Originally Posted by oemtech
Banks makes a very good system... But, the ROI is pretty low in my opinion.
One other thing, on a gasser the O2 sensors are relocated and there is no reclaibration of the ECM to compensate for this. In the 2 cases I have been involved with one O2 sensor is off as much a 5" down stream from the opposite O2 sensor. What you will see on a scan is an imbalance of the fuel trims between the right and left side of the engine. The only way to fix it is to weld a new O2 bung in the proper place recalibrate the system.
Dale, I am so glad I found your post !!! and hope you can help me.
I did installed the full Banks kit on my 8.1, 2004 Winnebago. I was very happy with the increase in power, no increase in fuel economy. But last year I started to have the "engine light" come on and loosing power.
I had a Workhorse certified shop check it and found out that the catalytic converters are damaged and he told me that just what you said , that the o2 sensors were relocated and causing the problem. Banks agrees that the sensors were relocated , but not enough to cause a problem. Workhorse will not warranty the cats because I have modified the system with the Banks. I am able to clear the codes and will run fine until the next big hill. I always have the engine light come on when going uphill and under load, it does not heat up. I had the fuel pump checked and it is okay. The scan always tells me "low voltage to the O2 sensors" both sensors.
Could you please give more information on relocating the sensors, anybody that will do that job here in California ? And how do I properly recalibrate the system?
Thank you, Pete