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  1. #1

    Default missing at high speed

    I just got the code from my diagnostic plug. It reads 44. Does anyone have a code book or know what this code is? I have a 94 chevy p/u with 306,800 miles on it. Does an oxygen sensor cause this? Thanks

  2. #2

    Default

    Quote Originally Posted by Dons31a View Post
    I just got the code from my diagnostic plug. It reads 44. Does anyone have a code book or know what this code is? I have a 94 chevy p/u with 306,800 miles on it. Does an oxygen sensor cause this? Thanks
    Trouble Code...44... indicates that the O2 sensor is showing a persistently high exhaust oxygen content (lean), despite the efforts of the ECM to increase injector on-time (thus increasing fuel delivered).

    The conditions for setting this code are:

    • no Code 33 or Code 34 (MAF Error) present, and
    • the O2 sensor voltage remains below 250 mVolts, and
    • the ECM is in Closed Loop control, and
    • the above conditions exist for more than 50 seconds.


    Typical causes for this code include:
    1) O2 sensor defective or lead shorted
    2) Lean injectors (dirty or blocked)
    3) Water in fuel
    4) Exhaust leaks upstream of O2 sensor
    5) Fuel pressure or volume too low
    6) MAF sensor reading lower airflow than is actually present
    7) Vacuum leaks
    8) Incorrect or poorly calibrated PROM

    MIKE


    99"SILVERADO
    5.3 l 3.73 l G80
    BLACK BEAR CUSTOM TUNE
    SNUGTOP l COLORMATCH l KATZKIN










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