fuel trim

  1. L

    Fuel trim running negative

    I have been posting lately regarding my Cat. and O2 sensor issues, while the mechanic did the diagnostic, he also noticed negative fuel trim, I think this means my truck is running too rich based on my research of this subject, is this something critical that I need him to trace the problem or...
  2. S

    Torque Pro or OBD2 scanner data logging

    I am preparing to install a TRD SuperCharger on my 2000 LC. Bought a OBD2 scanner and I am using Torque Pro to monitor/log data. Any advise on what/how to monitor specifically to identify any existing issues with the engine/fuel system that might be aggravated by a SC? I have been monitoring...
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