So, I've always had some decent fuel smell from my truck since the TBI conversion. You know, that 'too rich' smell? I paid it no mind until I was washing the dishes a few weeks ago and had a thought. Could my AIR pump be introducing enough addition oxygen before the HO2 to make the PCM think that the engine was on the lean side? I spoke with a couple other TBI-conversion buddies on FSJnetwork and they thought I was onto something.

Has anyone else run into this? Babywag, you mentioned disabling the system so it can continue to pass a visual, if need be. I don't believe I can tune in the additional air so I need to remove it. Thoughts? I've poked around with it and can't fine a good, safe way to pretty much open the diverter valve up all the time.