try seafoam through the brake booster vaccum hose on the intake.

 

Did that already :-/. But I sold it to my roommate. I've pretty much accepted that it's a rod bearing that's about to go out or is already out. Putting in the lucas oil additive made it almost go away completely. So I'm pretty sure it's a rod knock.

 

Mine has a rod knock and lucas didn't do jack for it.

 

mine kinda sounds like that...If it doesnt hurt performence then dont worrie about it. I've got 233110 miles on my engine and I dont know how many others tore it up. I do know the timing belt was done at 215000. and cam sensor. ( other things too). I was so worried about that noise I droped the pan and changed no1 Cylinders connecting rod bearing with sealed power bearings and my old bearings are ok...I have pics but i cant post on here....If you'd like to see em ill email to you I also have a video on U-tube of them...so that noise isnt bearings...I think its rings...

 

Regardless. This thread is outdated anyway. Like I said, it's not my problem anymore. It's not my car. That car had more problems than that. I am now a proud owner of a 2005 SXT, and I couldn't be happier.

@Moparkyle: I put it in when my car was a quart low, instead of at the oil change. It made it quieter and I could barely hear it. But it returned a few days later. Probably just because it was a thicker oil. Or it was an upper knock. But I heard it from the oil pan, not the head.