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air fuel ratio

  1. access port and front o2 sensor

    Tuning: Electronic Engine Management
    ok I am new but hear me out. I have headers and uppipe and the front o2 sensor will not screw in properly due to oversizing of the up pipe. evedently the o2 sensor tip rests against the piping? does this make sense? Anyways I had this done when i replaced my motor... another story... Damn...
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