onsight

-study- thanks for idea, I will try clean the rust first using drill. then put some real torque hope I wouldn't brake it. just tired of drilling and tapping.

I tried torch this afternoon, still can't move the nut. I really suspect if that nut is welded to exhust. I looked close, from every possible angel, all seems like welded. are you sure that nut is part of oxygen sensor?

thanks for clearing my confusion. now I got to face that nut, so painful torch is out of my ability. any other suggestion on next move I can take besides more WD-40?

I am trying to replace the old Oxygen sensor on my 94LE pathy, is it the one in this picture? I can't figure out how to screw the old one out. seems in red circle it's a 22mm nut. but looks like it's one whole piece with the muffler. or just because there's too much rust? I applied lots of WD-40, doesn't help. could someone tell me whether is should be separate from the muffler, the red, blue or green circle? thanks very much

thanks guys, really helpful, i'll check those ideas this weekend

94 Pathy LE want to invest on a set of MSD 8.5mm silc spark wires, and 6 NGK Irdium. seems I also need to get a MSD ignition booster to work with that wireset. anyone has experience on this. like which website is cheap on MSD wires, or do I need to made them by myself? b.t.w. I can not find the toolkit which should be under back seat. so any idea on where i can get that custom spark plug socket for cylinder 6?