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Message: <blockquote data-quote="Patientzero" data-source="post: 1456064" data-attributes="member: 22964">Now that the car was back together it was finally time to get back on the track.  It had been almost a year since the last time I ran the car.  But, sometimes no matter how ready you think you are, the universe has other plans.I was signed up to run SCCA autocross but the week before the car starts running like crap and I notice the O2 sensor had stopped working.  I ordered a new sensor that arrived just in time for the event.  It didn't work either.  Not wanting to risk hurting the car and not wanting to waste the money I had already paid, I ran my brand new Ford Fusion that had just gone over 1000miles.[ATTACH=full]2676[/ATTACH] It didn't do too bad either![ATTACH=full]2675[/ATTACH] I started talking to Holley about the issue I was having with my HP.  They sent me another new oxygen sensor that also did not help.  Holley ended up sending me a loaner ECU to take that out of the equation.  With the loaner ECU the problem was fixed immediately.  All the "bad" 02 sensors worked too.  The problem was in the ECU.  I sent it in so they could test it.  After bench testing they claim that it worked fine and the 02 sensor read correctly.  I got it back and tried it in the car, same shit.  After going back and forth with Holley for the next couple weeks they tell me that there is nothing they can(are willing) to do because my HP was out of warranty but they offered me a small discount on a new one.  A $1300 dollar ecu isn't something I expected to have to replace after 2 years.[ATTACH=full]2677[/ATTACH] My ECU still worked completely fine other than the O2 sensor driver had failed.  This meant I couldn't use closed loop, something the Holley is very good at.  I didn't feel like dishing out another grand for a new ecu so I decided to improvise.  At this point I still had the loaner ecu so I put a secondary wideband in the car and fed the signal into the Holley so I could at least monitor my AFR's.  I had this older AEM wideband that I was using in my '79 C10 that was just sitting around. [ATTACH=full]2671[/ATTACH]  At some point I lost the backing plate.  Not a problem, I have a 3d printer so I drew a new one up in Fusion 360 and hit print. VOILE![ATTACH=full]2674[/ATTACH] [ATTACH=full]2673[/ATTACH] [ATTACH=full]2672[/ATTACH]</blockquote>