Hey everyone. I have a 1999 es300 with around 318,000 miles. Recently it has been making a pretty bad knocking sound on the output side of the engine, towards the top. I'm plan to tear down the engine to try and find the problem, but I though I'd try and see if any of y'all had any better ideas of what specifically it might be before I did that. I attached an audio clip of the engine running and revving.

Also, is the link to the video source of that audio clip on Youtube.

Let me know your thoughts/recommendations on what might be causing it. Thank you!

 

First impression is timing belt noise.

 

Yes, I agree. When did you last change the timing belt and (importantly) the timing belt tensioner?

 

I got her at 236k miles and I have never changed the belt or any of its components. I checked the carfax service report and there is no mention of a timing belt replacement anywhere, so I assume it's way past it's expected lifespan. I'll probably pick up a kit from Napa this weekend and change the timing belt, tensioner, and water pump.

 

 

Dont get NAPA stuff, water pump especially. Can pick up OEM from Rockauto.

 

Can do, RockAuto it is then.

 

or go to the dealer and tell them you work for a competing dealer. (make sure its not the same owner) and they will give you whole sale price. Typically 20% less that ticket price.