Originally Posted by 4x4blazerguy

Thanks for your post. Your the first one I have heard that explained my engine rattle problem for the last 60,000 miles+. I emailed you wanting any other info you have about this issue. Where is the balance shaft located?
Thanks a bunch for your post.

Originally Posted by swartlkk

If it is always from around 1800-2200RPM consistently, it is possible that this is resulting from torsional vibration in the balance shaft that is triggering the knock sensor, retarding timing and hindering performance.

This is documented in TSB 03-06-01-024.