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  1. Exhaust Tech
    For sometime now I have been repeatedly getting a P0171 and P0174 codes running lean conditions there is no leaks that I have been able to trace down then I started getting a cylinder eight misfire replaced all the plugs and cylinder eight ignition coil. Cleaned the MAF bought two new oxygen...
  2. Intake/Fuel Tech
    Hello Board, I have been receiving the above mentioned codes randomly for the past few months although they seem to be getting a little more common place. The codes are either together or is only the P0171 Code They only appear at start up or when idling Here are my engine mods: VCM...
  3. V8 Engine Tech (L76/LS3)
    I've had rotofab, ARH headers, and custom VMS tune for 6months+ and no issues - now I get the following all of a sudden: P0131 - 02 Sensor circuit low voltage P0171 - system too lean (bank1) P1133 - HO2S Insufficient switching Checked rotofab closely for cracks or loose connections and...
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