mattri

I've owned many Subarus over the years, just now found this site. Looking at a 93 Loyale 4WD 5spd 200K+ miles. I'm going to look at the car tomorrow. The owner says it has started to make a knocking type noise when accelerating. They are from Alaska and just moved down here. If it's just under load that makes me think detonation. How can I tell if it just needs to be timed or if it has a rod going? Thanks, Matt.