knocking noise in the lower end of a 2.2 l

i got a 95 pontiac sunfire and it has a knocking noise from the lower end of the motor...could it be a bearing and is it possible to fix it with out pulling the motor out?

I have the same problem in my 94 RS.I was told it is either the timing chain guides or a spun bearing. Most likey you will have to pull the motor, it will make it easier. Is your motor down on power?If i am wrong please correct me. I also would like to know what my noise is.Hope this will help.

i put a new timing chain in so it cant be that...it has power just the higher the rpm get the louder the noise is i was thinking a bearing i was just hopin i could fix it with out pulling the motor