Fault code 2-3-1 long term fuel trim part load

Discussion in 'General Motoring' started by rgarrett, Sep 16, 2005.

  1. rgarrett

    rgarrett Guest

    My '93 965 has been running a little rich for months. I have replaced the
    O2 sensor (out of spec), the AMM (out of spec), fixed a leaking vacuum line
    and swapped out the coil packs with my S90. The only fault code remaining
    is 2-3-1, indicating the fuel mixture is too rich or too lean. What tests
    should I perform before guessing the catalytic converter has been damaged by
    overheating due to the rich mixture? Thanks.
     
    rgarrett, Sep 16, 2005
    #1
  2. rgarrett

    Mike F Guest

    A bad convertor won't set that code. For the 2-3-1 code, you need to
    look at air mass meter, vacuum leaks, fuel pressure, leaking injectors,
    or injectors with a poor spray pattern.

    --
    Mike F.
    Thornhill (near Toronto), Ont.

    Replace tt with t (twice!) and remove parentheses to email me directly.
    (But I check the newsgroup more often than this email address.)
     
    Mike F, Sep 16, 2005
    #2
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