help!!!

Discussion in 'The Garage' started by Guss, Sep 21, 2005.

  1. Guss

    Guss Registered Member

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    can someone tell me what closed loop is did a search and have an idea but not sure nothing raly explains.
     
  2. Russell

    Russell LLY Escalade Status Premium Member GMOTM Winner

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    Closed loop is when the 02 sensor gets hot enough to send a reading to the ECM, for it to base its air / fuel ratio on :)

    Open loop is before the 02 sensor is hot enough to send a reading up.
     

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