EGR Valve or not???

[canyoncritter]

I have a Walker y-pipe in my garage that would have fit the OEM manifolds. The bung for the O2 sensor in the y-pipe is in the collector. So that made me think the O2 sensor in just one bank was a problem.

I don't know if this is a Fed or Cali Ranger. It started out life in Hawaii and was subsequently shipped to Colorado a few years later.

that could be your problem, I want to say on mine it was on the left side,about half way up the pipe between the y and the exuast man.

 

[HRTKD]

I ended up taking it to a shop and let them figure it out. They replaced the O2 sensor and the thermostat and it then just barely passed emissions. I'm not convinced that the JBA y-pipe isn't contributing to the problem since prior to the JBA headers it passed by quite a wide margin. But they didn't do anything about the y-pipe. It passed, so I'm not going to worry about it for the next two years. Hopefully I'll unload it within that time frame.