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"Johnson Box"

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    "Johnson Box"

    I need some information on these bad boys. All I know is it was necessary for grey market cars being federalized. Just looking for some good info on how it works and if its necessary now.

    Any info would be appreciated.
    SO MUCH MORE TO DO!!
    IG: ohthejosh

    LEGIT CHECK ME BRUH
    BUYER FEEDBACK THREAD

    #2
    they were installed in lots of grey market cars during federalization in the 80s, along with single-wire O2 sensors. They are wired into the coolant temp sensor wiring, and use the O2 sensor signal as input to mess with the coolant temp signal to the ECU to trick it into running the car lean.

    they're safe to remove, smog guys these days barely know they existed. Just splice the coolant temp signal back together.
    cars beep boop

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      #3
      Sweet, Im ripping that crap out
      SO MUCH MORE TO DO!!
      IG: ohthejosh

      LEGIT CHECK ME BRUH
      BUYER FEEDBACK THREAD

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