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Discussion Starter #1 (Edited)
Was wondering if Holley's changed something with the setup of the O2s.My last set was NTKs with a real short wire. And always stayed close to even on the charts. Always a little difference but real close. And when you shut it down one rested at 27.1 and the other was 27.3. Now just bought a new set since my last set had 2 seasons on them and were showing slo on the LCD screen to react. My new set has this super long cable like the Bosch and resting one shows 27.9 and the other is 30.1. And when running there always a full point to a point in a half off were it was starting to move my fuel table and richen it up to make up for the one side reading 12.9 were it should be and the other at like 13.9 to 14.2. So I had a spare set of Bosch's and put them in and they read like the old ones 12.9 to 13 right and left. But know they won't last with the race fuel and nitrous. Is it possible the one reading leaner is just bad.
 

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Did you try swapping the 2 new sensors?
Air leak?
 
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