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What is "fuel system 2" and why CL-Fault?

Discussion in '80-Series Tech' started by cmtierney, May 17, 2007.

  1. cmtierney


    Likes Received:
    Dec 15, 2004
    Land of Fruits, Flakes, and Nuts
    I pulled the codes from my 95 (OBDII) LC. It read P0170 Fuel Trim Malfunction Bank 1. This started shortly after the head gasket was replaced. The mechanic that did the HG replace pulled the codes and recommended to replace O2 Sensor (Front) which I did. It obviously didn't help.

    Freeze Frame info:
    Fuel Sys 1: CL
    Fuel Sys 2: CL-Fault
    Calc Load (%): 12.55
    ECT (degF): 192
    STFT B1(%): 8.59
    LTFT B1(%): 27.34
    Eng RPM: 640
    Veh Speed: 0
    IAT (degF): 87

    Since it looks like it's indicating "Lean", I'm looking for a vacuum leak. But why is Fuel System 1 in closed loop ops (and apparently okay) and Fuel System 2 seems to have a CL fault?

    What is the difference between Fuel System 1 and Fuel System 2?