AFM Internal Gear Setting

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  • yitzac1990
    Noobie
    • Feb 2026
    • 12

    #1

    AFM Internal Gear Setting

    I was cleaning up my AFM and accidentally loosened the clip holding the large black gear in place. It did not move much, but not sure i got it back on the correct cog. Can anyone tell me which setting it needs to be at?

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    1991 325ix
  • noid
    E30 Mastermind
    • Feb 2008
    • 1530

    #2
    Follow this to get it back to factory:

    There is only one correct way to test an E30 AFM, and that's by using an oscilloscope. The most common mode of failure is the wearing of the carbon strip within the AFM. In simple terms, the AFM is one big variable resistor. It takes a +5V supply, and the carbon strip provides variable resistance
    Your resource to do-it-yourself and interesting bmw and e30 stuff: www.rtsauto.com

    Your resource to tools and tips: www.rtstools.com

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    • yitzac1990
      Noobie
      • Feb 2026
      • 12

      #3
      Perfect, thank you!!
      1991 325ix

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