I have a 2001 Hyundai Tiburon and it has started making a knocking noise while accelerating. It's not like it stays constant. It seems to have more to do with engine load than rpm. So I can be at 3k and get some noise then it stops...push the pedal down a little more and it comes back. The best way to try and hear it is to rev up and down while accelerating. I took 1 quart of oil out tonight and replaced it with lucas engine treatment and a little seafoam. I notice the oil was kinda metallic...that sounds like a bad thing! Could it be a rod bearing? If so, couldn't I just change it through the bottom of the engine?



Videos showing the symptoms:



Oil glitter (big "particles" are air bubbles. Actual metal was so fine my paint strainger wouldn't filter it out!):

https://photos.app.goo.gl/XVft2PIoCL5yGAYJ2



Parked with hood open (obvious!!):

https://photos.app.goo.gl/GsKOxv4YoUhs1K8k1



Driving (not as noticable):

https://photos.app.goo.gl/e6BV2FJrafo5qvWk2

 

I have really bad speakers here at work, but sounds a bit like a stretched cam chain?

 

Do you have a CEL?



Have you ever replace the Knock Sensor?

 

No CEL. Have never changed the knock sensor.

 

sounds like big end (rod bearings as you call them) to me, might have damaged the crank aswell. You won't really know until you drop them off and have a look for other damage

 

9bC1UNC.jpg



buy a motor from the junkyard. they are cheap enough.



dont waste your time rebuilding this one.

 

You may be able to get by with just replacing the rod and crank bearings with the engine in the car provided the crank isn't damaged.