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?

    Click image for larger version Name: 20260204_190735.jpg Views: 21 Size: 265.5 KB ID: 10155225

    Click image for larger version Name: 20260204_191316.jpg Views: 19 Size: 263.1 KB ID: 10155224
    Attached Files
    1991 325ix
    Tags: None
    • noid
      E30 Mastermind
      • Feb 2008
      • 1530
      #2
      Follow this to get it back to factory:

      How to test E30 Bosch AFM (Bench test) | RTS - Your Total BMW Enthusiast
      https://www.rtsauto.com/how-to-test-e30-bosch-afm-bench-test/
      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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