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  1. #11

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    Definately try new o-2 sensors, that's where most of the problems are. They give incorrect readings, and change your fuel mapping, and give even worse fuel mapping with reading the wrong readings.
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  2. #12

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    What O2 sensors are best for our trucks? AC Delco, Delphi, Etc.? What ones affect the gas mileage most, upstream or down?
    Last edited by palmer_df0130; 04-07-2012 at 07:35 PM.

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