any leaks.

 

It's not ur water pump. I had the same problem w my tc and it's turboed w/built bottom end. It started out to b a lil ticking noise but when u rev it up a bit the ticking gets louder and faster, coming to find out I spun a rod bearing and scored cylinder 2. U may wanna take it to a performance place and have them look at it cuz, it deff sounds like a spun rod bearing

 

Well I found another engine on the web with 56,000 miles, Just has a broken timing cover which I will swap from my old engine. Payed 1500 for it coming next week got an appointment with the shop to install going to charge me 1400 to swap, so all in all about 2900 repair Donor motor coming from a 2007 TC. Thanks for everyones response.

 

$500 more and I got a rebuilt engine with a 6 month warranty. Hope your swap goes well.

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