Join Date: Sep 2008
Location: Fruitland Park,Florida
If you paid $65 for a rebuilt opti, It was not rebuilt by GM, Delco, or Delphi. It is a Cheap China knockoff. You are the latest victim. A rebuilt genuine GM, Delco, or Delphi opti will cost over $300.
So ditch the junk and buy the real deal before it leaves you stranded. And being a lt1 owner, buy a $70 PC based oscilloscope. It is the only 100% way to testing the low & high resolution signals that opti sends out.
And buy a new opti to intake wiring pigtail. Pretty sure your old one is corroded & not making good contact.