Is that a single wire 02 sensor? Try it anyway, won't hurt anything as far as I know. If you want to talk to somebody else and get a fresh point of view, that's ok.
You can fool the computer to think rich or lean, then see if it makes any difference. You can take the 02 sensor connector loose, if you need to, use a jumper for the purple wire that goes to the computer side of connector, hold one end of bare wire in your hand, with the other hand touch the positive battery post, engine cranking, see if it makes any difference. Then touch the negative battery post, try again, any difference? Just speaking for myself, it's hard to diagnose these issues over the internet.
Wednesday, October 6th, 2010 AT 3:17 PM